1178 lines
36 KiB
Python
1178 lines
36 KiB
Python
from __future__ import annotations
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from datetime import timedelta
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import operator
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from typing import (
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TYPE_CHECKING,
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cast,
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)
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import numpy as np
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from pandas._libs import (
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lib,
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tslibs,
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)
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from pandas._libs.tslibs import (
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NaT,
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NaTType,
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Tick,
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Timedelta,
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astype_overflowsafe,
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get_supported_dtype,
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iNaT,
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is_supported_dtype,
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periods_per_second,
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)
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from pandas._libs.tslibs.conversion import cast_from_unit_vectorized
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from pandas._libs.tslibs.fields import (
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get_timedelta_days,
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get_timedelta_field,
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)
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from pandas._libs.tslibs.timedeltas import (
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array_to_timedelta64,
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floordiv_object_array,
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ints_to_pytimedelta,
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parse_timedelta_unit,
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truediv_object_array,
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)
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from pandas.compat.numpy import function as nv
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from pandas.util._validators import validate_endpoints
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from pandas.core.dtypes.common import (
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TD64NS_DTYPE,
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is_float_dtype,
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is_integer_dtype,
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is_object_dtype,
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is_scalar,
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is_string_dtype,
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pandas_dtype,
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)
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from pandas.core.dtypes.dtypes import ExtensionDtype
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from pandas.core.dtypes.missing import isna
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from pandas.core import (
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nanops,
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roperator,
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)
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from pandas.core.array_algos import datetimelike_accumulations
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from pandas.core.arrays import datetimelike as dtl
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from pandas.core.arrays._ranges import generate_regular_range
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import pandas.core.common as com
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from pandas.core.ops.common import unpack_zerodim_and_defer
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if TYPE_CHECKING:
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from collections.abc import Iterator
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from pandas._typing import (
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AxisInt,
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DateTimeErrorChoices,
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DtypeObj,
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NpDtype,
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Self,
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npt,
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)
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from pandas import DataFrame
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import textwrap
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def _field_accessor(name: str, alias: str, docstring: str):
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def f(self) -> np.ndarray:
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values = self.asi8
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if alias == "days":
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result = get_timedelta_days(values, reso=self._creso)
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else:
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# error: Incompatible types in assignment (
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# expression has type "ndarray[Any, dtype[signedinteger[_32Bit]]]",
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# variable has type "ndarray[Any, dtype[signedinteger[_64Bit]]]
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result = get_timedelta_field(values, alias, reso=self._creso) # type: ignore[assignment]
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if self._hasna:
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result = self._maybe_mask_results(
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result, fill_value=None, convert="float64"
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)
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return result
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f.__name__ = name
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f.__doc__ = f"\n{docstring}\n"
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return property(f)
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class TimedeltaArray(dtl.TimelikeOps):
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"""
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Pandas ExtensionArray for timedelta data.
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.. warning::
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TimedeltaArray is currently experimental, and its API may change
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without warning. In particular, :attr:`TimedeltaArray.dtype` is
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expected to change to be an instance of an ``ExtensionDtype``
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subclass.
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Parameters
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----------
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values : array-like
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The timedelta data.
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dtype : numpy.dtype
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Currently, only ``numpy.dtype("timedelta64[ns]")`` is accepted.
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freq : Offset, optional
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copy : bool, default False
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Whether to copy the underlying array of data.
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Attributes
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----------
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None
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Methods
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-------
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None
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Examples
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--------
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>>> pd.arrays.TimedeltaArray._from_sequence(pd.TimedeltaIndex(['1h', '2h']))
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<TimedeltaArray>
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['0 days 01:00:00', '0 days 02:00:00']
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Length: 2, dtype: timedelta64[ns]
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"""
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_typ = "timedeltaarray"
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_internal_fill_value = np.timedelta64("NaT", "ns")
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_recognized_scalars = (timedelta, np.timedelta64, Tick)
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_is_recognized_dtype = lambda x: lib.is_np_dtype(x, "m")
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_infer_matches = ("timedelta", "timedelta64")
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@property
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def _scalar_type(self) -> type[Timedelta]:
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return Timedelta
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__array_priority__ = 1000
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# define my properties & methods for delegation
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_other_ops: list[str] = []
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_bool_ops: list[str] = []
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_object_ops: list[str] = ["freq"]
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_field_ops: list[str] = ["days", "seconds", "microseconds", "nanoseconds"]
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_datetimelike_ops: list[str] = _field_ops + _object_ops + _bool_ops + ["unit"]
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_datetimelike_methods: list[str] = [
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"to_pytimedelta",
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"total_seconds",
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"round",
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"floor",
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"ceil",
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"as_unit",
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]
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# Note: ndim must be defined to ensure NaT.__richcmp__(TimedeltaArray)
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# operates pointwise.
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def _box_func(self, x: np.timedelta64) -> Timedelta | NaTType:
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y = x.view("i8")
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if y == NaT._value:
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return NaT
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return Timedelta._from_value_and_reso(y, reso=self._creso)
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@property
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# error: Return type "dtype" of "dtype" incompatible with return type
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# "ExtensionDtype" in supertype "ExtensionArray"
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def dtype(self) -> np.dtype[np.timedelta64]: # type: ignore[override]
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"""
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The dtype for the TimedeltaArray.
