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Fixed code breakage for return_type = tuples for axis = 0 #39375

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Fixed code breakage for return_type = tuples for axis = 0 #39375

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2 changes: 1 addition & 1 deletion pandas/core/apply.py
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Original file line number Diff line number Diff line change
Expand Up @@ -482,7 +482,7 @@ def wrap_results_for_axis(
return res

elif self.result_type is None and all(
isinstance(x, dict) for x in results.values()
isinstance(x, (dict, tuple)) for x in results.values()
):
# Our operation was a to_dict op e.g.
# test_apply_dict GH#8735, test_apply_reduce_to_dict GH#25196 #37544
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8 changes: 8 additions & 0 deletions pandas/tests/apply/test_frame_apply.py
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Expand Up @@ -131,6 +131,14 @@ def test_apply_funcs_over_empty(self, func):
expected = getattr(df, func)()
tm.assert_series_equal(result, expected)

def test_apply_return_type_none(self):
# GH 35518
df = DataFrame([["orig1", "orig2"], ["orig3", "orig4"]])
result = df.apply(func=lambda col: ("new1", "new2"))

expected = Series(data=[("new1", "new2"), ("new1", "new2")])
tm.assert_series_equal(result, expected)

def test_nunique_empty(self):
# GH 28213
df = DataFrame(columns=["a", "b", "c"])
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