Detailed explanation of function nesting method using Python

Python language allows when defining a function, its function body contains the complete definition of another function. This is what we usually call nested definition.

Instance 1:

def OutFun():         #定义函数OutFun()，
    m=3               #定义变量m=3;
    def InFun():      #在OutFun内定义函数InFun()
        n=4           #定义局部变量n=4
        print m+n     #m相当于函数InFun()的全局变量
     InFun()          #OutFun()函数内调用函数InFun()

Instance 2:

def InFun(m):
    n=4
    print m+n
def OutFun()
     m=4
     InFun(m)

Instance 2 first defines the function InFun(), and then defines the OutFun() function again. At this time, InFun( ) and OutFun() are two completely independent functions, and InFun() is called within the OutFun() function again; in fact, the nesting effect in instance 1 and instance 2 is the same, but in two different forms of expression.

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