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BUG: no apply to empty df in Styler #45383

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Merged
attack68 merged 3 commits into from
Jan 17, 2022
Merged

BUG: no apply to empty df in Styler #45383

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0f3b2e4
whats new
attack68 Jan 15, 2022
f81a376
doc string replacement
attack68 Jan 16, 2022
8a5ca7b
use existing logic
attack68 Jan 16, 2022
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3 changes: 2 additions & 1 deletion doc/source/whatsnew/v1.5.0.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ Styler
^^^^^^

- New method :meth:`.Styler.to_string` for alternative customisable output methods (:issue:`44502`)
- Various bug fixes, see below.

.. _whatsnew_150.enhancements.enhancement2:

Expand Down Expand Up @@ -206,7 +207,7 @@ ExtensionArray

Styler
^^^^^^
-
- Minor bug when attempting to apply styling functions to an empty DataFrame subset (:issue:`45313`)
-

Other
Expand Down
4 changes: 3 additions & 1 deletion pandas/io/formats/style.py
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Expand Up @@ -1486,7 +1486,9 @@ def _apply(
subset = slice(None) if subset is None else subset
subset = non_reducing_slice(subset)
data = self.data.loc[subset]
if axis is None:
if data.empty:
result = DataFrame()
elif axis is None:
result = func(data, **kwargs)
if not isinstance(result, DataFrame):
if not isinstance(result, np.ndarray):
Expand Down
6 changes: 6 additions & 0 deletions pandas/tests/io/formats/style/test_style.py
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Expand Up @@ -1548,3 +1548,9 @@ def test_col_trimming_hide_columns():
assert ctx["head"][0][c + 2]["is_visible"] == vals[1]

assert len(ctx["body"][0]) == 6 # index + 2 hidden + 2 visible + trimming col


def test_no_empty_apply(mi_styler):
# 45313
mi_styler.apply(lambda s: ["a:v;"] * 2, subset=[False, False])
mi_styler._compute()