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Is there any difference between parameters starting with underscore and normal parameters in python ?
eg:
def fun1(_data, _val):
....
....
def fun2(data, val):
....
....
Why I asked this question is because, in pycharm I could see the parameter data as blurred (It wasn't using anywhere) and the parameter _data as non-blurred (which was also not using anywhere in the function)
There is no difference in practice, and for function parameters you wouldn't really do this.
In python, there is a convention that a single underscore means the var/method is private, so _data should not be used by 3rd party apps. You'd often use this for e.g variables only available within a class.
Double underscore vars, e.g. __data is just an extra level of "don't use this from outside the class".
Usually, you'd use these to indicate to other devs that they shouldn't access eg. classname._var, but you would instead provide some kind of getter or setter method instead.