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.. warning::
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A future version of pandas will change dtype to be an instance
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of a :class:`pandas.api.extensions.ExtensionDtype` subclass,
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not a ``numpy.dtype``.
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Returns
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-------
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numpy.dtype
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"""
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return self._ndarray.dtype
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# ----------------------------------------------------------------
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# Constructors
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_freq = None
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_default_dtype = TD64NS_DTYPE # used in TimeLikeOps.__init__
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@classmethod
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def _validate_dtype(cls, values, dtype):
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# used in TimeLikeOps.__init__
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dtype = _validate_td64_dtype(dtype)
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_validate_td64_dtype(values.dtype)
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if dtype != values.dtype:
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raise ValueError("Values resolution does not match dtype.")
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return dtype
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# error: Signature of "_simple_new" incompatible with supertype "NDArrayBacked"
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@classmethod
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def _simple_new( # type: ignore[override]
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cls,
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values: npt.NDArray[np.timedelta64],
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freq: Tick | None = None,
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dtype: np.dtype[np.timedelta64] = TD64NS_DTYPE,
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) -> Self:
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# Require td64 dtype, not unit-less, matching values.dtype
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assert lib.is_np_dtype(dtype, "m")
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assert not tslibs.is_unitless(dtype)
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assert isinstance(values, np.ndarray), type(values)
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assert dtype == values.dtype
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assert freq is None or isinstance(freq, Tick)
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result = super()._simple_new(values=values, dtype=dtype)
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result._freq = freq
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return result
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@classmethod
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def _from_sequence(cls, data, *, dtype=None, copy: bool = False) -> Self:
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if dtype:
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dtype = _validate_td64_dtype(dtype)
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data, freq = sequence_to_td64ns(data, copy=copy, unit=None)
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if dtype is not None:
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data = astype_overflowsafe(data, dtype=dtype, copy=False)
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return cls._simple_new(data, dtype=data.dtype, freq=freq)
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@classmethod
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def _from_sequence_not_strict(
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cls,
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data,
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*,
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dtype=None,
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copy: bool = False,
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freq=lib.no_default,
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unit=None,
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) -> Self:
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"""
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_from_sequence_not_strict but without responsibility for finding the
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result's `freq`.
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"""
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if dtype:
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dtype = _validate_td64_dtype(dtype)
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assert unit not in ["Y", "y", "M"] # caller is responsible for checking
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data, inferred_freq = sequence_to_td64ns(data, copy=copy, unit=unit)
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if dtype is not None:
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data = astype_overflowsafe(data, dtype=dtype, copy=False)
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result = cls._simple_new(data, dtype=data.dtype, freq=inferred_freq)
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result._maybe_pin_freq(freq, {})
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return result
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@classmethod
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def _generate_range(
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cls, start, end, periods, freq, closed=None, *, unit: str | None = None
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) -> Self:
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periods = dtl.validate_periods(periods)
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if freq is None and any(x is None for x in [periods, start, end]):
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raise ValueError("Must provide freq argument if no data is supplied")
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if com.count_not_none(start, end, periods, freq) != 3:
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raise ValueError(
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"Of the four parameters: start, end, periods, "
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"and freq, exactly three must be specified"
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)
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if start is not None:
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start = Timedelta(start).as_unit("ns")
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if end is not None:
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end = Timedelta(end).as_unit("ns")
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if unit is not None:
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if unit not in ["s", "ms", "us", "ns"]:
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raise ValueError("'unit' must be one of 's', 'ms', 'us', 'ns'")
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else:
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unit = "ns"
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if start is not None and unit is not None:
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start = start.as_unit(unit, round_ok=False)
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if end is not None and unit is not None:
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end = end.as_unit(unit, round_ok=False)
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left_closed, right_closed = validate_endpoints(closed)
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if freq is not None:
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index = generate_regular_range(start, end, periods, freq, unit=unit)
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else:
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index = np.linspace(start._value, end._value, periods).astype("i8")
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if not left_closed:
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index = index[1:]
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if not right_closed:
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index = index[:-1]
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td64values = index.view(f"m8[{unit}]")
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return cls._simple_new(td64values, dtype=td64values.dtype, freq=freq)
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# ----------------------------------------------------------------
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# DatetimeLike Interface
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def _unbox_scalar(self, value) -> np.timedelta64:
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if not isinstance(value, self._scalar_type) and value is not NaT:
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raise ValueError("'value' should be a Timedelta.")
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self._check_compatible_with(value)
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if value is NaT:
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return np.timedelta64(value._value, self.unit)
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else:
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return value.as_unit(self.unit).asm8
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def _scalar_from_string(self, value) -> Timedelta | NaTType:
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return Timedelta(value)
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def _check_compatible_with(self, other) -> None:
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# we don't have anything to validate.
