Tkinter功能附加到Button立即执行 [英] Tkinter Function attached to Button executed immediately

问题描述

我需要的是将函数附加到使用参数调用的按钮上.但是，当我按如下方式编写代码时，创建按钮后代码将执行一次，然后不再执行.另外，如果我声明该函数为按钮的属性，那么我摆脱了参数和括号，代码就可以正常工作.仅当按下按钮时，如何才能通过参数调用函数?

What I need is to attach a function to a button that is called with a parameter. When I write the code as below however, the code is executed once when the button is created and then no more. Also, the code works fine if I get rid of the parameter and parentheses when I declare the function as an attribute of the button. How can I call the function with a parameter only when the button is pressed?

from Tkinter import *

root =Tk()

def function(parameter):
    print parameter

button = Button(root, text="Button", function=function('Test'))
button.pack()

root.mainloop()

推荐答案

解决方案是将函数作为lambda传递:

The solution is to pass the function as a lambda:

from Tkinter import *

root =Tk()

def callback(parameter):
    print parameter

button = Button(root, text="Button", command=lambda: callback(1))
button.pack()

root.mainloop()

此外，正如@nbro已经正确指出的那样，button属性是命令，而不是功能.

Also, as @nbro already correctly pointed out, the button attribute is command, not function.

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