395 lines
12 KiB
Python
395 lines
12 KiB
Python
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from __future__ import annotations
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import numbers
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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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missing as libmissing,
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)
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from pandas._typing import (
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Dtype,
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DtypeObj,
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type_t,
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)
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from pandas.core.dtypes.common import (
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is_list_like,
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is_numeric_dtype,
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)
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from pandas.core.dtypes.dtypes import register_extension_dtype
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from pandas.core.dtypes.missing import isna
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from pandas.core import ops
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from pandas.core.array_algos import masked_accumulations
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from pandas.core.arrays.masked import (
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BaseMaskedArray,
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BaseMaskedDtype,
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)
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if TYPE_CHECKING:
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import pyarrow
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from pandas._typing import npt
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@register_extension_dtype
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class BooleanDtype(BaseMaskedDtype):
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"""
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Extension dtype for boolean data.
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.. warning::
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BooleanDtype is considered experimental. The implementation and
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parts of the API may change without warning.
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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.BooleanDtype()
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BooleanDtype
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"""
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name = "boolean"
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# https://github.com/python/mypy/issues/4125
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# error: Signature of "type" incompatible with supertype "BaseMaskedDtype"
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@property
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def type(self) -> type: # type: ignore[override]
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return np.bool_
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@property
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def kind(self) -> str:
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return "b"
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@property
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def numpy_dtype(self) -> np.dtype:
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return np.dtype("bool")
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@classmethod
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def construct_array_type(cls) -> type_t[BooleanArray]:
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"""
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Return the array type associated with this dtype.
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Returns
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-------
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type
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"""
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return BooleanArray
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def __repr__(self) -> str:
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return "BooleanDtype"
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@property
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def _is_boolean(self) -> bool:
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return True
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@property
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def _is_numeric(self) -> bool:
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return True
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def __from_arrow__(
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self, array: pyarrow.Array | pyarrow.ChunkedArray
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) -> BooleanArray:
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"""
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Construct BooleanArray from pyarrow Array/ChunkedArray.
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"""
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import pyarrow
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if array.type != pyarrow.bool_():
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raise TypeError(f"Expected array of boolean type, got {array.type} instead")
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if isinstance(array, pyarrow.Array):
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chunks = [array]
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else:
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# pyarrow.ChunkedArray
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chunks = array.chunks
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results = []
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for arr in chunks:
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buflist = arr.buffers()
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data = pyarrow.BooleanArray.from_buffers(
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arr.type, len(arr), [None, buflist[1]], offset=arr.offset
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).to_numpy(zero_copy_only=False)
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if arr.null_count != 0:
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mask = pyarrow.BooleanArray.from_buffers(
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arr.type, len(arr), [None, buflist[0]], offset=arr.offset
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).to_numpy(zero_copy_only=False)
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mask = ~mask
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else:
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mask = np.zeros(len(arr), dtype=bool)
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bool_arr = BooleanArray(data, mask)
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results.append(bool_arr)
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if not results:
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return BooleanArray(
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np.array([], dtype=np.bool_), np.array([], dtype=np.bool_)
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)
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else:
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return BooleanArray._concat_same_type(results)
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def coerce_to_array(
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values, mask=None, copy: bool = False
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) -> tuple[np.ndarray, np.ndarray]:
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"""
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Coerce the input values array to numpy arrays with a mask.
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Parameters
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----------
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values : 1D list-like
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mask : bool 1D array, optional
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copy : bool, default False
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if True, copy the input
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Returns
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-------
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tuple of (values, mask)
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"""
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if isinstance(values, BooleanArray):
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if mask is not None:
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raise ValueError("cannot pass mask for BooleanArray input")
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values, mask = values._data, values._mask
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if copy:
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values = values.copy()
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mask = mask.copy()
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return values, mask
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mask_values = None
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if isinstance(values, np.ndarray) and values.dtype == np.bool_:
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if copy:
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values = values.copy()
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elif isinstance(values, np.ndarray) and is_numeric_dtype(values.dtype):
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mask_values = isna(values)
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values_bool = np.zeros(len(values), dtype=bool)
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values_bool[~mask_values] = values[~mask_values].astype(bool)
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if not np.all(
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values_bool[~mask_values].astype(values.dtype) == values[~mask_values]
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):
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raise TypeError("Need to pass bool-like values")
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values = values_bool
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else:
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values_object = np.asarray(values, dtype=object)
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inferred_dtype = lib.infer_dtype(values_object, skipna=True)
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integer_like = ("floating", "integer", "mixed-integer-float")
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if inferred_dtype not in ("boolean", "empty") + integer_like:
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raise TypeError("Need to pass bool-like values")
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# mypy does not narrow the type of mask_values to npt.NDArray[np.bool_]
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# within this branch, it assumes it can also be None
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mask_values = cast("npt.NDArray[np.bool_]", isna(values_object))
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values = np.zeros(len(values), dtype=bool)
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values[~mask_values] = values_object[~mask_values].astype(bool)
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# if the values were integer-like, validate it were actually 0/1's
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if (inferred_dtype in integer_like) and not (
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np.all(
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values[~mask_values].astype(float)
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== values_object[~mask_values].astype(float)
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)
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):
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raise TypeError("Need to pass bool-like values")
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if mask is None and mask_values is None:
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mask = np.zeros(values.shape, dtype=bool)
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elif mask is None:
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mask = mask_values
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else:
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if isinstance(mask, np.ndarray) and mask.dtype == np.bool_:
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if mask_values is not None:
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mask = mask | mask_values
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else:
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if copy:
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mask = mask.copy()
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else:
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mask = np.array(mask, dtype=bool)
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if mask_values is not None:
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mask = mask | mask_values
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if values.shape != mask.shape:
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raise ValueError("values.shape and mask.shape must match")
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return values, mask
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class BooleanArray(BaseMaskedArray):
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"""
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Array of boolean (True/False) data with missing values.
