Python .insert（）函数不适用于我的输入框

我正在编写一个函数，它将输入框小部件作为参数，配置输入框（更改文本的颜色），然后将一些文本插入输入框。除了输入框中没有显示文本外，Evrythig工作正常

功能如下：

def entry_error(self, entry):
        entry.delete(0, tk.END)
        entry.config(fg = "red")
        entry.insert(0, "Data Invalid!")

对该函数的调用是：

if len(firstName) == 0: # If no data is entered for the first name
            dataValid = False # The data is invalid
            self.entry_error(self.firstNameEntry) ### <-- CALL TO FUNCTION ###

如果len（firstName）==0:#如果没有为名字输入数据
dataValid=False#数据无效
self.entry#u错误（self.firstNameEntry）###请尝试将您的代码缩减为一个错误。我们真的只需要一个条目，您遇到问题的函数，以及足够的代码来运行它。我已经尝试过简化它，但是这样做之后，问题就解决了。我无法确定这种情况是如何发生的，因为我只在出现上述代码时才发现问题。插入文本后，我尝试使用.get（）函数打印条目的内容，并打印数据，因此插入工作正常，但文本未显示在条目中，请重试。我不敢相信，复制这一点的唯一方法需要十几个条目小部件、标签和intvars，再加上几十行验证代码。
'''
Variable Name = variableName
Function Name = function_name
'''

import string # Importing the string module
import random # Importing the random module
import sqlite3 # Importing sqlite3
import tkinter as tk # Importing the tkinter module to create a GUI
from tkinter import messagebox # Importing the messagebox class from the tkinter module
from tkinter import filedialog # Importing the filedialog class from the tkinter module
from shutil import copyfile # Importing the copyfile class from the shutil module



# Class To Create The Main Window #
class window(tk.Tk): # Defining the class (window) which inherits the properties of the tkinter class Tk
    def __init__(self): # Defining the initial function that runs every time an instance of this class is made
        tk.Tk.__init__(self) # Running the __init__() function of the Tk class to create the new window

        self.screenWidth = self.winfo_screenwidth() # Sets the variable screenWidth to the width of the users screen
        self.screenHeight = self.winfo_screenheight() # Sets the variable screenHeight to the height of the users screen

        self.geometry("%sx%s" % (self.screenWidth, self.screenHeight)) # Sets the width and height of the main window to the width and height of the users screen
        self.overrideredirect(1) # Removes the border from the window

        self.existingFrames = {} # Creating a dictionay to store the frames that currently exist

        ''' All New Frame classes need to be added to the list below '''
        self.frameNames = [loginPage, registerPage, termsOfServicePage] # Creating a lsit of names of all the frames linked to this class

        for frameName in self.frameNames: # Iterating through the list of names of frames
            self.existingFrames[frameName] = frameName(self) # Creating a new element in the dictionary where the frame name is the key and the frame pointer is the value
            self.existingFrames[frameName].grid(row = 0, column = 0) # Adding the frame to the windows grid

        self.existingFrames[loginPage].lift() # Bringing the login screen to the top so that it is visible by the user

    def show_frame(self, frameToShow): # Creating a function in the class that takes the name of the frame to display
        frame = self.existingFrames[frameToShow] # Gets the value from the dictionary of the frame that is passed through as frameToShow
        frame.lift() # Raises the frame to the top so that it is visible by the user

    def close_window(self): # Function to close the window when called
        closeWindow = messagebox.askyesno("Close Window?", "Are you sure you want to close the window?\nAll unsaved data will be lost!") # Asks the user if they definitely want to close the window and stores the result under the variable closeWindow
        if closeWindow == True: # If the user answeres yes
            self.destroy() # The window gets destroyed
            exit() # The program is exited


# Class To Create The Login Page #
class loginPage(tk.Frame): # Defining the class (loginPage) which inherits the properties of the tkinter Frame class
    def __init__(self, parentClass): # Defining the initial function that runs every time an instance of this class is made
        self.parentClass = parentClass # Creating a variable to store the pointer to the parent class that can be used by all function in this class

        tk.Frame.__init__(self, self.parentClass, width = self.parentClass.screenWidth, height = self.parentClass.screenHeight) # Creates a Frame inside the main window passed through as rootWidnow

        self.exitButton = tk.Button(self, text = "X", fg = "red", font = ("", 10), command = self.parentClass.close_window) # Creates an exit button in the Frame with the main window's close_windwo() command
        self.exitButton.place(anchor = tk.NE, x = self.parentClass.screenWidth, y = 0) # Places the exit button in the top right corner of the frame


        self.usernamelabel = tk.Label(self, text = "Username:", font = ("Cooper Black", 15)) # Creating a label to instruct the user to enter their username
        self.usernamelabel.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 5) * 2, y = (self.parentClass.screenHeight / 12) * 5) # Placing the label in the frame

