Question

如果在Python的Turtle Graphics中输入了一个无法识别的颜色，系统会回复您，例如：

Traceback (most recent call last):
  File "C:\Python33\turtle\ex21-starafterstar.py", line 18, in <module>
    color(outline,fillcol)      # Set pen and fill colors
  File "<string>", line 1, in color
  File "C:\Python33\lib\turtle.py", line 2208, in color
    pcolor = self._colorstr(pcolor)
  File "C:\Python33\lib\turtle.py", line 2688, in _colorstr
    return self.screen._colorstr(args)
  File "C:\Python33\lib\turtle.py", line 1150, in _colorstr
    raise TurtleGraphicsError("bad color string: %s" % str(color))
turtle.TurtleGraphicsError: bad color string: yucky brown

由此可以推断，在'try语句中捕获此类错误的方法是编写代码：

try:
    outline = input("Enter the outline color  > ")
    pencolor(outline)
    break
except TurtleGraphicsError:
    print("Sorry. I don't recognise that color.")

但这不起作用。它会生成以下错误：

Traceback (most recent call last):
  File "C:/Python33/turtle/ex28-star5coloredtry.py", line 17, in <module>
    except TurtleGraphicsError:
NameError: name 'TurtleGraphicsError' is not defined

因此，我的问题是，Turtle Graphics错误的错误类的名称是什么？

Answer 1

与错误消息一样，该范围内未定义名称TurtleGraphicsError。它在turtle包中定义。您可以像以下一样导入它：

from turtle import TurtleGraphicsError

或使用它的限定名称

import turtle
try:
    ...
except turtle.TurtleGraphicsError:
    print(...)

如何使用'try'语句捕获TurtleGraphicsError

1 个答案: