Scope of the Python variable

Local variables and global variables in the function body are not visible if they have duplicate names.

x =def  func (    x):print('x=', x)  #50     x = 2               print('x=', x)  #2 func (x) Print ('x=', x)      #  -

When you need to modify a global variable in a function, there is an error if there is no global keyword:

x =def  Run ():    print  x    = 2  run ()

The error is: unboundlocalerror:local variable ' x ' referenced before assignment

Add the Global keyword and then OK

x =def  Run ():    Global  x    = 2  run ()Print x     #2

Scope of the Python variable