Python Learning: Scopes

A: First look at a small program

<strong><span style= "FONT-SIZE:18PX;" >k = 0;def Changek ():    k = ten; Changek () Print k</span></strong>

define a variable K

Define a function Changex

Within Changex, assign 10 to K

Print X

Execution results are: 0

Note: K is a global variable, and another local variable is declared in Changex. This k non-K, after the execution of Changex, the function of the inside of the K disappears. Similar to Java.

Second: If a global variable is used inside a function

<strong><span style= "FONT-SIZE:18PX;" >k = 0;def Changek ():    global k    k = 10changek () print k</span></strong>

Three: summary:

1. Global---Define variables as globals. You can change the value of a variable within a function by defining it as a global variable.
2. A global statement can define multiple variables at the same time, such as Global X, Y, Z

Python Learning: Scopes