Typing Tutor Game

# game.py
import pygame
from play import GamePlay
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class TypingTutor():
    def __init__(self):
        pygame.init() # initialises Pygame libraries
        self.screen = pygame.display.set_mode((WIDTH, HEIGHT))
        self.disp_surf = self.init_display()
        self.size = WIDTH, HEIGHT
        self.running = True if self.disp_surf else False
        self.state = START
        self.font = pygame.font.Font('Consolas Bold.ttf', 36)
        self.game = None
        return
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    def execute(self):
        # Event loop
        while self.running:
            self.check_events()
            if self.state == PLAYING:
                self.game = GamePlay(self.screen)
                self.game.execute()
                self.state += 1
            else:
                self.render()
        return

# play.py
import pygame

# Colours        R    G    B
BLUE        = (  0,   0, 128)
WHITE       = (255, 255, 255)

class GamePlay():
    def __init__(self, screen):
        self.screen = screen
        pygame.init()
        self.disp_surf = pygame.Surface(self.screen.get_size()).convert()
        self.width, self.height = screen.get_size()
        self.font =  pygame.font.Font('Consolas Bold.ttf', 16)
        self.playing = True
        
    def execute(self):
        while self.playing:
            self.check_events()
            self.loop()
            self.render()
        return
    
    def check_events(self):
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
            elif event.type == pygame.KEYUP:
                if event.key == pygame.K_ESCAPE:
                    self.playing = False
        return
    
    def loop(self):
        pass
        
    def render(self):
        '''Render surface'''
        self.disp_surf.fill(BLUE) # Fill background

        # Draw some text
        self.draw_word('Playing...', WHITE, (0, 0))
        
        # Blit everything to screen
        self.screen.blit(self.disp_surf, (0,0))
        pygame.display.flip()
        return

    def draw_word(self, text, colour, coord):
        '''Display given text'''
        text_surf = self.font.render(text, True, colour)
        text_rect = text_surf.get_rect()
        text_rect.topleft = coord
        self.disp_surf.blit(text_surf, text_rect)
        return