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pass
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# ----------------------------------------------------------------
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# Array-Like / EA-Interface Methods
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def astype(self, dtype, copy: bool = True):
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# We handle
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# --> timedelta64[ns]
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# --> timedelta64
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# DatetimeLikeArrayMixin super call handles other cases
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dtype = pandas_dtype(dtype)
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if lib.is_np_dtype(dtype, "m"):
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if dtype == self.dtype:
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if copy:
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return self.copy()
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return self
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if is_supported_dtype(dtype):
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# unit conversion e.g. timedelta64[s]
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res_values = astype_overflowsafe(self._ndarray, dtype, copy=False)
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return type(self)._simple_new(
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res_values, dtype=res_values.dtype, freq=self.freq
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)
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else:
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raise ValueError(
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f"Cannot convert from {self.dtype} to {dtype}. "
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"Supported resolutions are 's', 'ms', 'us', 'ns'"
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)
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return dtl.DatetimeLikeArrayMixin.astype(self, dtype, copy=copy)
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def __iter__(self) -> Iterator:
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if self.ndim > 1:
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for i in range(len(self)):
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yield self[i]
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else:
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# convert in chunks of 10k for efficiency
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data = self._ndarray
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length = len(self)
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chunksize = 10000
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chunks = (length // chunksize) + 1
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for i in range(chunks):
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start_i = i * chunksize
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end_i = min((i + 1) * chunksize, length)
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converted = ints_to_pytimedelta(data[start_i:end_i], box=True)
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yield from converted
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# ----------------------------------------------------------------
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# Reductions
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def sum(
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self,
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*,
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axis: AxisInt | None = None,
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dtype: NpDtype | None = None,
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out=None,
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keepdims: bool = False,
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initial=None,
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skipna: bool = True,
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min_count: int = 0,
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):
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nv.validate_sum(
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(), {"dtype": dtype, "out": out, "keepdims": keepdims, "initial": initial}
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)
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result = nanops.nansum(
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self._ndarray, axis=axis, skipna=skipna, min_count=min_count
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)
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return self._wrap_reduction_result(axis, result)
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def std(
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self,
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*,
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axis: AxisInt | None = None,
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dtype: NpDtype | None = None,
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out=None,
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ddof: int = 1,
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keepdims: bool = False,
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skipna: bool = True,
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):
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nv.validate_stat_ddof_func(
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(), {"dtype": dtype, "out": out, "keepdims": keepdims}, fname="std"
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)
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result = nanops.nanstd(self._ndarray, axis=axis, skipna=skipna, ddof=ddof)
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if axis is None or self.ndim == 1:
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return self._box_func(result)
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return self._from_backing_data(result)
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# ----------------------------------------------------------------
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# Accumulations
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def _accumulate(self, name: str, *, skipna: bool = True, **kwargs):
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if name == "cumsum":
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op = getattr(datetimelike_accumulations, name)
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result = op(self._ndarray.copy(), skipna=skipna, **kwargs)
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return type(self)._simple_new(result, freq=None, dtype=self.dtype)
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elif name == "cumprod":
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raise TypeError("cumprod not supported for Timedelta.")
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else:
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return super()._accumulate(name, skipna=skipna, **kwargs)
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# ----------------------------------------------------------------
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# Rendering Methods
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def _formatter(self, boxed: bool = False):
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from pandas.io.formats.format import get_format_timedelta64
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return get_format_timedelta64(self, box=True)
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def _format_native_types(
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self, *, na_rep: str | float = "NaT", date_format=None, **kwargs
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) -> npt.NDArray[np.object_]:
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from pandas.io.formats.format import get_format_timedelta64
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# Relies on TimeDelta._repr_base
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formatter = get_format_timedelta64(self, na_rep)
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# equiv: np.array([formatter(x) for x in self._ndarray])
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# but independent of dimension
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return np.frompyfunc(formatter, 1, 1)(self._ndarray)
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# ----------------------------------------------------------------
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# Arithmetic Methods
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def _add_offset(self, other):
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assert not isinstance(other, Tick)
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raise TypeError(
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f"cannot add the type {type(other).__name__} to a {type(self).__name__}"
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)
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@unpack_zerodim_and_defer("__mul__")
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def __mul__(self, other) -> Self:
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if is_scalar(other):
|
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# numpy will accept float and int, raise TypeError for others
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result = self._ndarray * other
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freq = None
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if self.freq is not None and not isna(other):
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freq = self.freq * other
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if freq.n == 0:
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# GH#51575 Better to have no freq than an incorrect one
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freq = None
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return type(self)._simple_new(result, dtype=result.dtype, freq=freq)
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|
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if not hasattr(other, "dtype"):
|
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# list, tuple
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other = np.array(other)
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if len(other) != len(self) and not lib.is_np_dtype(other.dtype, "m"):
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# Exclude timedelta64 here so we correctly raise TypeError
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# for that instead of ValueError
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raise ValueError("Cannot multiply with unequal lengths")
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|
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if is_object_dtype(other.dtype):
|
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# this multiplication will succeed only if all elements of other
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# are int or float scalars, so we will end up with
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# timedelta64[ns]-dtyped result
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arr = self._ndarray
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result = [arr[n] * other[n] for n in range(len(self))]
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result = np.array(result)
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return type(self)._simple_new(result, dtype=result.dtype)
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# numpy will accept float or int dtype, raise TypeError for others
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result = self._ndarray * other
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return type(self)._simple_new(result, dtype=result.dtype)
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__rmul__ = __mul__
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|
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def _scalar_divlike_op(self, other, op):
|
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"""
|
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Shared logic for __truediv__, __rtruediv__, __floordiv__, __rfloordiv__
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with scalar 'other'.
