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ENH: support argmin/max, idxmin/max with object dtype #54109

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merged 1 commit into from
Jul 17, 2023

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jbrockmendel
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Agreed upon in yesterday's call.

@@ -1070,27 +1071,89 @@ def test_timedelta64_analytics(self):
(Series(["foo", "foo", "bar", "bar", None, np.nan, "baz"]), TypeError),
],
)
def test_assert_idxminmax_raises(self, test_input, error_type):
def test_assert_idxminmax_empty_raises(self, test_input, error_type):
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It looks like error_type can be removed from the parametrization now?

ser3 = Series(["foo", "foo", "bar", "bar", None, np.nan, "baz"])
msg = "'>' not supported between instances of 'float' and 'str'"
with pytest.raises(TypeError, match=msg):
ser3.idxmax()
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So with object dtype, na-like values are not considered "missing" and rather object scalars so skipna=True has no effect here?

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the skipping part is done after the np.argmin/np.argmax is done, so that can still raise

@mroeschke mroeschke added the Dtype Conversions Unexpected or buggy dtype conversions label Jul 13, 2023
@mroeschke mroeschke added this to the 2.1 milestone Jul 17, 2023
@mroeschke mroeschke merged commit 394af8e into pandas-dev:main Jul 17, 2023
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@mroeschke
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Thanks @jbrockmendel

@jbrockmendel jbrockmendel deleted the enh-argmax branch July 17, 2023 16:47
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