2 авг. 2016 г. · If you're using typing (introduced in Python 3.5) you can use typing.Optional, where Optional[X] is equivalent to Union[X, None].

19 мая 2020 г. · I want to write something like this. def func_name(arg1, arg2, arg3 = 3) #this defines default value for optional argument arg3. def func_name( ...

4 июн. 2021 г. · The way to deal with mutable default arguments in Python is to set them to None. For example: def foo(bar=None): bar = [] if bar is None else bar return sorted ...

18 июн. 2018 г. · In short, you can't guarantee types in python. When you set the default value of pk=0, you make its default value an int.

1 мар. 2022 г. · You can set the default value of b to be a lambda function and then check if b is callable in the function block.

14 мая 2015 г. · A default value that's an empty list will refer to one specific variable each time you call it, instead of creating a new empty list every time.

15 нояб. 2011 г. · I want to pass a default argument to an instance method using the value of an attribute of the instance.

14 июл. 2021 г. · Define this: class Foo(Protocol): def __call__(self, x: int = ..., /) -> float: ... then type hint foo as Foo instead of Callable[[int], float].

3 апр. 2019 г. · You can grab the values of the default args: Get a function argument's default value? and come up with a way to define your function using those values.

18 февр. 2020 г. · What is the recommended way to solve the required vs. none required parameters? There is an example in Python docs for typing.Types and it shows ...