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This is a pandas Extension array for boolean data, under the hood
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represented by 2 numpy arrays: a boolean array with the data and
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a boolean array with the mask (True indicating missing).
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BooleanArray implements Kleene logic (sometimes called three-value
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logic) for logical operations. See :ref:`boolean.kleene` for more.
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To construct an BooleanArray from generic array-like input, use
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:func:`pandas.array` specifying ``dtype="boolean"`` (see examples
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below).
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.. warning::
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BooleanArray is considered experimental. The implementation and
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parts of the API may change without warning.
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Parameters
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----------
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values : numpy.ndarray
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A 1-d boolean-dtype array with the data.
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mask : numpy.ndarray
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A 1-d boolean-dtype array indicating missing values (True
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indicates missing).
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copy : bool, default False
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Whether to copy the `values` and `mask` arrays.
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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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Returns
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-------
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BooleanArray
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Examples
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--------
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Create an BooleanArray with :func:`pandas.array`:
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>>> pd.array([True, False, None], dtype="boolean")
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<BooleanArray>
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[True, False, <NA>]
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Length: 3, dtype: boolean
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"""
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# The value used to fill '_data' to avoid upcasting
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_internal_fill_value = False
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# Fill values used for any/all
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# Incompatible types in assignment (expression has type "bool", base class
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# "BaseMaskedArray" defined the type as "<typing special form>")
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_truthy_value = True # type: ignore[assignment]
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_falsey_value = False # type: ignore[assignment]
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_TRUE_VALUES = {"True", "TRUE", "true", "1", "1.0"}
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_FALSE_VALUES = {"False", "FALSE", "false", "0", "0.0"}
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def __init__(
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self, values: np.ndarray, mask: np.ndarray, copy: bool = False
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) -> None:
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if not (isinstance(values, np.ndarray) and values.dtype == np.bool_):
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raise TypeError(
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"values should be boolean numpy array. Use "
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"the 'pd.array' function instead"
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)
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self._dtype = BooleanDtype()
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super().__init__(values, mask, copy=copy)
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@property
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def dtype(self) -> BooleanDtype:
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return self._dtype
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@classmethod
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def _from_sequence_of_strings(
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cls,
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strings: list[str],
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*,
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dtype: Dtype | None = None,
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copy: bool = False,
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true_values: list[str] | None = None,
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false_values: list[str] | None = None,
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) -> BooleanArray:
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true_values_union = cls._TRUE_VALUES.union(true_values or [])
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false_values_union = cls._FALSE_VALUES.union(false_values or [])
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def map_string(s) -> bool:
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if s in true_values_union:
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return True
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elif s in false_values_union:
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return False
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else:
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raise ValueError(f"{s} cannot be cast to bool")
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scalars = np.array(strings, dtype=object)
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mask = isna(scalars)
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scalars[~mask] = list(map(map_string, scalars[~mask]))
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return cls._from_sequence(scalars, dtype=dtype, copy=copy)
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_HANDLED_TYPES = (np.ndarray, numbers.Number, bool, np.bool_)
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@classmethod
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def _coerce_to_array(
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cls, value, *, dtype: DtypeObj, copy: bool = False
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) -> tuple[np.ndarray, np.ndarray]:
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if dtype:
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assert dtype == "boolean"
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return coerce_to_array(value, copy=copy)
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def _logical_method(self, other, op):
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assert op.__name__ in {"or_", "ror_", "and_", "rand_", "xor", "rxor"}
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other_is_scalar = lib.is_scalar(other)
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mask = None
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if isinstance(other, BooleanArray):
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other, mask = other._data, other._mask
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elif is_list_like(other):
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other = np.asarray(other, dtype="bool")
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if other.ndim > 1:
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raise NotImplementedError("can only perform ops with 1-d structures")
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other, mask = coerce_to_array(other, copy=False)
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elif isinstance(other, np.bool_):
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other = other.item()
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if other_is_scalar and other is not libmissing.NA and not lib.is_bool(other):
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raise TypeError(
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"'other' should be pandas.NA or a bool. "
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f"Got {type(other).__name__} instead."
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)
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if not other_is_scalar and len(self) != len(other):
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raise ValueError("Lengths must match")
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if op.__name__ in {"or_", "ror_"}:
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result, mask = ops.kleene_or(self._data, other, self._mask, mask)
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elif op.__name__ in {"and_", "rand_"}:
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result, mask = ops.kleene_and(self._data, other, self._mask, mask)
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else:
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# i.e. xor, rxor
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result, mask = ops.kleene_xor(self._data, other, self._mask, mask)
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# i.e. BooleanArray
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return self._maybe_mask_result(result, mask)
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def _accumulate(
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self, name: str, *, skipna: bool = True, **kwargs
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) -> BaseMaskedArray:
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data = self._data
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mask = self._mask
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if name in ("cummin", "cummax"):
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op = getattr(masked_accumulations, name)
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data, mask = op(data, mask, skipna=skipna, **kwargs)
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return type(self)(data, mask, copy=False)
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else:
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from pandas.core.arrays import IntegerArray
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return IntegerArray(data.astype(int), mask)._accumulate(
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name, skipna=skipna, **kwargs
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)
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