Python Tkinter绑定具有多个参数的函数

问题描述

我有一个一般性的问题，我找不到真正的答案，因此希望你们能提供帮助.我有一个带有3个参数的函数，下面是我所拥有的示例.

I have a general question that I can't really find an answer to so hopefully you guys can help. I have a function that takes 3 parameters, below is an example of what I have.

def someFunction(self, event, string):

   do stuff ..

self.canvas.bind("<Button-1>", self.someFunction("Hello"))

运行此命令时，我收到一条错误消息，说我传递了someFunction 2参数而不是3.我不确定为什么..

When I run this, I get an error saying that I passed someFunction 2 arguments instead of 3. I'm not sure why ..

推荐答案

在这里，您要绑定someFunction的结果(或尝试这样做).之所以失败是因为，当python尝试获取someFunction的结果时，当someFunction确实需要2个显式参数时，它仅传递1个参数("Hello")进行调用.您可能想要类似的东西:

Here you're binding the result of someFunction (or trying to anyway). This fails because when python tries to get the result of someFunction, it calls it only passing 1 argument ("Hello") when someFunction really expects 2 explicit arguments. You probably want something like:

self.canvas.bind('<Button-1>',lambda event: self.someFunction(event,"Hello"))

这将绑定一个新函数(由lambda创建并环绕self.someFunction)，该函数将传递正确的参数.

This binds a new function (which is created by lambda and wraps around self.someFunction) which passes the correct arguments.

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