what are the differences between *par , **par and *arg , **arg in python?

Question

what's the difference between *par , **par when we declare a function? and *arg , **arg when we call a function?

Answer 1

*args and **kwargs are special syntaxes for function arguments.

With *args ( can be anything instead of the word 'args' , it's just a convention) you tell the function to accept variable number of non-keyworded arguments.
See this example:
def func(*agrs):
for each in *args:
print(each)

Or you can also use it to take any number of extra arguments( even 0) other than your explicitly required arguments.
Ex:
def func(one, two, *argv) :
pass

func(1,2,3,4,5)
Here, one will take 1, two will take 2 and remaining other, 3,4,5, will be in *argv through which you can iterate.

**kwargs( or anything other than the word 'kwargs', just a convention) works the same way except it takes keyworded arguments. Understand it like sending a key-value pair to the function.
Ex:
def func(arg1, arg2, **kwargs) :
for key, value in kwargs:
print(key, value)

func('1', '2', a=1,b=2, c=3)
Here arguments other than '1' and '2' will get in the kwargs.

*par, **par, *arg, **arg are, again, just conventions.

Answer 2

thank you so much!