How to add global variables?

Answer 1

Simply when you define a variable inside a function you can't acess to it outside the function and if you define a variable outside the function thats global variable and you access to it inside the function , example:

def foo():
x='local'

Print(x)

This gives you error becuase x is local and tried to access to it outside the function

And :

x="global"

def foo():
print(x)

It prints x beacause x is global as you called it

Answer 2

def f():
global x = 123
print(x) # it's print 123