What's causing this variable referenced before assignment error?

Question

This is the code that I am working with:

import pygame

global lead_x
global lead_y
global lead_x_change
global lead_y_change

lead_x = 300
lead_y = 300
lead_x_c         


        

Answer 1

If you need to modify a global variable from inside a function you need to use the global keyword: global lead_x in this case, before any assignment