72 lines
2.0 KiB
Python
72 lines
2.0 KiB
Python
|
"""
|
||
|
|
Note: includes tests for `last`
|
||
|
|
"""
|
||
|
|
import pytest
|
||
|
|
|
||
|
|
from pandas import DataFrame
|
||
|
|
import pandas._testing as tm
|
||
|
|
|
||
|
|
|
||
|
|
class TestFirst:
|
||
|
|
def test_first_subset(self, frame_or_series):
|
||
|
|
ts = tm.makeTimeDataFrame(freq="12h")
|
||
|
|
if frame_or_series is not DataFrame:
|
||
|
|
ts = ts["A"]
|
||
|
|
result = ts.first("10d")
|
||
|
|
assert len(result) == 20
|
||
|
|
|
||
|
|
ts = tm.makeTimeDataFrame(freq="D")
|
||
|
|
if frame_or_series is not DataFrame:
|
||
|
|
ts = ts["A"]
|
||
|
|
result = ts.first("10d")
|
||
|
|
assert len(result) == 10
|
||
|
|
|
||
|
|
result = ts.first("3M")
|
||
|
|
expected = ts[:"3/31/2000"]
|
||
|
|
tm.assert_equal(result, expected)
|
||
|
|
|
||
|
|
result = ts.first("21D")
|
||
|
|
expected = ts[:21]
|
||
|
|
tm.assert_equal(result, expected)
|
||
|
|
|
||
|
|
result = ts[:0].first("3M")
|
||
|
|
tm.assert_equal(result, ts[:0])
|
||
|
|
|
||
|
|
def test_first_last_raises(self, frame_or_series):
|
||
|
|
# GH#20725
|
||
|
|
obj = DataFrame([[1, 2, 3], [4, 5, 6]])
|
||
|
|
if frame_or_series is not DataFrame:
|
||
|
|
obj = obj[0]
|
||
|
|
|
||
|
|
msg = "'first' only supports a DatetimeIndex index"
|
||
|
|
with pytest.raises(TypeError, match=msg): # index is not a DatetimeIndex
|
||
|
|
obj.first("1D")
|
||
|
|
|
||
|
|
msg = "'last' only supports a DatetimeIndex index"
|
||
|
|
with pytest.raises(TypeError, match=msg): # index is not a DatetimeIndex
|
||
|
|
obj.last("1D")
|
||
|
|
|
||
|
|
def test_last_subset(self, frame_or_series):
|
||
|
|
ts = tm.makeTimeDataFrame(freq="12h")
|
||
|
|
if frame_or_series is not DataFrame:
|
||
|
|
ts = ts["A"]
|
||
|
|
result = ts.last("10d")
|
||
|
|
assert len(result) == 20
|
||
|
|
|
||
|
|
ts = tm.makeTimeDataFrame(nper=30, freq="D")
|
||
|
|
if frame_or_series is not DataFrame:
|
||
|
|
ts = ts["A"]
|
||
|
|
result = ts.last("10d")
|
||
|
|
assert len(result) == 10
|
||
|
|
|
||
|
|
result = ts.last("21D")
|
||
|
|
expected = ts["2000-01-10":]
|
||
|
|
tm.assert_equal(result, expected)
|
||
|
|
|
||
|
|
result = ts.last("21D")
|
||
|
|
expected = ts[-21:]
|
||
|
|
tm.assert_equal(result, expected)
|
||
|
|
|
||
|
|
result = ts[:0].last("3M")
|
||
|
|
tm.assert_equal(result, ts[:0])
|