        self.passwordlabel = tk.Label(self, text = "Password:", font = ("Cooper Black", 15)) # Creating a label to instruct the user to enter their password
        self.passwordlabel.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 5) * 2, y = (self.parentClass.screenHeight / 12) * 6) # Placing the label in the frame

        self.usernameEntry = tk.Entry(self, font = ("", 12)) # Creating an entry for the user to enter their username
        self.usernameEntry.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 5) * 3, y = (self.parentClass.screenHeight / 12) * 5) # Placing the entry next to usernamelabel in the frame

        self.passwordEntry = tk.Entry(self, font = ("", 12), show = "*") # Creating an entry for the user to enter their password (A * will be shown instead of plain text for security)
        self.passwordEntry.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 5) * 3, y = (self.parentClass.screenHeight / 12) * 6) # Placing the entry next to passowrdlabel in the frame

        self.loginButton = tk.Button(self, text = "Login", font = ("Cooper Black", 17), command = self.submit_data) # Creating a button for the user to submit their login details
        self.loginButton.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 2), y = (self.parentClass.screenHeight / 12) * 7) # Placing the button in the frame

        self.newAccountButton = tk.Button(self, text = "Dont Have An Account!", font = ("Cooper Black", 13), command = self.no_account) # Creating a button for the user to go to the screen to register a new account
        self.newAccountButton.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 2), y = (self.parentClass.screenHeight / 12) * 8) # Placing the button in the frame

    def submit_data(self): # Creating a function to submit the users login details (parameters: the entries used for the username and password)
        username = self.usernameEntry.get() # geting the username from the username entry
        password = self.passwordEntry.get() # getting the password from the passoword entry

        self.usernameEntry.delete(0, tk.END) # Deleting the text in the entry
        self.passwordEntry.delete(0, tk.END) # Deleting the text in the entry

        # VALIDATE DATA #

    def no_account(self): # Creating a function to take the user to the register screen if they do not have an account
        self.usernameEntry.delete(0, tk.END) # Deleting the text in the entry
        self.passwordEntry.delete(0, tk.END) # Deleting the text in the entry

        self.parentClass.show_frame(registerPage) # Switches the screen visible by the user to the register screen



# Class To Create The Register Page #
class registerPage(tk.Frame): # Defining the class (registerPage) which inherits the properties of the tkinter Frame class
    def __init__(self, parentClass): # Defining the initial function that runs every time an instance of this class is made
        self.parentClass = parentClass # Creating a variable to store the pointer to the parent class that can be used by all function in this class

        tk.Frame.__init__(self, self.parentClass, width = self.parentClass.screenWidth, height = self.parentClass.screenHeight) # Creates a Frame inside the main window passed through as rootWidnow

        self.exitButton = tk.Button(self, text = "X", fg = "red", font = ("", 10), command = self.parentClass.close_window) # Creates an exit button in the Frame with the main window's close_windwo() command
        self.exitButton.place(anchor = tk.NE, x = self.parentClass.screenWidth, y = 0) # Places the exit button in the top right corner of the frame


        self.firstNameLabel = tk.Label(self, text = "First Name:", font = ("Cooper Black", 15)) # Creating a label to instruct the user to enter their first name
        self.firstNameLabel.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 3, y = (self.parentClass.screenHeight / 9) * 1) # Placing the label in the frame

        self.firstNameEntry = tk.Entry(self, font = ("", 12)) # Creating an entry for the user to enter their first name
        self.firstNameEntry.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 7, y = (self.parentClass.screenHeight / 9) * 1) # Placing the entry in the frame

        self.surnameLabel = tk.Label(self, text = "Surname:", font = ("Cooper Black", 15)) # Creating a label to instruct the user to enter their surname
        self.surnameLabel.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 3, y = (self.parentClass.screenHeight / 9) * 2) # Placing the label in the frame

        self.surnameEntry = tk.Entry(self, font = ("", 12)) # Creating an entry for the user to enter their surname
        self.surnameEntry.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 7, y = (self.parentClass.screenHeight / 9) * 2) # Placing the entry in the frame

        self.emailLabel = tk.Label(self, text = "Email:", font = ("Cooper Black", 15)) # Creating a label to instruct the user to enter their email
        self.emailLabel.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 3, y = (self.parentClass.screenHeight / 9) * 3) # Placing the label in the frame#

        self.emailEntry = tk.Entry(self, font = ("", 12)) # Creating an entry for the user to enter their email
        self.emailEntry.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 7, y = (self.parentClass.screenHeight / 9) * 3) # Placing the entry in the frame

        self.confirmEmailLabel = tk.Label(self, text = "Confirm Email:", font = ("Cooper Black", 15)) # Creating a label to instruct the user to enter their email
        self.confirmEmailLabel.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 3, y = (self.parentClass.screenHeight / 9) * 4) # Placing the label in the frame

