Error Global Variable not defined when importing class

Question

I am trying to implement a movement system where the player move\'s towards the click position. But I have been running into some problems with the arguments of the movement met

Answer 1

So after a bit more work I found the solution to my problem.

I only had two python files which both imported each other.

I had to create a third file to avoid this "circular" importation.

I made one file with my main code called main.py importing both the classes.py file and the variables.py file.

main.py:

import pygame, sys, variables
from pygame.locals import *
from classes import *

#Creating the characters
objects = []
objects.append(GameObject(variables.player, 80, 0))
for x in range(2):      #create 2 objects
    o = GameObject(variables.ennemi, x*40, 0)
    objects.append(o)

#game loop    
while True:
    for event in pygame.event.get(): #setting up quit
        if event.type == QUIT:
            pygame.quit()
            sys.exit()
        if event.type == MOUSEBUTTONDOWN : #initiating movement on click

            for o in objects:
                variables.screen.blit(variables.background, o.pos, o.pos) #erases players by bliting bg 
            for o in objects:
                o.move(event)
    pygame.display.update()
    pygame.time.delay(20)

classes.py:

import pygame, sys, variables
from pygame.locals import *

class GameObject:
    def __init__(self, image, height, speed):
        self.speed = speed
        self.image = image
        self.pos = image.get_rect().move(0, height) #initial placement

    def move_NS(self):
        self.pos = self.pos.move(0, self.speed)
        if self.pos.right > 600:
            self.pos.left = 0

    def move_EW(self):
        self.pos = self.pos.move(self.speed , 0)
        if self.pos.right > 600:
            self.pos.left = 0


    def move(self,event):#,mouse_pos, screen, background
            if event.type == MOUSEBUTTONDOWN:
                if pygame.mouse.get_pos()[1] > self.pos[1]:
                    variables.screen.blit(variables.background, self.pos, self.pos) #erases players by bliting bg 
                    self.speed = 1
                    self.move_NS() #moves player
                if pygame.mouse.get_pos()[0] > self.pos[0]:
                    variables.screen.blit(variables.background, self.pos, self.pos) #erases players by bliting bg 
                    self.speed = 1
                    self.move_EW() #moves player
                if pygame.mouse.get_pos()[1] < self.pos[1]:
                    variables.screen.blit(variables.background, self.pos, self.pos) #erases players by bliting bg 
                    self.speed = -1
                    self.move_NS() #moves player
                if pygame.mouse.get_pos()[0] < self.pos[0]:
                    variables.screen.blit(variables.background, self.pos, self.pos) #erases players by bliting bg 
                    self.speed = -1
                    self.move_EW() #moves player

                variables.screen.blit(self.image, self.pos) #draws player     

variables.py:

import pygame, sys
from pygame.locals import *
#Variables
screen = pygame.display.set_mode((640, 480))

#Importing Chars
player = pygame.image.load('green_hunter_small.png').convert()
player.set_colorkey((0,0,0)) #sets background colour to transparent

ennemi =  pygame.image.load('red_hunter_small.png').convert()
ennemi.set_colorkey((0,0,0))

#importing background
background = pygame.image.load('grass_map_640x640.png').convert()
screen.blit(background, (0, 0))

Hope it helps !