62 lines
1.7 KiB
Python
62 lines
1.7 KiB
Python
import pytest
|
|
|
|
from pandas import (
|
|
DatetimeIndex,
|
|
date_range,
|
|
)
|
|
|
|
from pandas.tseries.offsets import (
|
|
BDay,
|
|
DateOffset,
|
|
Day,
|
|
Hour,
|
|
)
|
|
|
|
|
|
class TestFreq:
|
|
def test_freq_setter_errors(self):
|
|
# GH#20678
|
|
idx = DatetimeIndex(["20180101", "20180103", "20180105"])
|
|
|
|
# setting with an incompatible freq
|
|
msg = (
|
|
"Inferred frequency 2D from passed values does not conform to "
|
|
"passed frequency 5D"
|
|
)
|
|
with pytest.raises(ValueError, match=msg):
|
|
idx._data.freq = "5D"
|
|
|
|
# setting with non-freq string
|
|
with pytest.raises(ValueError, match="Invalid frequency"):
|
|
idx._data.freq = "foo"
|
|
|
|
@pytest.mark.parametrize("values", [["20180101", "20180103", "20180105"], []])
|
|
@pytest.mark.parametrize("freq", ["2D", Day(2), "2B", BDay(2), "48H", Hour(48)])
|
|
@pytest.mark.parametrize("tz", [None, "US/Eastern"])
|
|
def test_freq_setter(self, values, freq, tz):
|
|
# GH#20678
|
|
idx = DatetimeIndex(values, tz=tz)
|
|
|
|
# can set to an offset, converting from string if necessary
|
|
idx._data.freq = freq
|
|
assert idx.freq == freq
|
|
assert isinstance(idx.freq, DateOffset)
|
|
|
|
# can reset to None
|
|
idx._data.freq = None
|
|
assert idx.freq is None
|
|
|
|
def test_freq_view_safe(self):
|
|
# Setting the freq for one DatetimeIndex shouldn't alter the freq
|
|
# for another that views the same data
|
|
|
|
dti = date_range("2016-01-01", periods=5)
|
|
dta = dti._data
|
|
|
|
dti2 = DatetimeIndex(dta)._with_freq(None)
|
|
assert dti2.freq is None
|
|
|
|
# Original was not altered
|
|
assert dti.freq == "D"
|
|
assert dta.freq == "D"
|