class Personen:
    name = ''
    surname = ''
    city = ''
    def __init__(self, nn, sn, ct):
        self.name = nn
        self.surname = sn
        self.city = ct

    def __del__(self):
        pass
from tkinter import *
import csv

my_list = []

def add_person(person):
    my_list.append(person)

def set_data(nn, sn, ct):
    person = Personen(nn, sn, ct)
    add_person(person)

interface =Tk()

Label(interface, text="First Name").grid(row=0)
Label(interface, text="Last Name").grid(row=1)
Label(interface, text="City").grid(row=2)

entry_1 = Entry(interface)
entry_2 = Entry(interface)
entry_3 = Entry(interface)

def take_input():
    nn = entry_1.get()
    sn = entry_2.get()
    ct = entry_3.get()
    set_data(nn, sn, ct)
    for person in my_list:
        print(person.name, person.surname, person.city)
    entry_1.delete(0, 'end')
    entry_2.delete(0, 'end')
    entry_3.delete(0, 'end')
    with open('vol7.csv', 'w') as f:
        write = csv.writer(f)
        write.writerow(my_list)


entry_1.grid(row=0, column=1)
entry_2.grid(row=1, column=1)
entry_3.grid(row=2, column=1)

Button(interface, text='Quit', command=interface.quit).grid(row=3, column=0, sticky=W, pady=4)
Button(interface, text='Take', command=take_input).grid(row=3, column=1, sticky=W, pady=4)


interface.mainloop()
print(my_list)

with open('vol5.csv', 'w') as f:
    write = csv.writer(f)
    write.writerow(my_list)