        self.confirmEmailEntry = tk.Entry(self, font = ("", 12)) # Creating an entry for the user to enter their confirm email
        self.confirmEmailEntry.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 7, y = (self.parentClass.screenHeight / 9) * 4) # Placing the entry in the frame

        self.usernameLabel = tk.Label(self, text = "Username:", font = ("Cooper Black", 15)) # Creating a label to instruct the user to enter their first name
        self.usernameLabel.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 13, y = (self.parentClass.screenHeight / 9) * 1) # Placing the label in the frame

        self.usernameEntry = tk.Entry(self, font = ("", 12)) # Creating an entry for the user to enter their first name
        self.usernameEntry.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 17, y = (self.parentClass.screenHeight / 9) * 1) # Placing the entry in the frame

        self.passwordLabel = tk.Label(self, text = "Password:", font = ("Cooper Black", 15)) # Creating a label to instruct the user to enter their surname
        self.passwordLabel.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 13, y = (self.parentClass.screenHeight / 9) * 2) # Placing the label in the frame

        self.passwordEntry = tk.Entry(self, font = ("", 12), show = "*") # Creating an entry for the user to enter their surname
        self.passwordEntry.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 17, y = (self.parentClass.screenHeight / 9) * 2) # Placing the entry in the frame

        self.confirmPasswordLabel = tk.Label(self, text = "Confirm Password:", font = ("Cooper Black", 15)) # Creating a label to instruct the user to enter their email
        self.confirmPasswordLabel.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 13, y = (self.parentClass.screenHeight / 9) * 3) # Placing the label in the frame#

        self.confirmPasswordEntry = tk.Entry(self, font = ("", 12), show = "*") # Creating an entry for the user to enter their email
        self.confirmPasswordEntry.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 17, y = (self.parentClass.screenHeight / 9) * 3) # Placing the entry in the frame

        self.termsOfServiceVar = tk.IntVar() # Creating an Integer variable to store the status of the terms of service check button
        self.termsOfServiceCheckButton = tk.Checkbutton(self, text = "I agree to the terms of service", variable = self.termsOfServiceVar) # Creating a check button for the user to accept the terms of service
        self.termsOfServiceCheckButton.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 13, y = (self.parentClass.screenHeight / 9) * 4) # Places the check button in the frame
        self.termsOfServiceCheckButton.bind("<Button 1>", self.show_terms_of_service) # Runs the show_terms_of_service function when the check button is clicked

        self.recieveEmailsVar = tk.IntVar() # Creating an Integer variable to store the status of the email preference check button
        self.recieveEmailsCheckButton = tk.Checkbutton(self, text = "I agree to recieve promotional emails", variable = self.recieveEmailsVar) # Creates a check button for the user to agree to recieve promotinal emails
        self.recieveEmailsCheckButton.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 17.5, y = (self.parentClass.screenHeight / 9) * 4) # Places the check button in the frame

        self.registerButton = tk.Button(self, text = "Register", font = ("Cooper Black", 17), command = self.submit_data) # Creating a button for the user to submit their data
        self.registerButton.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 10, y = (self.parentClass.screenHeight / 9) * 5.25)

        self.hasAccountButton = tk.Button(self, text = "Already Have An Account!", font = ("Cooper Black", 13), command = self.has_account) # Creating a button for the user to go to the login screen
        self.hasAccountButton.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 10, y = (self.parentClass.screenHeight / 9) * 6) # Placing the button in the frame

        self.dividerLine = tk.Label(self, text = "_" * self.parentClass.screenWidth, font = ("Cooper Black", 15)) # Creating a line to divide the screen into sections
        self.dividerLine.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 10, y = (self.parentClass.screenHeight / 9) * 7) # Placing the label in the frame

        self.loginAsGuestButton = tk.Button(self, text = "Continue As Guest", font = ("Cooper Black", 13), command = self.login_as_guest) # Creating a button for the user to go to sign in as a guest
        self.loginAsGuestButton.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 20) * 10, y = (self.parentClass.screenHeight / 9) * 8) # Placing the button in the frame

    def empty_entries(self): # Creating a function to empty the data from the etnry boxes
        entries = [self.firstNameEntry, self.surnameEntry, self.emailEntry, self.confirmEmailEntry, self.usernameEntry, self.passwordEntry, self.confirmPasswordEntry] # List of entries in the register screen
        for entry in entries: # Iterates through the list of entries
            entry.delete(0, tk.END) # Deletes the text in the entry
        self.termsOfServiceVar.set(0) # Resetting the check button
        self.recieveEmailsVar.set(0) # Resetting the check button

    def entry_error(self, entry):
        entry.delete(0, tk.END)
        entry.config(fg = "red")
        entry.insert(0, "Data Invalid!")
        entry.bind("<Button 1>")#, lambda event: self.remove_entry_error(entry))

