import tkinter as tk
import tkinter.messagebox as tm
class Application(tk.Frame):
    def __init__(self, master=None):
        super().__init__(master)
        self.master = master
        self.pack()
        self.create_widgets()

    def create_widgets(self):
        self.nameLbl = tk.Label(self, text = "Логин: ")
        self.passLbl = tk.Label(self, text = "Пароль: ")
        self.confirmLbl = tk.Label(self, text = "Повторите пароль: ")

        self.nameEntry = tk.Entry(self)
        self.passEntry = tk.Entry(self)
        self.confirmEntry = tk.Entry(self)

        self.nameLbl.grid(row = 0, sticky = tk.E)
        self.passLbl.grid(row = 1, sticky = tk.E)
        self.confirmLbl.grid(row = 2, sticky = tk.E)

        self.nameEntry.grid(row = 0, column = 1)
        self.passEntry.grid(row = 1, column = 1)
        self.confirmEntry.grid(row = 2, column = 1)

        self.createBtn = tk.Button(self, text = "Создать", command = self.createUser)
        self.createBtn.grid(columnspan = 2)

        self.pack(padx = 10, pady = 10)

    def createUser(self):
        passtext = self.passEntry.get()
        confirmtext = self.confirmEntry.get()

        if passtext != confirmtext:
            tm.showerror("Ошибка", "Пароли не совпадают!");

root = tk.Tk()
root.resizable(False, False)
app = Application(master=root)
app.mainloop()