关闭屏幕上的Python龟错误 - 如何像计算机科学家一样思考的代码：使用Python学习3(Python turtle error on closing screen - code from How to Think Like a Computer Scientist: Learning with Python 3)

 当我运行此代码时 
 
import turtle
import time

def show_poly():
    try:
        win = turtle.Screen()
        tess = turtle.Turtle()
        n = int(input("How many sides do you want in your polygon?"))
        angle = 360 / n
        for i in range(n):
            tess.forward(10)
            tess.left(angle)
        time.sleep(3)
    finally:
        win.bye()

show_poly()
show_poly()
show_poly()
 
 我得到的第一个呼叫正常工作比我得到这个错误 
 
 
 
 回溯（最近一次调用最后一次）：show_poly（）中的文件“/home/turte.py”，第19行 
 
 
 文件“/home/turte.py”，第8行，show_poly tess = turtle.Turtle（） 
 
 
 文件“/usr/lib/python3.5/turtle.py”，第3816行，在init visible = visible中） 
 
 
 在init self._update（）中的文件“/usr/lib/python3.5/turtle.py”，第2557行 
 
 
 文件“/usr/lib/python3.5/turtle.py”，第2660行，在_update self._update_data（）中 
 
 
 文件“/usr/lib/python3.5/turtle.py”，第2646行，在_update_data self.screen._incrementudc（）中 
 
 
 _incrementudc中的文件“/usr/lib/python3.5/turtle.py”，第1292行 
 
 
 举起终结者turtle.Terminator 
 
 
 如果我理解了这个问题，即使我关闭了最后一个屏幕也无法创建新屏幕。 我运行python 3.5 

when I run this code
 
import turtle
import time

def show_poly():
    try:
        win = turtle.Screen()
        tess = turtle.Turtle()
        n = int(input("How many sides do you want in your polygon?"))
        angle = 360 / n
        for i in range(n):
            tess.forward(10)
            tess.left(angle)
        time.sleep(3)
    finally:
        win.bye()

show_poly()
show_poly()
show_poly()
 
I get the first call work properly than I get this error
 
 
 
Traceback (most recent call last): File "/home/turte.py", line 19, in show_poly()
 
 
File "/home/turte.py", line 8, in show_poly tess = turtle.Turtle()
 
 
File "/usr/lib/python3.5/turtle.py", line 3816, in init visible=visible)
 
 
File "/usr/lib/python3.5/turtle.py", line 2557, in init self._update()
 
 
File "/usr/lib/python3.5/turtle.py", line 2660, in _update self._update_data()
 
 
File "/usr/lib/python3.5/turtle.py", line 2646, in _update_data self.screen._incrementudc()
 
 
File "/usr/lib/python3.5/turtle.py", line 1292, in _incrementudc
 
 
raise Terminator turtle.Terminator
 
 
If I understand the problem I cannot create a new screen even if I closed the last. I run python 3.5

原文：https://stackoverflow.com/questions/46630254