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TYP fixup overloads for reset_index #40200

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Merged
merged 6 commits into from
Mar 10, 2021
Merged

TYP fixup overloads for reset_index #40200

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53da46b
fixup overloads for reset_index
MarcoGorelli Mar 3, 2021
56fd378
another overload
MarcoGorelli Mar 3, 2021
1b977ce
add defaults for bool case
MarcoGorelli Mar 4, 2021
7b92ab1
Merge remote-tracking branch 'upstream/master' into fixup-reset-index
MarcoGorelli Mar 4, 2021
8b404bb
add types back to function signature
MarcoGorelli Mar 9, 2021
2360b56
Merge remote-tracking branch 'upstream/master' into fixup-reset-index
MarcoGorelli Mar 10, 2021
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51 changes: 46 additions & 5 deletions pandas/core/frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5145,9 +5145,7 @@ def set_index(
return frame

@overload
# https://github.com/python/mypy/issues/6580
# Overloaded function signatures 1 and 2 overlap with incompatible return types
def reset_index( # type: ignore[misc]
def reset_index(
self,
level: Optional[Union[Hashable, Sequence[Hashable]]] = ...,
drop: bool = ...,
Expand All @@ -5157,15 +5155,58 @@ def reset_index( # type: ignore[misc]
) -> DataFrame:
...

@overload
def reset_index(
self,
level: Optional[Union[Hashable, Sequence[Hashable]]],
drop: bool,
inplace: Literal[True],
col_level: Hashable = ...,
col_fill: Hashable = ...,
) -> None:
...

@overload
def reset_index(
self,
*,
drop: bool,
inplace: Literal[True],
col_level: Hashable = ...,
col_fill: Hashable = ...,
) -> None:
...

@overload
def reset_index(
self,
*,
level: Optional[Union[Hashable, Sequence[Hashable]]],
inplace: Literal[True],
col_level: Hashable = ...,
col_fill: Hashable = ...,
) -> None:
...

@overload
def reset_index(
self,
*,
inplace: Literal[True],
col_level: Hashable = ...,
col_fill: Hashable = ...,
) -> None:
...
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@simonjayhawkins simonjayhawkins Mar 9, 2021 •
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Is the last overload needed now? won't it fall back to the function definition if no overloads match?

updated: comment should have been on the next one.

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Pretty sure it's needed, see here for a toy example (uncomment the commented-out part and it'll pass)

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Commenting out the last overload leads to the same errors observed on master in the typing test from #40202 (comment)

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ah ok, and Revealed type is 'Any'. I thought that it fell back to the non-overloaded function with no matching overloads. maybe something changed in mypy or only does so under different conditions.

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only does so under different conditions

If I've understood correctly, this is it - see #39501 (comment)


@overload
def reset_index(
self,
level: Optional[Union[Hashable, Sequence[Hashable]]] = ...,
drop: bool = ...,
inplace: Literal[True] = ...,
inplace: bool = ...,
col_level: Hashable = ...,
col_fill: Hashable = ...,
) -> None:
) -> Optional[DataFrame]:
...

def reset_index(
Expand Down