A detailed description of function nesting methods using Python

The Python language allows the function body to have a complete definition of another function when defining a function, which is what we typically call nested definitions.

Example 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 () global variable     infun ()          Call Function Infun () in #OutFun () function

Example 2:

def infun (m):    n=4    print m+ndef outfun ()     m=4     infun (m)

Instance 2 first defines the function Infun (), and then again defines the Outfun () function, at which time Infun () and Outfun () are completely independent of the two functions, again Outfun () function calls Infun (), in fact, instance 1 and instance 2 have the same nesting effect, Just two different forms of expression.