config.json

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+{
+    "screen":
+    {
+        "res":[1120, 780],
+        "fullscreen": false
+    }
+}

main.py

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+import pygame
+import sys
+import json
+import time
+
+def setUp(config):
+    pygame.init()
+    if config["fullscreen"]:
+        screen = pygame.display.set_mode(config["res"], pygame.FULLSCREEN)
+    else:
+        screen = pygame.display.set_mode(config["res"])
+    clock = pygame.time.Clock()
+    running = True
+    return screen, clock, running
+
+def readConfig():
+    with open('config.json', 'r') as c:
+        json_data = c.read()
+    return json.loads(json_data)
+
+def main():
+    config = readConfig()
+    screen, clock, running = setUp(config["screen"])
+    while running:
+        for event in pygame.event.get():
+            if event.type == pygame.QUIT:
+                running = False 
+            # fill the screen with a color to wipe away anything from last frame
+            screen.fill("purple")
+
+            # RENDER YOUR GAME HERE
+
+            # flip() the display to put your work on screen
+            pygame.display.flip()
+
+            clock.tick(60)  # limits FPS to 60
+
+    pygame.quit()
+
+if __name__ == '__main__':
+    main()