[Python] How can I change this variable [duplicate]

if event.key == pygame.KEYDOWN:
if event.key == pygame.K_UP:
playerImg = pygame.image.load(`something.png`)
if playerImg == pygame.image.load`ship2.png`):
playerImg = pygame.image.load(`ship2l.png`)


(if I changed the playerImg somewhere how can I do this?)

python-pygame

beacuse I don`t know

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