问题
I have a method:
def foo(bar):
# ...
Is there a way to mark bar as constant? Such as "The value in bar cannot change" or "The object pointed to by bar cannot change".
回答1:
If bar is an inmutable object, bar won't change during the function.
You can also create your own constant object. The recipe here.
回答2:
No.
What's the point? If you're writing the function, isn't it up to you to make sure bar doesn't change? Or if you're calling the function, who cares?
来源：https://stackoverflow.com/questions/3081464/python-any-way-to-declare-constant-parameters