Python method/function arguments starting with asterisk and dual asterisk

Question

I am not able understand where does these type of functions are used and how differently these arguments work from the normal arguments. I have encountered them many time but never got chance to understand them properly.

Ex:

def method(self, *links, **locks):
    #some foo
    #some bar
    return

I know i could have search the documentation but i have no idea what to search for.

Asked By: Shiv Deepak

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Source

Answer 1

The *args and **keywordargs forms are used for passing lists of arguments and dictionaries of arguments, respectively. So if I had a function like this:

def printlist(*args):
    for x in args:
        print(x)

I could call it like this:

printlist(1, 2, 3, 4, 5)  # or as many more arguments as I'd like

For this

def printdict(**kwargs):
    print(repr(kwargs))

printdict(john=10, jill=12, david=15)

*args behaves like a list, and **keywordargs behaves like a dictionary, but you don’t have to explicitly pass a list or a dict to the function.

See this for more examples.

Answered By: Rafe Kettler

Python method/function arguments starting with asterisk and dual asterisk

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