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"""
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if isinstance(other, self._recognized_scalars):
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other = Timedelta(other)
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# mypy assumes that __new__ returns an instance of the class
|
|
# github.com/python/mypy/issues/1020
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if cast("Timedelta | NaTType", other) is NaT:
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# specifically timedelta64-NaT
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res = np.empty(self.shape, dtype=np.float64)
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res.fill(np.nan)
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return res
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|
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# otherwise, dispatch to Timedelta implementation
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return op(self._ndarray, other)
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else:
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# caller is responsible for checking lib.is_scalar(other)
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# assume other is numeric, otherwise numpy will raise
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|
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if op in [roperator.rtruediv, roperator.rfloordiv]:
|
|
raise TypeError(
|
|
f"Cannot divide {type(other).__name__} by {type(self).__name__}"
|
|
)
|
|
|
|
result = op(self._ndarray, other)
|
|
freq = None
|
|
|
|
if self.freq is not None:
|
|
# Note: freq gets division, not floor-division, even if op
|
|
# is floordiv.
|
|
freq = self.freq / other
|
|
if freq.nanos == 0 and self.freq.nanos != 0:
|
|
# e.g. if self.freq is Nano(1) then dividing by 2
|
|
# rounds down to zero
|
|
freq = None
|
|
|
|
return type(self)._simple_new(result, dtype=result.dtype, freq=freq)
|
|
|
|
def _cast_divlike_op(self, other):
|
|
if not hasattr(other, "dtype"):
|
|
# e.g. list, tuple
|
|
other = np.array(other)
|
|
|
|
if len(other) != len(self):
|
|
raise ValueError("Cannot divide vectors with unequal lengths")
|
|
return other
|
|
|
|
def _vector_divlike_op(self, other, op) -> np.ndarray | Self:
|
|
"""
|
|
Shared logic for __truediv__, __floordiv__, and their reversed versions
|
|
with timedelta64-dtype ndarray other.
|
|
"""
|
|
# Let numpy handle it
|
|
result = op(self._ndarray, np.asarray(other))
|
|
|
|
if (is_integer_dtype(other.dtype) or is_float_dtype(other.dtype)) and op in [
|
|
operator.truediv,
|
|
operator.floordiv,
|
|
]:
|
|
return type(self)._simple_new(result, dtype=result.dtype)
|
|
|
|
if op in [operator.floordiv, roperator.rfloordiv]:
|
|
mask = self.isna() | isna(other)
|
|
if mask.any():
|
|
result = result.astype(np.float64)
|
|
np.putmask(result, mask, np.nan)
|
|
|
|
return result
|
|
|
|
@unpack_zerodim_and_defer("__truediv__")
|
|
def __truediv__(self, other):
|
|
# timedelta / X is well-defined for timedelta-like or numeric X
|
|
op = operator.truediv
|
|
if is_scalar(other):
|
|
return self._scalar_divlike_op(other, op)
|
|
|
|
other = self._cast_divlike_op(other)
|
|
if (
|
|
lib.is_np_dtype(other.dtype, "m")
|
|
or is_integer_dtype(other.dtype)
|
|
or is_float_dtype(other.dtype)
|
|
):
|
|
return self._vector_divlike_op(other, op)
|
|
|
|
if is_object_dtype(other.dtype):
|
|
other = np.asarray(other)
|
|
if self.ndim > 1:
|
|
res_cols = [left / right for left, right in zip(self, other)]
|
|
res_cols2 = [x.reshape(1, -1) for x in res_cols]
|
|
result = np.concatenate(res_cols2, axis=0)
|
|
else:
|
|
result = truediv_object_array(self._ndarray, other)
|
|
|
|
return result
|
|
|
|
else:
|
|
return NotImplemented
|
|
|
|
@unpack_zerodim_and_defer("__rtruediv__")
|
|
def __rtruediv__(self, other):
|
|
# X / timedelta is defined only for timedelta-like X
|
|
op = roperator.rtruediv
|
|
if is_scalar(other):
|
|
return self._scalar_divlike_op(other, op)
|
|
|
|
other = self._cast_divlike_op(other)
|
|
if lib.is_np_dtype(other.dtype, "m"):
|
|
return self._vector_divlike_op(other, op)
|
|
|
|
elif is_object_dtype(other.dtype):
|
|
# Note: unlike in __truediv__, we do not _need_ to do type
|
|
# inference on the result. It does not raise, a numeric array
|
|
# is returned. GH#23829
|
|
result_list = [other[n] / self[n] for n in range(len(self))]
|
|
return np.array(result_list)
|
|
|
|
else:
|
|
return NotImplemented
|
|
|
|
@unpack_zerodim_and_defer("__floordiv__")
|
|
def __floordiv__(self, other):
|
|
op = operator.floordiv
|
|
if is_scalar(other):
|
|
return self._scalar_divlike_op(other, op)
|
