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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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39 changes: 28 additions & 11 deletions stdlib/builtins.pyi
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Original file line number Diff line number Diff line change
Expand Up @@ -221,9 +221,13 @@ class int:
def __rmod__(self, __x: int) -> int: ...
def __rdivmod__(self, __x: int) -> tuple[int, int]: ...
@overload
def __pow__(self, __x: Literal[2], __modulo: int | None = ...) -> int: ...
def __pow__(self, __x: int, __modulo: Literal[0]) -> NoReturn: ...
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isn't result of x ** 0 == 1?

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This is pow(1, 1, 0):

In [4]: pow(1, 1, 0)

Traceback (most recent call last):
  File "/main_instance_shell/jelle/venv/lib/python3.6/site-packages/IPython/core/interactiveshell.py", line 3343, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-4-23a0b67588cd>", line 1, in <module>
    pow(1, 1, 0)
ValueError: pow() 3rd argument cannot be 0

@overload
def __pow__(self, __x: int, __modulo: int | None = ...) -> Any: ... # Return type can be int or float, depending on x.
def __pow__(self, __x: Literal[2, 3, 4, 5], __modulo: int | None = ...) -> int: ...
# positive x -> int; negative x -> float
# return type must be Any as `int | float` causes too many false-positive errors
@overload
def __pow__(self, __x: int, __modulo: int | None = ...) -> Any: ...
def __rpow__(self, __x: int, __mod: int | None = ...) -> Any: ...
def __and__(self, __n: int) -> int: ...
def __or__(self, __n: int) -> int: ...
Expand Down Expand Up @@ -276,9 +280,12 @@ class float:
def __truediv__(self, __x: float) -> float: ...
def __mod__(self, __x: float) -> float: ...
def __divmod__(self, __x: float) -> tuple[float, float]: ...
def __pow__(
self, __x: float, __mod: None = ...
) -> float: ... # In Python 3, returns complex if self is negative and x is not whole
@overload
def __pow__(self, __x: int, __mod: None = ...) -> float: ...
# positive x -> float; negative x -> complex
# return type must be Any as `float | complex` causes too many false-positive errors
@overload
def __pow__(self, __x: float, __mod: None = ...) -> Any: ...
def __radd__(self, __x: float) -> float: ...
def __rsub__(self, __x: float) -> float: ...
def __rmul__(self, __x: float) -> float: ...
Expand Down Expand Up @@ -1271,25 +1278,35 @@ class _SupportsPow3(Protocol[_E, _M, _T_co]):

if sys.version_info >= (3, 8):
@overload
def pow(base: int, exp: int, mod: None = ...) -> Any: ... # returns int or float depending on whether exp is non-negative
def pow(base: int, exp: int, mod: Literal[0]) -> NoReturn: ...
# int base & positive-int exp -> int; int base & negative-int exp -> float
# return type must be Any as `int | float` causes too many false-positive errors
@overload
def pow(base: int, exp: int, mod: None = ...) -> Any: ...
@overload
def pow(base: int, exp: int, mod: int) -> int: ...
@overload
def pow(base: float, exp: float, mod: None = ...) -> float: ...
def pow(base: float, exp: int, mod: None = ...) -> float: ...
# float base & float exp could return float or complex
# return type must be Any as `float | complex` causes too many false-positive errors
@overload
def pow(base: float, exp: float, mod: None = ...) -> Any: ...
@overload
def pow(base: _SupportsPow2[_E, _T_co], exp: _E) -> _T_co: ...
@overload
def pow(base: _SupportsPow3[_E, _M, _T_co], exp: _E, mod: _M) -> _T_co: ...

else:
@overload
def pow(
__base: int, __exp: int, __mod: None = ...
) -> Any: ... # returns int or float depending on whether exp is non-negative
def pow(__base: int, __exp: int, __mod: Literal[0]) -> NoReturn: ...
@overload
def pow(__base: int, __exp: int, __mod: None = ...) -> Any: ...
@overload
def pow(__base: int, __exp: int, __mod: int) -> int: ...
@overload
def pow(__base: float, __exp: float, __mod: None = ...) -> float: ...
def pow(__base: float, __exp: int, __mod: None = ...) -> float: ...
@overload
def pow(__base: float, __exp: float, __mod: None = ...) -> Any: ...
@overload
def pow(__base: _SupportsPow2[_E, _T_co], __exp: _E) -> _T_co: ...
@overload
Expand Down