[Tkinter] Entry returns NONE

[mollerpunker]

Hi all,

I'm a beginner in programming with PY and started to build an GUI. Got stuck with retrieving the value of the Entry. While running the GUI the choosen location in the combobox return the values of the Entry fields. The next step is read the values to use it to calculate the directions in another PY file. For debugging i want to print the values of the Entries to determine if i get the right values. What do I wrong?

from tkinter import *
from tkinter import messagebox
from tkinter.ttk import *

window = Tk()
window.title('Declaratie dienstreis')
window.configure(background='white')
window.geometry('500x500')

locaties_dict = {
    'Vlissingen': {
        'vestiging': 'Vlissingen',
        'straat': 'Boulevard Bankert',
        'nr': '156'
    },
    'Middelburg': {
        'vestiging': 'Middelburg',
        'straat': 'Buitenruststraat',
        'nr': '16'
    },
    'Goes': {
        'vestiging': 'Goes',
        'straat': 'Zonnebloemstraat',
        'nr': '16'
    },
    'Zierikzee': {
        'vestiging': 'Zierikzee',
        'straat': 'Koning Gustaafweg',
        'nr': '2'
    },
    'Overig': {
        'vestiging': '',
        'straat': '',
        'nr': ''
    },
}

straat1 = StringVar()
nummer1 = StringVar()
plaats1 = StringVar()

straat2 = StringVar()
nummer2 = StringVar()
plaats2 = StringVar()

def handle_select_start(event):
    straat1.set(locaties_dict[combo_start.get()]['straat'])
    nummer1.set(locaties_dict[combo_start.get()]['nr'])
    plaats1.set(locaties_dict[combo_start.get()]['vestiging'])

def handle_select_eind(event):
    straat2.set(locaties_dict[combo_eind.get()]['straat'])
    nummer2.set(locaties_dict[combo_eind.get()]['nr'])
    plaats2.set(locaties_dict[combo_eind.get()]['vestiging'])

beginlocatie = Label(window, text='Beginlocatie', background='white', font=('Arial Bold', 14))\
    .grid(row=0, column=0, sticky=W)

lbl_vestiging_start = Label(window, text='Vestiging', background='white', font=('Arial', 10))\
    .grid(row=1, column=0, sticky=W)
combo_start = Combobox(window)
combo_start['values'] = list(locaties_dict.keys())
combo_start.bind('<<ComboboxSelected>>', handle_select_start)
combo_start.grid(row=1, column=2)

lbl_straat_start = Label(window, text='Straat', background='white', font=('Arial', 10)).grid(row=2, column=0, sticky=W)
lbl_nummer_start = Label(window, text='Huisnummer', background='white', font=('Arial', 10)).grid(row=3, column=0, sticky=W)
lbl_plaats_start = Label(window, text='Plaats', background='white', font=('Arial', 10)).grid(row=4, column=0, sticky=W)
straat_start = Entry(window, width=20, textvariable=straat1).grid(row=2, column=2, sticky=W)
nummer_start = Entry(window, width=20, textvariable=nummer1).grid(row=3, column=2, sticky=W)
plaats_start = Entry(window, width=20, textvariable=plaats1).grid(row=4, column=2, sticky=W)

eindlocatie = Label(window, text='Eindlocatie', background='white', font=('Arial Bold', 14))\
    .grid(row=7, column=0, sticky=W)

lbl_vestiging_eind = Label(window, text='Vestiging', background='white', font=('Arial', 10))\
  .grid(row=8, column=0, sticky=W)
combo_eind = Combobox(window)
combo_eind['values'] = list(locaties_dict.keys())
combo_eind.bind('<<ComboboxSelected>>', handle_select_eind)
combo_eind.grid(row=8, column=2)

lbl_straat_eind = Label(window, text='Straat', background='white', font=('Arial', 10)).grid(row=9, column=0, sticky=W)
lbl_nummer_eind = Label(window, text='Huisnummer', background='white', font=('Arial', 10)).grid(row=10, column=0, sticky=W)
lbl_plaats_eind = Label(window, text='Plaats', background='white', font=('Arial', 10)).grid(row=11, column=0, sticky=W)

straat_eind = Entry(window, width=20, textvariable=straat2).grid(row=9, column=2, sticky=W)
nummer_eind = Entry(window, width=20, textvariable=nummer2).grid(row=10, column=2, sticky=W)
plaats_eind = Entry(window, width=20, textvariable=plaats2).grid(row=11, column=2, sticky=W)


def send_addresses():
    messagebox.showinfo( "", "Adressen zijn verstuurt, wacht op aantal km")
    print(straat_eind)

B = Button(text ="Haal aantal km op", command = send_addresses).grid(row=11, column=4, sticky=W)


window.mainloop()

The error i get is

Error:
NONE