How to use global in python

This article mainly introduces how to use global in python, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

1. You can access variables in scope other than local function variables, but you cannot rebind to new parameters without further syntax.

Instead, the assignment creates a new local variable rather than affecting the variable in the parent scope.

Global_var1 = [] global_var2 = 1 def func (): # This is OK: It's just accessing, not rebinding global_var1.append (4) # This won't affect global_var2. Instead it creates a new variable global_var2 = 2 local1 = 4 def embedded_func (): # Again, this doen't affect func's local1 variable. It creates a # new local variable also called local1 instead. Local1 = 5 print local1 embedded_func () # Prints 5 print local1 # Prints 4

2. In order to actually modify the binding of global variables within the scope of the function, you need to use the global keyword to specify that the variable is global.

Global_var = 4def change_global (): global global_var global_var = global_var + 1 Thank you for reading this article carefully. I hope the article "how to use global in python" shared by the editor will be helpful to you. At the same time, I hope you will support us and pay attention to the industry information channel. More related knowledge is waiting for you to learn!