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TST: resample does not yield empty groups (#10603) #35799

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merged 3 commits into from
Aug 21, 2020
Merged

TST: resample does not yield empty groups (#10603) #35799

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TST: resample does not yield empty groups (#10603)
tkmz-n Aug 19, 2020
aba2a1f
apply the review comments
tkmz-n Aug 20, 2020
0340b6f
Merge branch 'master' into test-resample-empty-groups
tkmz-n Aug 21, 2020
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15 changes: 15 additions & 0 deletions pandas/tests/resample/test_timedelta.py
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Original file line number Diff line number Diff line change
Expand Up @@ -150,3 +150,18 @@ def test_resample_timedelta_edge_case(start, end, freq, resample_freq):
tm.assert_index_equal(result.index, expected_index)
assert result.index.freq == expected_index.freq
assert not np.isnan(result[-1])


def test_resample_with_timedelta_yields_no_empty_groups():
# GH 10603
df = pd.DataFrame(
np.random.normal(size=(10000, 4)),
index=pd.timedelta_range(start="0s", periods=10000, freq="3906250n"),
)
result = df.loc["1s":, :].resample("3s").apply(lambda x: len(x))

expected = pd.DataFrame(
[[768.0] * 4] * 12 + [[528.0] * 4],
index=pd.timedelta_range(start="1s", periods=13, freq="3s"),
)
tm.assert_frame_equal(result, expected)