can you change a global variable in a function python code example

Example 1: python global variables

global var1
var1 = 'whatever'

Example 2: how to make variable global in python

global variable
variable = 'whatever'

Example 3: global variable python

#it is best not to use global variables in a function
#(pass it as an argument)
a = 'This is global a'
def yourFunction():
    global a
    return a[0:2]