Capture Text from tkinter entry widget

Question

I'm trying to run the below script to capture text entered by a user into a form using tkinter.

from tkinter import *

class Window(Frame):
    def __init__(self, master = None):
        Frame.__init__(self, master)
        self.master = master
        self.init_window()

    # create init window
    def init_window(self):
        self.master.title("Example Title")
        self.pack(fill = BOTH, expand = 1)

        #submit button
        submitButton = Button(self, text = "submit", command = self.showEntry).grid(row = 6, column = 1, sticky = W, pady = 5)

        # entry widgets
        Label(self, text = "Firstname").grid(row = 0)    
        Label(self, text = "Surname").grid(row = 1)
        Label(self, text = "Age").grid(row = 2)    
        Label(self, text = "Gender").grid(row = 3)

        e1 = Entry(self)
        e2 = Entry(self)
        e3 = Entry(self)
        e4 = Entry(self)

        e1.grid(row=0, column=1)
        e2.grid(row=1, column=1)
        e3.grid(row=2, column=1)
        e4.grid(row=3, column=1)

    # show entries
    def showEntry(self):
        txt = e1.get()
        print("Firstname is %s" % txt)
        root.destroy()  


root = Tk()
root.geometry("400x300")
app = Window(root)

app.mainloop()

When doing so the below NameError occurs:

NameError: name 'e1' is not defined

I am very new to tkinter, so any help in how to get the text entered by the user, and why this error is occurring would be greatly appreciated.

Thanks

Answer 1

It is not tkinter but OOP problem.

You have to use self. to create variable which exists in all methods in class

self.e1 = Entry()

and later

self.e1.get()

Currently e1 is local variable which exists only in init_window