Tkinter Button Not Changing Global Variable

I have started learning python gui.Button function call doesn't update the global variable. Currently I am facing problem in below code. from tkinter import * root=Tk() root.titl

Solution 1:

Try this:

from tkinter import *
root=Tk()  
root.title("learning")    
x=""

def change() :   
    global x
    x="program"
    print(x)

def prt():
    global x
    print(x)

Button(root,text="Click me", command=change).pack()
Button(root,text="Print x", command=prt).pack()

root.mainloop()     
print(x)

Try to do this:

• Click 'Print x' first - This should print an empty space
• Then click on Click Me - x changes to program
• And then again click on 'Print x' - this should print program

Another error - button1 is None as you have used .pack on the same line. So if you want to use button1 in your code ahead, use it as:

button1 = Button(root, text='Click me', command=change)
button1.pack()

Solution 2:

Try this:

from tkinter import *
    
    def change():
        global str
        str="program"
        print(str) # print function should be placed here
    
    root=Tk()
    root.title("learning")
    root.geometry("300x300")
    str=""
    button1=Button(root,text="Click me", command=change).pack()
    root.mainloop()

when the button is clicked, immediately the function change() will be called so, the print function should be placed in change()