|
|
|
other = self._cast_divlike_op(other)
|
|
if (
|
|
lib.is_np_dtype(other.dtype, "m")
|
|
or is_integer_dtype(other.dtype)
|
|
or is_float_dtype(other.dtype)
|
|
):
|
|
return self._vector_divlike_op(other, op)
|
|
|
|
elif is_object_dtype(other.dtype):
|
|
other = np.asarray(other)
|
|
if self.ndim > 1:
|
|
res_cols = [left // right for left, right in zip(self, other)]
|
|
res_cols2 = [x.reshape(1, -1) for x in res_cols]
|
|
result = np.concatenate(res_cols2, axis=0)
|
|
else:
|
|
result = floordiv_object_array(self._ndarray, other)
|
|
|
|
assert result.dtype == object
|
|
return result
|
|
|
|
else:
|
|
return NotImplemented
|
|
|
|
@unpack_zerodim_and_defer("__rfloordiv__")
|
|
def __rfloordiv__(self, other):
|
|
op = roperator.rfloordiv
|
|
if is_scalar(other):
|
|
return self._scalar_divlike_op(other, op)
|
|
|
|
other = self._cast_divlike_op(other)
|
|
if lib.is_np_dtype(other.dtype, "m"):
|
|
return self._vector_divlike_op(other, op)
|
|
|
|
elif is_object_dtype(other.dtype):
|
|
result_list = [other[n] // self[n] for n in range(len(self))]
|
|
result = np.array(result_list)
|
|
return result
|
|
|
|
else:
|
|
return NotImplemented
|
|
|
|
@unpack_zerodim_and_defer("__mod__")
|
|
def __mod__(self, other):
|
|
# Note: This is a naive implementation, can likely be optimized
|
|
if isinstance(other, self._recognized_scalars):
|
|
other = Timedelta(other)
|
|
return self - (self // other) * other
|
|
|
|
@unpack_zerodim_and_defer("__rmod__")
|
|
def __rmod__(self, other):
|
|
# Note: This is a naive implementation, can likely be optimized
|
|
if isinstance(other, self._recognized_scalars):
|
|
other = Timedelta(other)
|
|
return other - (other // self) * self
|
|
|
|
@unpack_zerodim_and_defer("__divmod__")
|
|
def __divmod__(self, other):
|
|
# Note: This is a naive implementation, can likely be optimized
|
|
if isinstance(other, self._recognized_scalars):
|
|
other = Timedelta(other)
|
|
|
|
res1 = self // other
|
|
res2 = self - res1 * other
|
|
return res1, res2
|
|
|
|
@unpack_zerodim_and_defer("__rdivmod__")
|
|
def __rdivmod__(self, other):
|
|
# Note: This is a naive implementation, can likely be optimized
|
|
if isinstance(other, self._recognized_scalars):
|
|
other = Timedelta(other)
|
|
|
|
res1 = other // self
|
|
res2 = other - res1 * self
|
|
return res1, res2
|
|
|
|
def __neg__(self) -> TimedeltaArray:
|
|
freq = None
|
|
if self.freq is not None:
|
|
freq = -self.freq
|
|
return type(self)._simple_new(-self._ndarray, dtype=self.dtype, freq=freq)
|
|
|
|
def __pos__(self) -> TimedeltaArray:
|
|
return type(self)._simple_new(
|
|
self._ndarray.copy(), dtype=self.dtype, freq=self.freq
|
|
)
|
|
|
|
def __abs__(self) -> TimedeltaArray:
|
|
# Note: freq is not preserved
|
|
return type(self)._simple_new(np.abs(self._ndarray), dtype=self.dtype)
|
|
|
|
# ----------------------------------------------------------------
|
|
# Conversion Methods - Vectorized analogues of Timedelta methods
|
|
|
|
def total_seconds(self) -> npt.NDArray[np.float64]:
|
|
"""
|
|
Return total duration of each element expressed in seconds.
|
|
|
|
This method is available directly on TimedeltaArray, TimedeltaIndex
|
|
and on Series containing timedelta values under the ``.dt`` namespace.
|
|
|
|
Returns
|
|
-------
|
|
ndarray, Index or Series
|
|
When the calling object is a TimedeltaArray, the return type
|
|
is ndarray. When the calling object is a TimedeltaIndex,
|
|
the return type is an Index with a float64 dtype. When the calling object
|
|
is a Series, the return type is Series of type `float64` whose
|
|
index is the same as the original.
|
|
|
|
See Also
|
|
--------
|
|
datetime.timedelta.total_seconds : Standard library version
|
|
of this method.
|
|
TimedeltaIndex.components : Return a DataFrame with components of
|
|
each Timedelta.
|
|
|
|
Examples
|
|
--------
|
|
**Series**
|
|
|
|
>>> s = pd.Series(pd.to_timedelta(np.arange(5), unit='d'))
|
|
>>> s
|
|
0 0 days
|
|
1 1 days
|
|
2 2 days
|
|
3 3 days
|
|
4 4 days
|
|
dtype: timedelta64[ns]
|
|
|
|
>>> s.dt.total_seconds()
|
|
0 0.0
|
|
1 86400.0
|
|
2 172800.0
|
|
3 259200.0
|
|
4 345600.0
|
|
dtype: float64
|
|
|
|
**TimedeltaIndex**
|
|
|
|
>>> idx = pd.to_timedelta(np.arange(5), unit='d')
|
|
>>> idx
|
|
TimedeltaIndex(['0 days', '1 days', '2 days', '3 days', '4 days'],
|
|
dtype='timedelta64[ns]', freq=None)
|
|
|
|
>>> idx.total_seconds()
|
|
Index([0.0, 86400.0, 172800.0, 259200.0, 345600.0], dtype='float64')
|
|
"""
|
|
pps = periods_per_second(self._creso)
|
|
return self._maybe_mask_results(self.asi8 / pps, fill_value=None)
|
|
|
|
def to_pytimedelta(self) -> npt.NDArray[np.object_]:
|
|
"""
|
|
Return an ndarray of datetime.timedelta objects.
