只是调用参数错误.

如果您想更改代码，此解决方案可以为您提供帮助.

If you want to change your code, this solution can help you.

类 GUI 只是继承自 Canvas，并没有实现任何东西.

Class GUI just inherits from Canvas and doesn't implement anything.

from Tkinter import*

root = Tk()

class GUI(Canvas):
    '''inherits Canvas class (all Canvas methodes, attributes will be accessible)
       You can add your customized methods here.
    '''
    def __init__(self,master,*args,**kwargs):
        Canvas.__init__(self, master=master, *args, **kwargs)

polygon = GUI(root)
polygon.create_polygon([150,75,225,0,300,75,225,150],     outline='gray', 
            fill='gray', width=2)

polygon.pack()
root.mainloop()

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