AttributeError：'_Screen‘对象没有属性'mainloop’

Question

我正在设计一个简单的Python程序，它使用Turtle图形模块在屏幕上用箭头键画线。

import turtle

turtle.setup(400,500)                # Determine the window size
wn = turtle.Screen()                 # Get a reference to the window
wn.title("Handling keypresses!")     # Change the window title
wn.bgcolor("lightgreen")             # Set the background color
tess = turtle.Turtle()               # Create our favorite turtle

# The next four functions are our "event handlers".
def h1():
   tess.forward(30)

def h2():
   tess.left(45)

def h3():
   tess.right(45)

def h4():
    wn.bye()                        # Close down the turtle window

# These lines "wire up" keypresses to the handlers we've defined.
wn.onkey(h1, "Up")
wn.onkey(h2, "Left")
wn.onkey(h3, "Right")
wn.onkey(h4, "q")

# Now we need to tell the window to start listening for events,
# If any of the keys that we're monitoring is pressed, its
# handler will be called.
wn.listen()
wn.mainloop()

当我尝试执行它时，将返回以下错误。

Traceback (most recent call last):
  File "C:\Users\Noah Huber-Feely\Desktop\PEN_Programming\Python\etchy_sketch1.py", line 32, in <module>
    wn.mainloop()
AttributeError: '_Screen' object has no attribute 'mainloop'

我使用Python2.7，以前没有遇到过海龟图形方面的问题。直到现在，我才开始用关键的投入来解决这个问题。

在网上搜索，我只找到了与我目前正在经历的不同问题和模块有关的文章。

如果你需要更多的信息，请告诉我。谢谢!

Answer 1

它仍然是turtle.mainloop()，而不是wn.mainloop()。

我怀疑这是因为您可以制作多个屏幕，所以仍然让turtle模块管理所有屏幕是有意义的，而不是试图让多个主循环协同工作。