|
|
|
|
Returns
|
|
-------
|
|
numpy.ndarray
|
|
|
|
Examples
|
|
--------
|
|
>>> tdelta_idx = pd.to_timedelta([1, 2, 3], unit='D')
|
|
>>> tdelta_idx
|
|
TimedeltaIndex(['1 days', '2 days', '3 days'],
|
|
dtype='timedelta64[ns]', freq=None)
|
|
>>> tdelta_idx.to_pytimedelta()
|
|
array([datetime.timedelta(days=1), datetime.timedelta(days=2),
|
|
datetime.timedelta(days=3)], dtype=object)
|
|
"""
|
|
return ints_to_pytimedelta(self._ndarray)
|
|
|
|
days_docstring = textwrap.dedent(
|
|
"""Number of days for each element.
|
|
|
|
Examples
|
|
--------
|
|
For Series:
|
|
|
|
>>> ser = pd.Series(pd.to_timedelta([1, 2, 3], unit='d'))
|
|
>>> ser
|
|
0 1 days
|
|
1 2 days
|
|
2 3 days
|
|
dtype: timedelta64[ns]
|
|
>>> ser.dt.days
|
|
0 1
|
|
1 2
|
|
2 3
|
|
dtype: int64
|
|
|
|
For TimedeltaIndex:
|
|
|
|
>>> tdelta_idx = pd.to_timedelta(["0 days", "10 days", "20 days"])
|
|
>>> tdelta_idx
|
|
TimedeltaIndex(['0 days', '10 days', '20 days'],
|
|
dtype='timedelta64[ns]', freq=None)
|
|
>>> tdelta_idx.days
|
|
Index([0, 10, 20], dtype='int64')"""
|
|
)
|
|
days = _field_accessor("days", "days", days_docstring)
|
|
|
|
seconds_docstring = textwrap.dedent(
|
|
"""Number of seconds (>= 0 and less than 1 day) for each element.
|
|
|
|
Examples
|
|
--------
|
|
For Series:
|
|
|
|
>>> ser = pd.Series(pd.to_timedelta([1, 2, 3], unit='s'))
|
|
>>> ser
|
|
0 0 days 00:00:01
|
|
1 0 days 00:00:02
|
|
2 0 days 00:00:03
|
|
dtype: timedelta64[ns]
|
|
>>> ser.dt.seconds
|
|
0 1
|
|
1 2
|
|
2 3
|
|
dtype: int32
|
|
|
|
For TimedeltaIndex:
|
|
|
|
>>> tdelta_idx = pd.to_timedelta([1, 2, 3], unit='s')
|
|
>>> tdelta_idx
|
|
TimedeltaIndex(['0 days 00:00:01', '0 days 00:00:02', '0 days 00:00:03'],
|
|
dtype='timedelta64[ns]', freq=None)
|
|
>>> tdelta_idx.seconds
|
|
Index([1, 2, 3], dtype='int32')"""
|
|
)
|
|
seconds = _field_accessor(
|
|
"seconds",
|
|
"seconds",
|
|
seconds_docstring,
|
|
)
|
|
|
|
microseconds_docstring = textwrap.dedent(
|
|
"""Number of microseconds (>= 0 and less than 1 second) for each element.
|
|
|
|
Examples
|
|
--------
|
|
For Series:
|
|
|
|
>>> ser = pd.Series(pd.to_timedelta([1, 2, 3], unit='us'))
|
|
>>> ser
|
|
0 0 days 00:00:00.000001
|
|
1 0 days 00:00:00.000002
|
|
2 0 days 00:00:00.000003
|
|
dtype: timedelta64[ns]
|
|
>>> ser.dt.microseconds
|
|
0 1
|
|
1 2
|
|
2 3
|
|
dtype: int32
|
|
|
|
For TimedeltaIndex:
|
|
|
|
>>> tdelta_idx = pd.to_timedelta([1, 2, 3], unit='us')
|
|
>>> tdelta_idx
|
|
TimedeltaIndex(['0 days 00:00:00.000001', '0 days 00:00:00.000002',
|
|
'0 days 00:00:00.000003'],
|
|
dtype='timedelta64[ns]', freq=None)
|
|
>>> tdelta_idx.microseconds
|
|
Index([1, 2, 3], dtype='int32')"""
|
|
)
|
|
microseconds = _field_accessor(
|
|
"microseconds",
|
|
"microseconds",
|
|
microseconds_docstring,
|
|
)
|
|
|
|
nanoseconds_docstring = textwrap.dedent(
|
|
"""Number of nanoseconds (>= 0 and less than 1 microsecond) for each element.
