pygame not updating x and y

python pygame 
if zombie.x > player.x:
      zombie.x =- zombieVel

    if zombie.x < player.x:
      zombie.x =+ zombieVel

    if zombie.y > player.y:
      zombie.y =- zombieVel

    if zombie.y < player.y:
      zombie.y =+ zombieVel

The operators sohould be += and -= instead of =+ =- i think

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