Python function variable parameter definition and its parameter passing Method Example

In this paper, we describe the variable parameter definition of Python function and its parameter passing mode. Share to everyone for your reference. The specific analysis is as follows:

The parameters of a function in Python are defined in the following form:

1. Func (*args)

The passed in parameter is in the form of a tuple in args, such as:

def func (*args):   

2. Func (**kwargs)

The arguments passed in are in the form of a dictionary in args, such as:

def func (**kwargs):   

3, can also be mixed with

Func (*args, **kwargs)

The order of incoming must be the same as the order of the definition, here is the indefinite parameter list, and then the keyword parameter dictionary, such as:

def func (*args, **kwargs):   print args   print Kwargs >>> func (1, 2, 3) {} >>> func (*[1,2,3 ] (1, 2, 3) {} >>> func (a = 1, b = 2, c = 3) () {' A ': 1, ' C ': 3, ' B ': 2} >>> func (**{' a ': 1, ' B ': 2, ' C ': 3}) {' A ': 1, ' C ': 3, ' B ': 2} >>> func (a = 4, b=5, c=6) (1, 2, 3) {' A ': 4, ' C ': 6, ' B ': 5} #这样跳跃传递是不行的 & gt;>> func (a=4, b=5, c=6, 7) syntaxerror:non-keyword arg after keyword arg

Hopefully this article will help you with Python programming.

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