|
|
|
|
Examples
|
|
--------
|
|
For Series:
|
|
|
|
>>> ser = pd.Series(pd.to_timedelta([1, 2, 3], unit='ns'))
|
|
>>> ser
|
|
0 0 days 00:00:00.000000001
|
|
1 0 days 00:00:00.000000002
|
|
2 0 days 00:00:00.000000003
|
|
dtype: timedelta64[ns]
|
|
>>> ser.dt.nanoseconds
|
|
0 1
|
|
1 2
|
|
2 3
|
|
dtype: int32
|
|
|
|
For TimedeltaIndex:
|
|
|
|
>>> tdelta_idx = pd.to_timedelta([1, 2, 3], unit='ns')
|
|
>>> tdelta_idx
|
|
TimedeltaIndex(['0 days 00:00:00.000000001', '0 days 00:00:00.000000002',
|
|
'0 days 00:00:00.000000003'],
|
|
dtype='timedelta64[ns]', freq=None)
|
|
>>> tdelta_idx.nanoseconds
|
|
Index([1, 2, 3], dtype='int32')"""
|
|
)
|
|
nanoseconds = _field_accessor(
|
|
"nanoseconds",
|
|
"nanoseconds",
|
|
nanoseconds_docstring,
|
|
)
|
|
|
|
@property
|
|
def components(self) -> DataFrame:
|
|
"""
|
|
Return a DataFrame of the individual resolution components of the Timedeltas.
|
|
|
|
The components (days, hours, minutes seconds, milliseconds, microseconds,
|
|
nanoseconds) are returned as columns in a DataFrame.
|
|
|
|
Returns
|
|
-------
|
|
DataFrame
|
|
|
|
Examples
|
|
--------
|
|
>>> tdelta_idx = pd.to_timedelta(['1 day 3 min 2 us 42 ns'])
|
|
>>> tdelta_idx
|
|
TimedeltaIndex(['1 days 00:03:00.000002042'],
|
|
dtype='timedelta64[ns]', freq=None)
|
|
>>> tdelta_idx.components
|
|
days hours minutes seconds milliseconds microseconds nanoseconds
|
|
0 1 0 3 0 0 2 42
|
|
"""
|
|
from pandas import DataFrame
|
|
|
|
columns = [
|
|
"days",
|
|
"hours",
|
|
"minutes",
|
|
"seconds",
|
|
"milliseconds",
|
|
"microseconds",
|
|
"nanoseconds",
|
|
]
|
|
hasnans = self._hasna
|
|
if hasnans:
|
|
|
|
def f(x):
|
|
if isna(x):
|
|
return [np.nan] * len(columns)
|
|
return x.components
|
|
|
|
else:
|
|
|
|
def f(x):
|
|
return x.components
|
|
|
|
result = DataFrame([f(x) for x in self], columns=columns)
|
|
if not hasnans:
|
|
result = result.astype("int64")
|
|
return result
|
|
|
|
|
|
# ---------------------------------------------------------------------
|
|
# Constructor Helpers
|
|
|
|
|
|
def sequence_to_td64ns(
|
|
data,
|
|
copy: bool = False,
|
|
unit=None,
|
|
errors: DateTimeErrorChoices = "raise",
|
|
) -> tuple[np.ndarray, Tick | None]:
|
|
"""
|
|
Parameters
|
|
----------
|
|
data : list-like
|
|
copy : bool, default False
|
|
unit : str, optional
|
|
The timedelta unit to treat integers as multiples of. For numeric
|
|
data this defaults to ``'ns'``.
|
|
Must be un-specified if the data contains a str and ``errors=="raise"``.
|
|
errors : {"raise", "coerce", "ignore"}, default "raise"
|
|
How to handle elements that cannot be converted to timedelta64[ns].
|
|
See ``pandas.to_timedelta`` for details.
|
|
|
|
Returns
|
|
-------
|
|
converted : numpy.ndarray
|
|
The sequence converted to a numpy array with dtype ``timedelta64[ns]``.
|
|
inferred_freq : Tick or None
|
|
The inferred frequency of the sequence.
|
|
|
|
Raises
|
|
------
|
|
ValueError : Data cannot be converted to timedelta64[ns].
|
|
|
|
Notes
|
|
-----
|
|
Unlike `pandas.to_timedelta`, if setting ``errors=ignore`` will not cause
|
|
errors to be ignored; they are caught and subsequently ignored at a
|
|
higher level.
