Kekoa Kekoa - 6 months ago 14
Python Question

Proper way to use **kwargs in Python

What is the proper way to use

**kwargs
in Python when it comes to default values?

kwargs
returns a dictionary, but what is the best way to set default values, or is there one? Should I just access it as a dictionary? Use get function?

class ExampleClass:
def __init__(self, **kwargs):
self.val = kwargs['val']
self.val2 = kwargs.get('val2')


A simple question, but one that I can't find good resources on. People do it different ways in code that I've seen and it's hard to know what to use.

Answer

You can pass a default value to get() for keys that are not in the dictionary:

self.val2 = kwargs.get('val2',"default value")

However, if you plan on using a particular argument with a particular default value, why not use named arguments in the first place?

def __init__(self, val2="default value", **kwargs):