How to get selected value from the Tkinter OptionMenu

Question

I am trying to get the selected option from the given below OptionMenu, but I am not able to use the selected value globally.

def callback(selection):
    print(selection)
    return selection 
yearl=Label(Frame1, text='Select Year ',font=("Helvetica", 10) ).place(relx=-0.3, rely=-1.40)
valueyear= ['2018', '2019', '2020','2021', '2022', '2023']
n =StringVar(Frame1) 
n.set(valueyear[0])
yearchoosen = OptionMenu(Frame1, n, *valueyear, command=callback).place(relx=0.3, rely=-1.45, 
width=160)

In callback function I am getting the correct selected value but, I want to use selection value in other function as well.

Answer 1

You can use the value outside the function or anywhere in the code and its all fine, because your defining it on the main block:

def callback(selection):
    print(n.get())
 
yearl = Label(Frame1, text='Select Year ',font=("Helvetica", 10) )
yearl.place(relx=-0.3, rely=-1.40)

valueyear = ['2018', '2019', '2020','2021', '2022', '2023']
n = StringVar(Frame1) 
n.set(valueyear[0])

yearchoosen = OptionMenu(Frame1, n, *valueyear, command=callback,variable=n)
yearchoosen.place(relx=0.3, rely=-1.45, width=160) #so yearchoosen wont return None

n and n.get() is accessible anywhere from your code.

To test this, just make a dummy function:

def dummy():
    print('This is the value from the option menu',n.get())

dummy_b = Button(Frame1, text='Dummy',command=dummy)
dummy_b.pack()

When clicked, this button will also return the value chosen from the OptionMenu.