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Use of *args and **kwargs

UlaDeia

Senior Developer

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Posted

As a result, I'm having trouble grasping the notion of *args and **kwargs.

So far, I have discovered:

*args = list of arguments - as positional arguments **kwargs = dictionary - whose keys become distinct keyword arguments and the values become values of these arguments

I'm not sure what programming task this would assist with.

Maybe:

Is it possible to pass lists and dictionaries as function parameters while also acting as a wildcard?

Is there a simple example of how *args and **kwargs are used?

In addition, the tutorial (source) I found just utilised the "*" and a variable name.

Are *args and **kwargs only placeholders, or do you actually utilise *args and **kwargs in the code?

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Alternate

stop take my rice

vip

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Replied

I'll give you the answer you're looking for- *args and **kwargs are most commonly used to create optional arguments for, say, functions.

 

A required argument is created and used like this:

def MyFunc(argument):
    return argument

# Usage

result = MyFunc(“Hello, World!”)
print(MyFunc)
# Hello, World!

If the function is to be called without that argument provided, an error will occur as it is required.

 

*args and **kwargs are used to make optional arguments, like this: (using **kwargs)

def MyFunc(argument, **kwargs):
    argument2 = kwargs.get(“argument2”, “defaultvalue”)
    return argument + argument2

# Usage

result = MyFunc(“Hello, “, argument2=“World!”)
# Hello, World!

I don't know how to use *args but I do know how to use **kwargs, I hope this is somewhat helpful.

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we are dead

Murz

PixelPenguin

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@87922 pretty sure he uses javascript, plus i mean sometimes even pro's mess up and need a little help or some insight :D

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Added

@87922 Sometimes it isn't that simple, some people have to take in information a certain way, maybe he couldn't find a good enough explanation for him online so he came to ask here :)

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