Button Input using Tkinter

Question

I'm creating BattleShip in Python 3.4.1 and I'm using Tkinter.

This is my source code:

from tkinter import *

vText = ["A","B","C","D","E","F","G","H","I","J"]

def press(a,b):
    print("You pressed: " + str(a * 10 + b))

root = Tk()

def button():
    for i in range(0,10):
        global self
        for j in range(1,11):
            self = Button(root, text = vText[i] + str(j), command = lambda: press(i,j), padx = 20, pady = 20).grid(row = i, column = j)
    root.wm_title("Enemy grid")
button()
root.mainloop()

Later I want to do a function based on what button is pressed. How do I do that?

falsetru · Accepted Answer · 2014-10-12 04:18:23Z

2

Make the press function to accept an additional parameter.

def press(a, b, text):
    print("You pressed: " + str(a * 10 + b), text)

And pass the button text to the function:

Button(root, text = vText[i] + str(j),
       command=lambda i=i, j=j, text=vText[i] + str(j): press(i, j, text),
       padx=20, pady=20).grid(row=i, column=j)

NOTE: use of keyword argument in lambda to bind the current value of i, j. If you don't use keyword argument, i, j, .. will reference the last values that was assigned in the loop.

BTW, grid returns nothing (= return None). Assigning the return value to a variable does not have meaning.

edited Oct 12, 2014 at 4:18

answered Oct 12, 2014 at 4:07

falsetru

371k69 gold badges769 silver badges659 bronze badges

Sign up to request clarification or add additional context in comments.

6 Comments

3.14 - Thon Over a year ago

Thanks for your quick response. However, it didn't seem to work. I don't understand the comma in the print statement. Was that a typo or something? Relatively new to python, but when I used your code it had errors galore.

3.14 - Thon Over a year ago

Also, I am aware that i and j reference the last values. Any way to stop that?

falsetru Over a year ago

@3.14-Thon, , text is there to print text passed.

3.14 - Thon Over a year ago

When I ran that, it didn't work... Specifically, it reported that "text is not defined"

falsetru Over a year ago

@3.14-Thon, I think you didn't change the signature of the function press. Try this (full code): pastebin.com/nnHLvdLM

|

Collectives™ on Stack Overflow

Button Input using Tkinter

1 Answer 1

6 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

6 Comments

Your Answer

Sign up or log in

Post as a guest

Related