Jumping with QGraphicsItem[Python]

[Nor1]

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.

def keyPressEvent(self, QKeyEvent):
        self.key = QKeyEvent.key()
        self.pressedkeys[self.key] = True
 
    def keyReleaseEvent(self, QKeyEvent):
        self.key = QKeyEvent.key()
        self.pressedkeys[self.key] = False
 
    def key_action(self):
        for self.key, is_pressed in self.pressedkeys.items():
 
            if is_pressed:
                print("x")
                if self.key == QtCore.Qt.Key_D:
 
                    self.game.newplayer.move_forward()
                    self.update()
                elif self.key == QtCore.Qt.Key_W:
                    self.game.newplayer.jump_up() #calling here for jump function!
                    self.update()
 
def jump_up(self):
        grav = 5
        self.item.moveBy(0, self.jumpacc)
        while self.get_ylocation() < 0: #while rect is not touching the floor move the rect towards floor
            self.item.moveBy(0, grav)

def keyPressEvent(self, QKeyEvent):
        self.key = QKeyEvent.key()
        self.pressedkeys[self.key] = True
        
    def keyReleaseEvent(self, QKeyEvent):
        self.key = QKeyEvent.key()
        self.pressedkeys[self.key] = False
    
    def key_action(self):
        for self.key, is_pressed in self.pressedkeys.items():
            
            if is_pressed:
                print("x")
                if self.key == QtCore.Qt.Key_D:

                    self.game.newplayer.move_forward()
                    self.update()
                elif self.key == QtCore.Qt.Key_W:
                    self.game.newplayer.jump_up() #calling here for jump function!
                    self.update()

def jump_up(self):
        grav = 5
        self.item.moveBy(0, self.jumpacc)
        while self.get_ylocation() < 0: #while rect is not touching the floor move the rect towards floor
            self.item.moveBy(0, grav)

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[ChrisW67]

What should jump_up() do? Are you expecting a smooth transition over time up the screen followed by one downward?