运行使用Pygame的游戏在pycharm中不起作用，但在从终端运行时将起作用

Question

When running a basic game, such as the one below, the screen will not update when ran in pycharm. Not even the background colour will load. However when run from terminal the program works fine. Why is this?

Note: I have installed Pygame using the pycharm package manager

import sys, pygame
pygame.init()

size = width, height = 320, 240
speed = [2, 2]
black = 0, 0, 0

screen = pygame.display.set_mode(size)

ball = pygame.image.load("ship.bmp")
ballrect = ball.get_rect()

while 1:
    for event in pygame.event.get():
        if event.type == pygame.QUIT: sys.exit()

    ballrect = ballrect.move(speed)
    if ballrect.left < 0 or ballrect.right > width:
        speed[0] = -speed[0]
    if ballrect.top < 0 or ballrect.bottom > height:
        speed[1] = -speed[1]

    screen.fill(black)
    screen.blit(ball, ballrect)
    pygame.display.flip()

Answer 1

Looks like interpreter problem, go to File->Settings->Project Interpreter->add(+ symbol) and install PyGame, or choose default(one on which it's running) enviroment. Should work