的Python KeyError异常，但没有字典

Question

我一直在试图运行我的程序，但我每次做的时候，我得到这个：

Exception in Tkinter callback 
Traceback (most recent call last): 
    File "C:\Users\GURNHH\AppData\Local\Programs\Python\Python35-32\lib\tkinter\__init__.py", line 1550, in __call__ 
    return self.func(*args) 
    File "C:\Users\GURNHH\AppData\Local\Programs\Python\Python35-32\lib\turtle.py", line 686, in eventfun 
    fun() 
    File "C:/Users/GURNHH/OneDrive - Rugby School/ICT/Python/bored.py", line 22, in k1 
    badpos.remove((int(turtle.xcor()), int(turtle.ycor()))) 
KeyError: (0, 0) 

我不知道它在这种情况下是指键错误，因为与许多其他人不同，我没有使用字典。 我的程序应该让乌龟在50次移动后回到中心，但不会在设置的badpos中计数0,0。我的程序是：

from turtle import Turtle, Screen 
    from math import * 
    from random import * 

    random = 0 

    """def add(): 
     random = random + 1 
    def check(): 
     if random > 4: 
      random = 0""" 

    def k1(): 
     global random 
     turtle.forward(10) 
     random = random + 1 

     if random > 5: 
      turtle.goto(0,0) 
      badpos.remove((int(turtle.xcor()), int(turtle.ycor()))) 


     position = (int(turtle.xcor()), int(turtle.ycor())) 

     if position in badpos: 
      turtle.color("red") 
      screen.bye() 


    def k2(): 
     turtle.left(90) 

    def k3(): 
     turtle.right(90) 

    turtle = Turtle(shape="turtle") 

    badpos = set() 

    screen = Screen() 
    screen.setup(1200, 700) 
    screen.title("Turtle-Snaky Thing") 

    screen.onkey(k1, "Up") 
    screen.onkey(k2, "Left") 
    screen.onkey(k3, "Right") 

    screen.listen() 

    screen.mainloop() 

Answer 1

令我印象深刻的是如何获取工作代码并将其完全搞乱。这是我原来的例子的返工与50移动约束补充说：

from turtle import Turtle, Screen 

def k1(): 
    global move_count 

    turtle.forward(10) 

    move_count += 1 

    if move_count % 50 == 0: 
     turtle.home() 

    position = (int(turtle.xcor()), int(turtle.ycor())) 

    if position != (0, 0) and position in badpos: 
     turtle.color("red") 
     screen.bye() 

    badpos.add(position) 

def k2(): 
    turtle.left(90) 

def k3(): 
    turtle.right(90) 

turtle = Turtle(shape="turtle") 

move_count = 0 
badpos = set() 

screen = Screen() 
screen.setup(1200, 700) 
screen.title("Turtle-Snakey Thing") 

screen.onkey(k1, "Up") 
screen.onkey(k2, "Left") 
screen.onkey(k3, "Right") 

screen.listen() 

screen.mainloop() 

我被你纳入我的例子批发，但不接受我的答案之前少留下深刻的印象。这种新的变化是棘手使用，因为只有你可以从家里重新启动很多次，在90度角，而不是踩前行，即使排除来源：

也许使转弯60或30度可能会给你更多的出门机会。

PS。你在这个程序中没有使用dict()。这是一个set()。