Why is Button parameter “command” executed when declared?

I’m new to Python and trying to write a program with tkinter. Why is the Hello-function below executed? As I understand it, the callback would only be executed when the button is pressed? I am very confused… >>> def Hello(): print("Hi there!") >>> hi=Button(frame,text="Hello",command=Hello()) Hi there! >>> Answers: Thank you for visiting the Q&A section … Read more

How to pass an argument to a function pointer parameter?

I only just started learning Python and found out that I can pass a function as the parameter of another function. Now if I call foo(bar()) it will not pass as a function pointer but the return value of the used function. Calling foo(bar) will pass the function, but this way I am not able to pass any additional arguments. What if I want to pass a function pointer that calls bar(42)?