python-Custom Functions-parameters

One, custom function parameters

1. Type

(1) Position parameters

"X" is the positional parameter.

# !/usr/bin/env python # -*-coding:utf-8-*- # Author:dingkai # Mtime:2018/4/27 def Power (x):     = x * x    print(Result)

(2) Default parameters

"N" is the default parameter

# !/usr/bin/env python # -*-coding:utf-8-*- # Author:dingkai # Mtime:2018/4/27 def Power (x,n=1):    = 1 while     n > 0:        = n-1 c17/>= S * x    return s

(3) Variable parameters

"Numbers" is a mutable parameter, when the Calc function is called, the argument numbers is a list

def Calc (*numbers):     = 0    for in  numbers:        = sum + N * n    return sum

Print (Calc ([+]))

(4) Keyword parameters

"**every" is the keyword parameter

def person (name,age,**every):
    Print (' name: ', Name, ' Age: ', age, ' other: ', every)

Extra = {' City ': ' Beijing ', ' job ': ' OPS '}
#person (' Dingkai ', 25,city = extra[' city '],job = extra[' job '])
#person (' Dingkai ', 25,**extra)

(5) named keyword parameter

"*" followed by the name of the keyword

def person (name,age,*,city, Job):    print(name,age,city,job) #person ('  Dinkai', 26,city= ' Beijing ', job='OPS')

2. Precautions:

(1) is a required parameter before, the default parameter is behind, otherwise the Python interpreter will error (think about why the default parameters can not be placed in front of the required parameters);

(2) is how to set default parameters.

python-Custom Functions-parameters