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Improve stubs for __pow__ #6287

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merged 9 commits into from
Nov 12, 2021
Merged

Improve stubs for __pow__ #6287

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867bb7a
Improve stubs for `__pow__`
AlexWaygood Nov 12, 2021
cdb959c
Apply black, address review
AlexWaygood Nov 12, 2021
c9786cf
Change return types to `Any`
AlexWaygood Nov 12, 2021
83b9b95
Remove overlapping overloads
AlexWaygood Nov 12, 2021
964511d
cleanup
AlexWaygood Nov 12, 2021
431741a
Address review
AlexWaygood Nov 12, 2021
7c57a5a
Complex duck-types for float
AlexWaygood Nov 12, 2021
a264b3f
Correct oversight
AlexWaygood Nov 12, 2021
226774a
More descriptive comments
AlexWaygood Nov 12, 2021
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8 changes: 4 additions & 4 deletions stdlib/builtins.pyi
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Original file line number Diff line number Diff line change
Expand Up @@ -283,15 +283,15 @@ class float:
@overload
def __pow__(self, __x: int, __mod: None = ...) -> float: ...
@overload
def __pow__(self, __x: float, __mod: None = ...) -> Any: ...
def __pow__(self, __x: float, __mod: None = ...) -> Any: ... # return type could be complex or float depending on x
def __radd__(self, __x: float) -> float: ...
def __rsub__(self, __x: float) -> float: ...
def __rmul__(self, __x: float) -> float: ...
def __rfloordiv__(self, __x: float) -> float: ...
def __rtruediv__(self, __x: float) -> float: ...
def __rmod__(self, __x: float) -> float: ...
def __rdivmod__(self, __x: float) -> tuple[float, float]: ...
def __rpow__(self, __x: float, __mod: None = ...) -> Any: ...
def __rpow__(self, __x: float, __mod: None = ...) -> float: ...
def __getnewargs__(self) -> tuple[float]: ...
def __trunc__(self) -> int: ...
if sys.version_info >= (3, 9):
Expand Down Expand Up @@ -1284,7 +1284,7 @@ if sys.version_info >= (3, 8):
@overload
def pow(base: float, exp: int, mod: None = ...) -> float: ...
@overload
def pow(base: float, exp: float, mod: None = ...) -> Any: ... # return type could be float or complex
def pow(base: float, exp: float, mod: None = ...) -> Any: ... # return type could be float or complex depending on x
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depending on exp

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It also depends on base. If the base is positive, then any power will also be positive. Complex numbers need a negative base and a negative power.

Maybe the whole "depending on" part should be deleted? It obviously depends on the arguments in some way, which is really all that needs to be said.

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It's worth spelling out the conditions... pow is like catnip for typeshed contributors, because everyone always starts off thinking only about positive integers :-)

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Hah, sorry about that @hauntsaninja

@overload
def pow(base: _SupportsPow2[_E, _T_co], exp: _E) -> _T_co: ...
@overload
Expand All @@ -1302,7 +1302,7 @@ else:
@overload
def pow(__base: float, __exp: int, __mod: None = ...) -> float: ...
@overload
def pow(__base: float, __exp: float, __mod: None = ...) -> Any: ... # return type could be float or complex
def pow(__base: float, __exp: float, __mod: None = ...) -> Any: ... # return type could be float or complex depending on x
@overload
def pow(__base: _SupportsPow2[_E, _T_co], __exp: _E) -> _T_co: ...
@overload
Expand Down