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REGR: change in Series.astype(str) behavior for None #36904

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itholic opened this issue Oct 6, 2020 · 2 comments · Fixed by #37034
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REGR: change in Series.astype(str) behavior for None #36904

itholic opened this issue Oct 6, 2020 · 2 comments · Fixed by #37034
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Regression Strings
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1.1.4

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@itholic
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@itholic itholic commented Oct 6, 2020

Question about pandas

Let's say we have a Series with None like the below.

pser = pd.Series(["hi", "hi ", " ", " \t", "", None], name="x")

print(pser)
0      hi
1     hi
2
3      \t
4
5    None
Name: x, dtype: object

the last value is None, but it is casted to nan after using astype with str parameter.

print(pser.astype(str))
0     hi
1    hi
2
3     \t
4
5    nan
Name: x, dtype: object

Is it intended behavior in pandas 1.1.1. ??

Thanks :)
@dsaxton dsaxton changed the title QST: is the new behavior of Series.asof for None after v1.1.1 intended? QST: is the new behavior of Series.astype for None after v1.1.1 intended? Oct 7, 2020
@dsaxton
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@dsaxton dsaxton commented Oct 7, 2020

Thanks @itholic, this seems like a regression and is due to #35519

cc @topper-123

@dsaxton dsaxton changed the title QST: is the new behavior of Series.astype for None after v1.1.1 intended? REGR: change in Series.astype(str) behavior for None Oct 7, 2020
@dsaxton dsaxton added this to the 1.1.4 milestone Oct 7, 2020
@itholic
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@itholic itholic commented Oct 7, 2020

Thanks, @dsaxton :)

@itholic itholic mentioned this issue Oct 7, 2020
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@dsaxton dsaxton mentioned this issue Oct 10, 2020
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REGR: Fix casting of None to str during astype
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@dsaxton @itholic