Button not updating variable in tkinter

Question

Been working on a pesronal app and one of my TopLevel windows won´t work correctly. I need for the variable idd to be whatever the user inputs in the Entry widget, but something is wrong and I've tried everything I know of tkinter without results.

The widget I generate is the following:

def win_erase_id(parent):
    idd=-1
    wind=Toplevel(parent)
    wind.title("Enter id")
    lbl=Label(win,text="Enter player ID you want to erase:")
    svar=StringVar()
    ent=Entry(win,textvariable=svar)
    fr=Frame(win)

    def butA_m():
        idd=int(svar.get())
        wind.destroy()

    def butC_m():
        idd=-1
        wind.destroy()

    butA=Button(fr,text="Accept",command=butA_m,relief=RAISED)
    butC=Button(fr,text="Cancel",command=butC_m,relief=RAISED)
    lbl.grid(row=0,sticky="nswe")
    ent.grid(row=1,sticky="nswe")
    fr.grid(row=2,sticky="nswe")

    butA.pack(side=LEFT,fill=BOTH)
    butC.pack(side=RIGHT,fill=BOTH)
   
    wind.wait_window()
    return idd

I thought that by setting a textvariable and then in the method butA_m asking that variable for its value the end variable would be the integer I needed, but the value I get is always -1. Tried using .delete() and .insert() on the Entry widget but wouldn't work either.

Edit: I accidentally erased some "d"s from the wind instances but already corrected it.

Answer 1

nonlocal, as stated by somebody before me actually solves it, I just did not understand how to use it, but after checking this site I ended up correcting my code and it worked.

    def butA_m():
        nonlocal idd
        idd=int(svar.get())
        wind.destroy()
    
    def butC_m():
        nonlocal idd
        idd=-1
        wind.destroy()