function parameters in Python

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Example 1:

def F (a,b=1,*x,c=9,d,**y): ...      Print ([a,b,x,y,c,d]) ...

Example 2:

def F (a,*, c,d): ...      Print (a,c,d) ...

The order of the parameter definitions must be: required, default, variable, named keyword, and keyword parameters.

A: Positional parameters must be passed in

B: The default parameter can not be passed in, but it is different from the default value of other types

X: Variable parameters are not passed in, default () tuple type, can be passed in multiple, type can be different

*,c,d: The named keyword parameter must pass in, can set the default value, if there is a mutable parameter in front of it, can omit *, pass in the form "Variable name = value"

**y: keyword parameter is not passed in, default to {} dictionary type, can pass in multiple values, in x=1 format, (key value pair)

function parameters in Python