turtle.TurtleGraphicsError沒有註冊？

Question

我有這樣的代碼運行：

import random 
import turtle 

turtle.speed(0) 
def jump(x,y): 
    turtle.penup() 
    turtle.goto(x,y) 
    turtle.pendown() 
#end def 

def random_walk(n_steps): 
    turtle.goto(0,0) 
    for i in range(n_steps): 
     leftright = random.randint(0,10) 
     if leftright<5: 
      turtle.left(random.randint(0,359)) 
      turtle.forward(random.randint(8,12))  
     elif 5<leftright: 
      turtle.right(random.randint(0,359)) 
      turtle.forward(random.randint(8,12)) 
    #end for 
#end def 
step = int(input("How far would you like your turtle to move?")) 

while True: 
    try: 
     color = input("And what color would you like your turtle to be?") 
     break 
    except turtle.TurtleGraphicsError: 
     print('Oops! i dont recognize taht color, try another!') 


turtle.pencolor(color) 
random_walk(step) 

我的計劃是讓代碼當一個無效顏色字符串被實施出現停止錯誤但是外殼還是返回此錯誤：

And what color would you like your turtle to be?redf 
Traceback (most recent call last): 
    File "/Users/sgomena/Desktop/122/project 5/project5d.py", line 35, in <module> 
    turtle.pencolor(color) 
    File "<string>", line 1, in pencolor 
    File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/turtle.py", line 2252, in pencolor 
    color = self._colorstr(args) 
    File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/turtle.py", line 2696, in _colorstr 
    return self.screen._colorstr(args) 
    File "/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/turtle.py", line 1158, in _colorstr 
    raise TurtleGraphicsError("bad color string: %s" % str(color)) 
turtle.TurtleGraphicsError: bad color string: redf 
>>> 

我已經研究過它，好像我應該得到一個不同的錯誤，如果代碼運行正常。 在此先感謝您的幫助！

Answer 1

這很簡單！您需要在您的try/except區塊中插入設置您的烏龜的筆顏色（turtle.pencolor(color)）的行。

否則，當你傳遞一個無效color到turtle.pencolor()方法異常turtle.TurtleGraphicsError發生，但沒有try/except塊，處理此。

step = int(turtle.numinput("Choose a distanc", "How far would you like your turtle to move?", minval=0, maxval=10)) 
while True: 
    try: 
     print(turtle.pencolor()) 
     color = turtle.textinput("Choose a color", "What color would you like your turtle to be?") 
     turtle.pencolor(color) # Must be inside the try/except block  
     break 
    except turtle.TurtleGraphicsError: 
     print('Oops! i dont recognize taht color, try another!') 

我還建議使用龜輸入方法（textinput()numinput()和），以彈出一個對話框窗口的字符串的輸入或一個浮點數（見上面的代碼）。欲瞭解更多信息，請訪問documentation site。