How can I pass in parameters without calling a function in Python? [duplicate]
Multi tool use
Clash Royale CLAN TAG#URR8PPPHow can I pass in parameters without calling a function in Python? [duplicate]
This question already has an answer here:
I am using the Tkinter bind function, and I would like to bind a button to a function. However, this function takes parameters (which, for obvious reasons, I have put in parentheses).
encrypt_button = Button(window, text='Encrypt')
encrypt_button.bind('<Button-1>', bl_encrypt(foo))
My problem is that, since I am passing 'foo' into my function, the function is called whenever the program gets to this line, not when I click on the button. This would not usually happen as, if there were no parameters to be passed, I would not put parentheses after the function name.
How do I bind to this function and pass parameters, but without the function being called as soon as I run the program?
My Python version is 3.6.0, if that helps.
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
encrypt_button.bind('<Button-1>', lambda: bl_encrypt(foo))
Use
functools.partial or a lambda to create a callable with no arguments that calls bl_encrypt with foo.– jonrsharpe
10 mins ago
functools.partial
lambda
bl_encrypt
foo
@AndrejKesely and jonrsharpe I have been looking into how I could use anonymous functions to solve my problem for ages but I did not think to do that! Thank you very much :) :) :)
– Ethan Wrightson
8 mins ago
@AndrejKesely Almost correct. A
.bind callback receives the Event as a parameter, so you'd need something like lambda event: bl_encrypt(foo) or perhaps lambda event, original_foo=foo: bl_encrypt(original_foo), depending on how you want foo to be handled.– PM 2Ring
6 mins ago
.bind
lambda event: bl_encrypt(foo)
lambda event, original_foo=foo: bl_encrypt(original_foo)
foo
There's lots of good info in the linked questions. It's probably worthwhile spending some time checking out the info there. Admittedly, some of that info may be a bit confusing, or too advanced at this stage, but it's ok to just skip over that stuff. ;)
– PM 2Ring
3 mins ago
I'm not that fluent with TkInter, but passing lambda like:
encrypt_button.bind('<Button-1>', lambda: bl_encrypt(foo))wouldn't help?– Andrej Kesely
12 mins ago