[Tkinter] tkinter global variable

[deanhystad]

Forget what I said earlier about the file dialog needing a callback. I am mixing up different GUI toolkits. In tkinter you treat a dialog like it waits for the file to be selected.

I would write the code so you don't access the file outside the on_openfile() function.

from tkinter import *
from tkinter import filedialog
 
def on_openfile():
    pic = filedialog.askopenfilename()
    with open(pic) as f:
        print(f.read())
 
root = Tk()
 
menubar = Menu(root)
root.config(menu=menubar)
file_menu = Menu(menubar)
file_menu.add_command(label="Open", command=on_openfile)
file_menu.add_command(label="Exit", command=root.destroy)
menubar.add_cascade(label="File", menu=file_menu)
 
root.mainloop()