Как заставить объект исчезнуть через некоторое время?

Question

Я пытаюсь сделать игру, в которой я могу нажать пробел, чтобы выстрелить.Здесь много лагов.Я пытаюсь понять, как заставить пулю исчезнуть после выхода из экрана.Здесь также много лагов.Я почти уверен, что лаг от пули не сбрасывает экран после достижения конца.Я импортировал время, но я просто не могу понять, как использовать время.

Вот что я пытался:

# Importing GUI library
import turtle 
import time

bullets = []
bullets2 = []
# Set speed, GUI, creates new turtle
t_speed = 5
bullet_speed = 50000
screen = turtle.Screen()
t = turtle.Turtle()
t2=turtle.Turtle()
screen.setup(700, 400)

# Arrow Keys as turtle movement
def forward():
  t.forward(t_speed)
def left():
  t.left(t_speed)
def right():
  t.right(t_speed)
def back():
  t.back(t_speed)
def forward2():
  t2.forward(t_speed)
def left2():
  t2.left(t_speed)
def right2():
  t2.right(t_speed)
def back2():
  t2.back(t_speed)

# Shoot a turtle from a turtle
def shoot():
  # sets position of bullet at x and y of t
  # spawn turtle at x and y
  bullet = turtle.Turtle()
  bullet.ht()
  bullet.penup()
  # Launch him
  screen.addshape("uparrow.png")
  bullet.shape("uparrow.png")
  bullet.setheading(t.heading())
  bullet.setposition(t.xcor(), t.ycor())
  bullet.st()
  bullet.forward(700)
  bullet.speed(bullet_speed)
  #TODO: Make less laggy by deleting bullet object after x seconds
def shoot2():
  # set a timer
  current = time.localtime().tm_sec
  # sets position of bullet at x and y of t
  # spawn turtle at x and y
  bullet = turtle.Turtle()
  bullets2.append(bullet)
  bullet.ht()
  bullet.penup()
  # Launch him
  screen.addshape("uparrow.png")
  bullet.shape("uparrow.png")
  bullet.setheading(t2.heading())
  bullet.setposition(t2.xcor(), t2.ycor())
  bullet.st()
  bullet.forward(700)
  bullet.speed(bullet_speed)
  #TODO: Make less laggy by deleting bullet object after x seconds
  #new = time.localtime().tm_sec
  #if new > current + 3:
    #bullets2.

def playGame():
  # TODO: Health Bar

  # TODO: Characters

  t.penup()
  t.setheading(5)
  t2.penup()
  # TODO
  still_alive = True
  # Movement
  screen.onkey(back, "Down")
  screen.onkey(left, "Left")
  screen.onkey(right, "Right")
  screen.onkey(shoot, "space")
  screen.onkey(forward, "Up")
  screen.onkey(back2, "S")
  screen.onkey(left2, "A")
  screen.onkey(right2, "D")
  screen.onkey(shoot2, "Z")
  screen.onkey(forward2, "W")
  # Game Engine
  screen.listen()
  t.mainloop()

def gameStart():
  # Title
  print("Welcome to my game!")
  # Menu; press Q to quit, Press p to play
  startGame = True
  while startGame == True:
    inp = raw_input("Press p to play or Press q to quit")
    if inp == "q":
      exit()
    elif inp == "p":
      playGame()
      startGame = False
    else:
      print("Incorrect prompt")
  # Instructions
  print("Use Arrow Keys to move. Press space to shoot")

def main():
  gameStart()

if __name__ == "__main__":
  main()

Объект должен исчезнуть через некоторое время.

Answer 1

Ваша программа - это набор заблуждений, склеенных с плохим управлением кодом. Ваша пуля не только имеет задержку, но и блокирует все другие действия, пока она находится в движении! Давайте отбросим идею модуля времени и вместо этого воспользуемся собственными событиями таймера черепахи, чтобы действительно позволить пулям летать:

from turtle import Screen, Turtle

# Arrow Keys as turtle movement
def forward_1():
    player_1.forward(player_speed)

def back_1():
    player_1.back(player_speed)

def left_1():
    player_1.left(player_speed)

def right_1():
    player_1.right(player_speed)

def shoot_1():
    screen.onkey(None, "space")  # disable handler inside handler!
    shoot(player_1)
    screen.onkey(shoot_1, "space")

def forward_2():
    player_2.forward(player_speed)

def left_2():
    player_2.left(player_speed)

def right_2():
    player_2.right(player_speed)

def back_2():
    player_2.back(player_speed)

def shoot_2():
    screen.onkey(None, "z")
    shoot(player_2)
    screen.onkey(shoot_2, "z")

def travel(bullet, milliseconds):
    bullet.forward(bullet_speed)

    if milliseconds:
        screen.ontimer(lambda b=bullet, s=milliseconds - 100: travel(b, s), 100)
    else:
        bullet.hideturtle()
        bullets.append(bullet)

# Shoot a bullet from a player
def shoot(player):
    # sets position of bullet at x and y of player
    # spawn turtle at x and y
    if bullets:
        bullet = bullets.pop(0)
    else:
        bullet = Turtle(visible=False)
        # bullet.shape("uparrow.png")
        bullet.shape('arrow')
        bullet.speed('fastest')
        bullet.penup()

    # Launch him
    bullet.color(player.fillcolor())
    bullet.setheading(player.heading())
    bullet.setposition(player.position())
    bullet.showturtle()

    travel(bullet, 2000)

bullets = []

# Set speed, GUI, creates new turtle
player_speed = 10
bullet_speed = 15

screen = Screen()
screen.setup(700, 400)
# screen.addshape("uparrow.png")

player_1 = Turtle('triangle')
player_1.speed('fastest')
player_1.color('red', 'pink')
player_1.penup()
player_1.setheading(90)

player_2 = Turtle('triangle')
player_2.speed('fastest')
player_2.color('blue', 'cyan')
player_2.penup()
player_2.setheading(270)

# Movement
screen.onkey(forward_1, "Up")
screen.onkey(back_1, "Down")
screen.onkey(left_1, "Left")
screen.onkey(right_1, "Right")
screen.onkey(shoot_1, "space")

screen.onkey(forward_2, "w")
screen.onkey(back_2, "s")
screen.onkey(left_2, "a")
screen.onkey(right_2, "d")
screen.onkey(shoot_2, "z")

# Game Engine
screen.listen()
screen.mainloop()