令人困惑的类型错误 [英] Confusing TypeError

问题描述

我有一个小的 Python 程序，它应该通过运行适当的方法来响应按下向上按钮.但不是这样做，它给了我一个令人困惑的错误......

I have a small Python program that should react to pushing the up button by running an appropriate method. But instead of doing this, it gives me a confusing error...

from tkinter import *
class App:
    def __init__(self, master):
        self.left = 0
        self.right = 0
        widget = Label(master, text='Hello bind world')
        widget.config(bg='red')            
        widget.config(height=5, width=20)                  
        widget.pack(expand=YES, fill=BOTH)
        widget.bind('<Up>',self.incSpeed)   
        widget.focus()
    def incSpeed(self):
        print("Test")

root = Tk() 
app = App(root)
root.mainloop()

错误是:

Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib/python3.2/tkinter/__init__.py", line 1402, in __call__
    return self.func(*args)
TypeError: incSpeed() takes exactly 1 positional argument (2 given)

可能是什么问题?

推荐答案

incSpeed 方法应该接受一个额外的参数；你的只需要 self 但它传递了一个 事件论据也是如此.

The incSpeed method should take an extra argument; yours only takes self but it is passed an event argument as well.

更新您的函数签名以接受它:

Update your function signature to accept it:

def incSpeed(self, event):
    print("Test")

这篇关于令人困惑的类型错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！