Getting started with Python: local variables

A variable defined in a subroutine is called a local variable, and a variable defined at the beginning of the program is called a global variable.

The global variable scope is the entire program, and the local variable scope is the subroutine that defines the variable.

When a global variable has the same name as a local variable: Local variables work within subroutines that define local variables; global variables work elsewhere

Example 1:

def change_name (name):

Print ("Before Change", name)

Name= "Zhangyan" #这个函数就是这个变量的作用域

Print ("After Change", name)

Name= "Zhangyan"

Change_name (name)

Print (name)

Result: Name is still Zhangyan (reason: The local variable cannot modify the value of the global variable)

Example 2:

def change_name (name):

Age=28

Print (age)

Result: Error, age undefined

Example 3:

School= "Oldboy"

def change_name (name):

Global school #局部变量前加上global变为全局变量, you can modify the value of the same variable name outside the function

School= ' Mage Linux '

Print (school)

Result: School for "Mage Linux"

　　

Getting started with Python: local variables