62- variable scope

 

Variable scope, local and global:

= 20 the X-   # the X-define global variables from the beginning to the end of the program, has been available visible. 

DEF foo ():
     Print (X) 

foo () 

DEF bar (): 
    X = 50   # where X is a local variable, global variable obscured, does not affect the values of global variables. 
    Print (X) 

bar ()   # X -> 50 
Print (X)   # X -> 20 is 

DEF AAA ():
     Global X   # global variable is used in the local 
    X = 100   # global variable X reassign 100 
    Print (X)   # X -> 100 

AAA () 

Print (X)   # X -> 100

Output results:

20
50
20
100
100