Python Turtle Space Invaders 子弹没有击中入侵者

Question

总的来说，我对乌龟和 python 很陌生，所以如果我的代码看起来很乱，我深表歉意。

我目前正在编写太空入侵者的乌龟版本，我不明白为什么我的入侵者在击中乌龟时没有死。该代码似乎与我能找到的所有其他太空入侵者海龟程序相同。任何帮助将不胜感激。

import turtle

import random

import math

#### Player ####

player1 = turtle.Turtle()

player1.shape("arrow")

player1.color("white")

player1.speed(0)

player1.penup()

player1.setheading(90)

player1.setposition(0, -175)

player1.speed(4)

def move_right():

    x = player1.xcor()

    x += playerspeed

    if x > 210:

        x = 210

    player1.setx(x)

def move_left():

    x = player1.xcor()

    x -= playerspeed

    if x < -210:

        x = -210

    player1.setx(x)

bulletlist = []

def fire():

    if len(bulletlist) < 5:

        bulletlist.append(Bullet())

#### Window ####

win = turtle.Screen()

win.bgcolor("black")

win.tracer(2)

border_pen = turtle.Turtle()

border_pen.speed(0)

border_pen.color("white")

border_pen.penup()

border_pen.setposition(-225, -225)

border_pen.pensize(3)

border_pen.pendown()

for side in range(4):

    border_pen.fd(450)

    border_pen.lt(90)

border_pen.hideturtle()

### Invader ###

class Invader(turtle.Turtle):

    def __init__(self, xcor, ycor):

        turtle.Turtle.__init__(self)

        self.color("red")

        self.shape("turtle")

        self.penup()

        self.speed(0)

        self.setposition(xcor, ycor)

        self.setheading(270)

        self.speed(1)

        self.hit = 0

### Bullet ###

bulletstate = 1

class Bullet(turtle.Turtle):

    def __init__(self):

        turtle.Turtle.__init__(self)

        self.color("yellow")

        self.shape("arrow")

        self.shapesize(.5, 1)

        self.penup()

        self.speed(0)

        self.setheading(90)

        self.hideturtle()

        self.bulletspeed = 20

fire()

def bullet_movement():

    global firedb

    firedb = bulletlist[-1]

    firedb.speed(0)

    ybul = firedb.ycor()

    ybul += 10

    firedb.sety(ybul)

    if ybul > 195:

        firedb.hideturtle()