|
|
"""
|
|
assert unit not in ["Y", "y", "M"] # caller is responsible for checking
|
|
|
|
inferred_freq = None
|
|
if unit is not None:
|
|
unit = parse_timedelta_unit(unit)
|
|
|
|
data, copy = dtl.ensure_arraylike_for_datetimelike(
|
|
data, copy, cls_name="TimedeltaArray"
|
|
)
|
|
|
|
if isinstance(data, TimedeltaArray):
|
|
inferred_freq = data.freq
|
|
|
|
# Convert whatever we have into timedelta64[ns] dtype
|
|
if data.dtype == object or is_string_dtype(data.dtype):
|
|
# no need to make a copy, need to convert if string-dtyped
|
|
data = _objects_to_td64ns(data, unit=unit, errors=errors)
|
|
copy = False
|
|
|
|
elif is_integer_dtype(data.dtype):
|
|
# treat as multiples of the given unit
|
|
data, copy_made = _ints_to_td64ns(data, unit=unit)
|
|
copy = copy and not copy_made
|
|
|
|
elif is_float_dtype(data.dtype):
|
|
# cast the unit, multiply base/frac separately
|
|
# to avoid precision issues from float -> int
|
|
if isinstance(data.dtype, ExtensionDtype):
|
|
mask = data._mask
|
|
data = data._data
|
|
else:
|
|
mask = np.isnan(data)
|
|
|
|
data = cast_from_unit_vectorized(data, unit or "ns")
|
|
data[mask] = iNaT
|
|
data = data.view("m8[ns]")
|
|
copy = False
|
|
|
|
elif lib.is_np_dtype(data.dtype, "m"):
|
|
if not is_supported_dtype(data.dtype):
|
|
# cast to closest supported unit, i.e. s or ns
|
|
new_dtype = get_supported_dtype(data.dtype)
|
|
data = astype_overflowsafe(data, dtype=new_dtype, copy=False)
|
|
copy = False
|
|
|
|
else:
|
|
# This includes datetime64-dtype, see GH#23539, GH#29794
|
|
raise TypeError(f"dtype {data.dtype} cannot be converted to timedelta64[ns]")
|
|
|
|
if not copy:
|
|
data = np.asarray(data)
|
|
else:
|
|
data = np.array(data, copy=copy)
|
|
|
|
assert data.dtype.kind == "m"
|
|
assert data.dtype != "m8" # i.e. not unit-less
|
|
|
|
return data, inferred_freq
|
|
|
|
|
|
def _ints_to_td64ns(data, unit: str = "ns"):
|
|
"""
|
|
Convert an ndarray with integer-dtype to timedelta64[ns] dtype, treating
|
|
the integers as multiples of the given timedelta unit.
|
|
|
|
Parameters
|
|
----------
|
|
data : numpy.ndarray with integer-dtype
|
|
unit : str, default "ns"
|
|
The timedelta unit to treat integers as multiples of.
|
|
|
|
Returns
|
|
-------
|
|
numpy.ndarray : timedelta64[ns] array converted from data
|
|
bool : whether a copy was made
|
|
"""
|
|
copy_made = False
|
|
unit = unit if unit is not None else "ns"
|
|
|
|
if data.dtype != np.int64:
|
|
# converting to int64 makes a copy, so we can avoid
|
|
# re-copying later
|
|
data = data.astype(np.int64)
|
|
copy_made = True
|
|
|
|
if unit != "ns":
|
|
dtype_str = f"timedelta64[{unit}]"
|
|
data = data.view(dtype_str)
|
|
|
|
data = astype_overflowsafe(data, dtype=TD64NS_DTYPE)
|
|
|
|
# the astype conversion makes a copy, so we can avoid re-copying later
|
|
copy_made = True
|
|
|
|
else:
|
|
data = data.view("timedelta64[ns]")
|
|
|
|
return data, copy_made
|
|
|
|
|
|
def _objects_to_td64ns(data, unit=None, errors: DateTimeErrorChoices = "raise"):
|
|
"""
|
|
Convert a object-dtyped or string-dtyped array into an
|
|
timedelta64[ns]-dtyped array.
|
|
|
|
Parameters
|
|
----------
|
|
data : ndarray or Index
|
|
unit : str, default "ns"
|
|
The timedelta unit to treat integers as multiples of.
|
|
Must not be specified if the data contains a str.
|
|
errors : {"raise", "coerce", "ignore"}, default "raise"
|
|
How to handle elements that cannot be converted to timedelta64[ns].
|
|
See ``pandas.to_timedelta`` for details.
|
|
|
|
Returns
|
|
-------
|
|
numpy.ndarray : timedelta64[ns] array converted from data
|
|
|
|
Raises
|
|
------
|
|
ValueError : Data cannot be converted to timedelta64[ns].
|
|
|
|
Notes
|
|
-----
|
|
Unlike `pandas.to_timedelta`, if setting `errors=ignore` will not cause
|
|
errors to be ignored; they are caught and subsequently ignored at a
|
|
higher level.
|
|
"""
|
|
# coerce Index to np.ndarray, converting string-dtype if necessary
|
|
values = np.asarray(data, dtype=np.object_)
|
|
|
|
result = array_to_timedelta64(values, unit=unit, errors=errors)
|
|
return result.view("timedelta64[ns]")
|
|
|
|
|
|
def _validate_td64_dtype(dtype) -> DtypeObj:
|
|
dtype = pandas_dtype(dtype)
|
|
if dtype == np.dtype("m8"):
|
|
# no precision disallowed GH#24806
|
|
msg = (
|
|
"Passing in 'timedelta' dtype with no precision is not allowed. "
|
|
"Please pass in 'timedelta64[ns]' instead."
|
|
)
|
|
raise ValueError(msg)
|
|
|
|
if not lib.is_np_dtype(dtype, "m"):
|
|
raise ValueError(f"dtype '{dtype}' is invalid, should be np.timedelta64 dtype")
|
|
elif not is_supported_dtype(dtype):
|
|
raise ValueError("Supported timedelta64 resolutions are 's', 'ms', 'us', 'ns'")
|
|
|
|
return dtype
|