Efanzh <efa...@gmail.com> added the comment:
I agree that this doesn’t fix any bug. But is is easy to make mistakes by using
mutable default values (See
https://docs.python-guide.org/writing/gotchas/#mutable-default-arguments). Both
PyCharm and pylint show warnings about mutable default arguments even there is
no bug in the code.
Using `{}` as default value, by looking at the function signature, I might
wonder whether this argument stays the same on each function call, since it is
mutable. But by using `None` as default value, I am know this argument will
always be `None` on each function call. Using `None` as default value makes the
function interface more easy to understand.
Also, if some new Python coders saw `[]` or `{}` being used as default values
in the standard library, they might think “I’ll do it too since the standard
library does it”.
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<https://bugs.python.org/issue38654>
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