Can't use results outside of functions-CodePudding

I've created a tiny script using tkinter to get values from two dropdowns. One for selecting year and the other for selcting month. The script appears to be working fine as long as I print the values of the dropdowns within the respective functions.

I wish to print the result just before the mainloop where I've defined the print statement.

from tkinter import *

master = Tk()
master.geometry("200x200")
master.minsize(200, 200)
master.maxsize(200, 200)

options_one = ['2019''2020','2021']
options_two = ["Jan","Feb","Mar"]

var_one = StringVar(master)
var_one.set('Year')
OptionMenu(master, var_one, *options_one).pack()

var_two = StringVar(master)
var_two.set('Month')
OptionMenu(master, var_two, *options_two).pack()

def choose_year():
    year_name = var_one.get()
    print(year_name)

def choose_month():
    month_name = var_two.get()
    print(month_name)

Button(master,command=choose_year).pack()
Button(master,command=choose_month).pack()

print(f"It was year {year_name} and the month was {month_name}")
mainloop()

CodePudding user response：

Your variables have a local scope inside the functions they were created in.

You can use a class initialized outside the function calls to hold the selected values, or global variables which are generally frowned upon.

CodePudding user response：

You can achieve your goal by making use of the global keyword. Use this: from tkinter import *

master = Tk()
master.geometry("200x200")
master.minsize(200, 200)
master.maxsize(200, 200)

options_one = ['2019''2020','2021']
options_two = ["Jan","Feb","Mar"]

var_one = StringVar(master)
var_one.set('Year')
OptionMenu(master, var_one, *options_one).pack()

var_two = StringVar(master)
var_two.set('Month')
OptionMenu(master, var_two, *options_two).pack()

def choose_year():
    global year_name = var_one.get()
    print(year_name)

def choose_month():
    global month_name = var_two.get()
    print(month_name)

Button(master,command=choose_year).pack()
Button(master,command=choose_month).pack()

print(f"It was year {year_name} and the month was {month_name}")
mainloop()