First of a serie of posts with modular components for pygame, with ready to be used and easy to modify to adapt code for your own projects.

The first components is a module to move a rectangle.

Moving a rectangle

import pygame, sys, random
from pygame.locals import *
# Set up pygame.
pygame.init()
mainClock = pygame.time.Clock()

# Set up the window.
WINDOWWIDTH = 400
WINDOWHEIGHT = 400
windowSurface = pygame.display.set_mode((WINDOWWIDTH, WINDOWHEIGHT), 0, 32)
pygame.display.set_caption('Collision Detection')





def movements():
    player = pygame.Rect(0, 0, 20, 20)

    moveLeft = False
    moveRight = False
    moveUp = False
    moveDown = False

    MOVESPEED = 1
    while True:
    # Check for events.
        for event in pygame.event.get():
            if event.type == QUIT:
                pygame.quit()
                sys.exit()
            if event.type == KEYDOWN:
                # Change the keyboard variables.
                if event.key == K_LEFT or event.key == K_a:
                    moveRight = False
                    moveLeft = True
                if event.key == K_RIGHT or event.key == K_d:
                    moveLeft = False
                    moveRight = True
                if event.key == K_UP or event.key == K_w:
                    moveDown = False
                    moveUp = True
                if event.key == K_DOWN or event.key == K_s:
                    moveUp = False
                    moveDown = True
            if event.type == KEYUP:
                if event.key == K_ESCAPE:
                    pygame.quit()
                    sys.exit()
                if event.key == K_LEFT or event.key == K_a:
                    moveLeft = False
                if event.key == K_RIGHT or event.key == K_d:
                    moveRight = False
                if event.key == K_UP or event.key == K_w:
                    moveUp = False
                if event.key == K_DOWN or event.key == K_s:
                    moveDown = False

    # Draw the white background onto the surface.
        windowSurface.fill((255, 255, 255))

        # Move the player.
        if moveDown and player.bottom < WINDOWHEIGHT:
            player.top += MOVESPEED
        if moveUp and player.top > 0:
            player.top -= MOVESPEED
        if moveLeft and player.left > 0:
            player.left -= MOVESPEED
        if moveRight and player.right < WINDOWWIDTH:
            player.right += MOVESPEED

        # Draw the player onto the surface.
        pygame.draw.rect(windowSurface, (0, 0, 0), player)
        # Draw the window onto the screen.
        pygame.display.update()
        mainClock.tick(120)

if __name__ == "__main__":
    movements()

Use this on his own or importing it from a main file like this:

from components import move_rectangle as movements


movements.movements()

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