Improve stubs for __pow__
#6287
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Diff from mypy_primer, showing the effect of this PR on open source code: freqtrade (https://github.com/freqtrade/freqtrade.git)
+ freqtrade/templates/sample_hyperopt_loss.py:47: error: Argument 1 to "exp" has incompatible type "complex"; expected "Union[SupportsFloat, SupportsIndex]"
+ freqtrade/optimize/hyperopt_loss_short_trade_dur.py:48: error: Argument 1 to "exp" has incompatible type "complex"; expected "Union[SupportsFloat, SupportsIndex]"
pandas (https://github.com/pandas-dev/pandas.git)
+ pandas/io/stata.py:2990: error: Incompatible return value type (got "float", expected "int") [return-value]
vision (https://github.com/pytorch/vision.git)
+ torchvision/models/detection/backbone_utils.py:133: error: Argument 3 to "BackboneWithFPN" has incompatible type "List[float]"; expected "List[int]" [arg-type]
aiortc (https://github.com/aiortc/aiortc)
+ src/aiortc/rate.py:158: error: Incompatible types in assignment (expression has type "Union[float, complex]", variable has type "float")
+ src/aiortc/rate.py:440: error: Incompatible types in assignment (expression has type "complex", variable has type "float")
+ src/aiortc/rate.py:442: error: Incompatible types in assignment (expression has type "complex", variable has type "float")
prefect (https://github.com/PrefectHQ/prefect.git)
+ src/prefect/utilities/datetimes.py:51: error: Incompatible return value type (got "Union[timedelta, float]", expected "timedelta")
+ src/prefect/utilities/datetimes.py:51: error: Unsupported operand types for * ("None" and "float")
+ src/prefect/utilities/datetimes.py:51: note: Left operand is of type "Optional[timedelta]"
kornia (https://github.com/kornia/kornia.git)
+ kornia/geometry/transform/pyramid.py:203: error: Argument 1 to "sqrt" has incompatible type "complex"; expected "Union[SupportsFloat, SupportsIndex]" [arg-type]
paasta (https://github.com/yelp/paasta.git)
+ paasta_tools/utils.py:3553: error: Incompatible return value type (got "float", expected "int")
rich (https://github.com/willmcgugan/rich.git)
+ rich/filesize.py:50: error: Incompatible return value type (got "Tuple[float, str]", expected "Tuple[int, str]")
sympy (https://github.com/sympy/sympy.git)
+ sympy/core/evalf.py:300: error: Incompatible types in assignment (expression has type "float", variable has type "int")
+ sympy/core/evalf.py:623: error: Incompatible types in assignment (expression has type "float", variable has type "int")
+ sympy/core/evalf.py:1196: error: Incompatible types in assignment (expression has type "float", variable has type "int")
+ sympy/core/evalf.py:1354: error: Incompatible types in assignment (expression has type "float", variable has type "Symbol")
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Hmm, it's annoying that the type system doesn't have a way of specifying a positive integer. The new |
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Akuli
reviewed
Nov 12, 2021
stdlib/builtins.pyi
Outdated
| @@ -324,12 +329,12 @@ class complex: | |||
| def __add__(self, __x: complex) -> complex: ... | |||
| def __sub__(self, __x: complex) -> complex: ... | |||
| def __mul__(self, __x: complex) -> complex: ... | |||
| def __pow__(self, __x: complex, mod: None = ...) -> complex: ... | |||
| def __pow__(self, __x: complex | int | float, mod: None = ...) -> complex: ... | |||
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stdlib/builtins.pyi
Outdated
| @@ -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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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
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According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉 |
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Hooray! |
ikamensh
reviewed
Nov 16, 2021
| @@ -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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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
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