70 lines
1.6 KiB
Python
70 lines
1.6 KiB
Python
|
import numpy as np
|
||
|
|
import pytest
|
||
|
|
|
||
|
|
from pandas import Series
|
||
|
|
import pandas._testing as tm
|
||
|
|
|
||
|
|
|
||
|
|
def test_mask():
|
||
|
|
# compare with tested results in test_where
|
||
|
|
s = Series(np.random.randn(5))
|
||
|
|
cond = s > 0
|
||
|
|
|
||
|
|
rs = s.where(~cond, np.nan)
|
||
|
|
tm.assert_series_equal(rs, s.mask(cond))
|
||
|
|
|
||
|
|
rs = s.where(~cond)
|
||
|
|
rs2 = s.mask(cond)
|
||
|
|
tm.assert_series_equal(rs, rs2)
|
||
|
|
|
||
|
|
rs = s.where(~cond, -s)
|
||
|
|
rs2 = s.mask(cond, -s)
|
||
|
|
tm.assert_series_equal(rs, rs2)
|
||
|
|
|
||
|
|
cond = Series([True, False, False, True, False], index=s.index)
|
||
|
|
s2 = -(s.abs())
|
||
|
|
rs = s2.where(~cond[:3])
|
||
|
|
rs2 = s2.mask(cond[:3])
|
||
|
|
tm.assert_series_equal(rs, rs2)
|
||
|
|
|
||
|
|
rs = s2.where(~cond[:3], -s2)
|
||
|
|
rs2 = s2.mask(cond[:3], -s2)
|
||
|
|
tm.assert_series_equal(rs, rs2)
|
||
|
|
|
||
|
|
msg = "Array conditional must be same shape as self"
|
||
|
|
with pytest.raises(ValueError, match=msg):
|
||
|
|
s.mask(1)
|
||
|
|
with pytest.raises(ValueError, match=msg):
|
||
|
|
s.mask(cond[:3].values, -s)
|
||
|
|
|
||
|
|
|
||
|
|
def test_mask_casts():
|
||
|
|
# dtype changes
|
||
|
|
ser = Series([1, 2, 3, 4])
|
||
|
|
result = ser.mask(ser > 2, np.nan)
|
||
|
|
expected = Series([1, 2, np.nan, np.nan])
|
||
|
|
tm.assert_series_equal(result, expected)
|
||
|
|
|
||
|
|
|
||
|
|
def test_mask_casts2():
|
||
|
|
# see gh-21891
|
||
|
|
ser = Series([1, 2])
|
||
|
|
res = ser.mask([True, False])
|
||
|
|
|
||
|
|
exp = Series([np.nan, 2])
|
||
|
|
tm.assert_series_equal(res, exp)
|
||
|
|
|
||
|
|
|
||
|
|
def test_mask_inplace():
|
||
|
|
s = Series(np.random.randn(5))
|
||
|
|
cond = s > 0
|
||
|
|
|
||
|
|
rs = s.copy()
|
||
|
|
rs.mask(cond, inplace=True)
|
||
|
|
tm.assert_series_equal(rs.dropna(), s[~cond])
|
||
|
|
tm.assert_series_equal(rs, s.mask(cond))
|
||
|
|
|
||
|
|
rs = s.copy()
|
||
|
|
rs.mask(cond, -s, inplace=True)
|
||
|
|
tm.assert_series_equal(rs, s.mask(cond, -s))
|