    def remove_entry_error(self, entry):
        entry.delete(0, tk.END)
        entry.config(fg = "black")
        entry.unbind("<Button 1>")

    def has_account(self):
        self.empty_entries()
        self.parentClass.show_frame(loginPage) # Switches the screen visible by the user to the login screen

    def submit_data(self):
        firstName = self.firstNameEntry.get() # getting the data from the entry box and storing it under a variable
        surname = self.surnameEntry.get() # getting the data from the entry box and storing it under a variable
        email = self.emailEntry.get() # getting the data from the entry box and storing it under a variable
        confirmEmail = self.confirmEmailEntry.get() # getting the data from the entry box and storing it under a variable
        username = self.usernameEntry.get() # getting the data from the entry box and storing it under a variable
        password = self.passwordEntry.get() # getting the data from the entry box and storing it under a variable
        confirmPassword = self.confirmPasswordEntry.get() # getting the data from the entry box and storing it under a variable
        termsOfServiceStatus = self.termsOfServiceVar.get() # getting the data from the check button and storing it under a variable
        recieveEmailsStatus = self.recieveEmailsVar.get() # getting the data from the check button and storing it under a variable

        # Validating Data #
        dataValid = True # Variable to store whether or not the data is valid. Data stays valid untill found invalid

        if len(firstName) == 0: # If no data is entered for the first name
            dataValid = False # The data is invalid
            self.entry_error(self.firstNameEntry) # Runs the function to display an error in the data to the user

        if len(surname) == 0: # If no data is entered for the surname
            dataValid = False # The data is invalid

        if "@" not in email or "." not in email: # If the email does not contain both an '@' and a '.'
            dataValid = False # The data is invalid

        if confirmEmail != email: # If both emails do not match
            dataValid = False # The data is invalid

        if " " in username: # If the username contains a space
            dataValid = False # the data is invalid

        if len(password) < 8: # If the password is less than 8 characters
            dataValid = False # The data is invalid
        else:
            uppercase = False # Variable to store if the password contains an uppercase letter
            lowercase = False # Variable to store if the password contains an lowercase letter
            punctuation = False # Variable to store if the password contains a special character
            digit = False # Variable to store if the password contains a digit
            for char in password: # Iterates through each character in the password
                if char in string.ascii_uppercase: # If the character is an uppercase letter
                    uppercase = True # The uppercase variable is true
                elif char in string.ascii_lowercase: # If the character is a lowercase letter
                    lowercase = True # The lowercase variable is true
                elif char in string.punctuation: # If the character is a special character
                    punctuation = True # The punctuation variable is true
                elif char in string.digits: # If the character is a digit
                    digit = True # The digit variable is true
            if uppercase == False or lowercase == False or punctuation == False or digit == False: # If any of the 4 variables are False
                dataValid = False # The data is invalid

        if confirmPassword != password: # If the two passwords dont match
            dataValid = False # The data is invalid

        self.empty_entries()

    def login_as_guest(self):
        pass

    def show_terms_of_service(self, *args): # Function to show the terms of service screen
        self.termsOfServiceCheckButton.unbind("<Button 1>") # Unbinds Button 1 from the widget
        self.parentClass.show_frame(termsOfServicePage) # Calls the function to display the terms of service screen

# Class To Create The Terms Of Service Page #
class termsOfServicePage(tk.Frame):
    def __init__(self, parentClass):
        self.parentClass = parentClass

        tk.Frame.__init__(self, self.parentClass, width = self.parentClass.screenWidth, height = self.parentClass.screenHeight)

        self.exitButton = tk.Button(self, text = "X", fg = "red", font = ("", 10), command = lambda: self.exit_screen(False))
        self.exitButton.place(anchor = tk.NE, x = self.parentClass.screenWidth, y = 0)

        self.titleLabel = tk.Label(self, text = "Terms Of Service", font = ("Cooper Black", 20))
        self.titleLabel.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 2), y = (self.parentClass.screenHeight / 11) * 1)

        self.acceptButton = tk.Button(self, text = "Accept Terms Of Service", font = ("Cooper Black", 17), command = lambda: self.exit_screen(True))
        self.acceptButton.place(anchor = tk.CENTER, x = (self.parentClass.screenWidth / 2), y = (self.parentClass.screenHeight / 11) * 10)

    def exit_screen(self, status):
        if status == True:
            self.parentClass.existingFrames[registerPage].termsOfServiceVar.set(1)
        else:
            self.parentClass.existingFrames[registerPage].termsOfServiceVar.set(0)

        self.parentClass.show_frame(registerPage)

mainWindow = window() # Creating an instance of the window class
mainWindow.mainloop() # Calling the mainloop function on mainWindow to allow the user to interact with the window and to allow events to be responded to