Why Does My Button's Command Execute Immediately Instead of on Click?

Why Does My Button's Command Execute Immediately upon Creation?

Question:

In the provided code, a button is created and its command option is set to a function call with an argument. However, the button prints the argument and another string immediately upon creation, and does not respond to clicks. Why does this occur?

Answer:

The provided code passes the result of the function call button('hey') directly to the command option. This causes the function to be executed immediately, rather than when the button is clicked.

To fix this, the correct way to pass a function as the command is to use its name without parentheses or arguments. For example:

b = Button(admin, text='as', command=button)

However, to pass an argument to a function, you can use a lambda function, which is an anonymous function that returns a reference to itself:

b = Button(admin, text='as', command=lambda: button('hey'))

The above is the detailed content of Why Does My Button's Command Execute Immediately Instead of on Click?. For more information, please follow other related articles on the PHP Chinese website!