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How do I pass a variable between two functions in tkinter python?-Exceptionshub

Posted by: admin February 24, 2020 Leave a comment


Here is my code:

import os
import tkinter as tk

from tkinter import filedialog

root = tk.Tk()

def click():
    folder = filedialog.askdirectory()
    button["text"] = folder

def click2():
    folder2 = filedialog.askdirectory()
    button1["text"] = folder2

def click3():
    list = os.listdir(folder)

entry = tk.Entry(root)
entry.grid(row=0, column=3)

label = tk.Label(root, text="Search from:")
label.grid(row=0, column=0)
label3 = tk.Label(root, text="Search:")
label3.grid(row=0, column=2)

label2 = tk.Label(root, text="Sort to:")
label2.grid(row=1, column = 0)

button = tk.Button(root, text="( ͡° ͜ʖ ͡°)", command=click, font=("TkDefaultFont", 12))
button.grid(row=0, column=1)

button1 = tk.Button(root, text="( ͡° ͜ʖ ͡°)", command=click2, font=("TkDefaultFont", 12))
button1.grid(row=1, column=1)

confirm = tk.Button(root, text="Confirm", command=click3, font=("TkDefaultFont", 12))
confirm.grid(row=2, column=1)


And I get an error:
NameError: name 'folder' is not defined

As I understand, I need to somehow pass the “folder” variable between the two functions. I’ve already tried lots of things like using classes, that honestly, I’m not really familiar with.

Please help!

How to&Answers:

This is a classic problem when using functions. Within a function all the variables are local so they only exist in that function what you need to do is globalise the variable so that it exist throughout the program. This is done by saying global and then the variable name before defining said variable.
Your new code should look like this.

global folder
folder = filedialog.askdirectory()