I am trying to make QGraphicsItem jump with keys.

Here is code which reads pressed key from user (this is working):

I don't really know how I should create the jump_up() function here, this code won't work, because while -loops iterates so fast it goes
straight to the floor.

Qt Code: 
  1. def keyPressEvent(self, QKeyEvent):
  2.         self.key = QKeyEvent.key()
  3.         self.pressedkeys[self.key] = True
  4.  
  5.     def keyReleaseEvent(self, QKeyEvent):
  6.         self.key = QKeyEvent.key()
  7.         self.pressedkeys[self.key] = False
  8.  
  9.     def key_action(self):
  10.         for self.key, is_pressed in self.pressedkeys.items():
  11.  
  12.             if is_pressed:
  13.                 print("x")
  14.                 if self.key == QtCore.Qt.Key_D:
  15.  
  16.                     self.game.newplayer.move_forward()
  17.                     self.update()
  18.                 elif self.key == QtCore.Qt.Key_W:
  19.                     self.game.newplayer.jump_up() #calling here for jump function!
  20.                     self.update()
  21.  
  22. def jump_up(self):
  23.         grav = 5
  24.         self.item.moveBy(0, self.jumpacc)
  25.         while self.get_ylocation() < 0: #while rect is not touching the floor move the rect towards floor
  26.             self.item.moveBy(0, grav)
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