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Python Tkinter, can I limit the number of entry?

How can I limit the number of user inputs such that if the user has wrongly tried 5 times already, the system will end immediately?

I have tried to use While loop as usual to achieve. However, the while loop seems to be unable to calculate the number of incorrect input.

Please let me know what should I do. Appreciate

import tkinter as tk
import csv
from tkinter import messagebox


def user_login():
locals()
entry_user_name = entry_usr_name.get()
entry_user_pwd = entry_usr_pwd.get()

with open(r'user.csv', 'r') as user_file
reader = csv.reader(user_file)
user = list(reader)
found = False
count1 = 5
for count in range(len(user)):
if entry_user_name == user[count][0]:
if entry_user_pwd == user[count][1]:
target = count
found = True
break
else: found = False
else: found = False
count1 -= 1
if not found:
tk.messagebox.showerror(title='Error',
message='Invalid password. Please enter again. You have '+str(count1)+ ' left')
if count1 == 0:
tk.messagebox.showerror(title='Error',
line1='Too many input. The system will be ended immediately',
line2='This will be recorded in the security system')
if found:
tk.messagebox.showinfo(title='Successful login',
message='Valid password.')
startpage()



window = tk.Tk()
entry_username = tk.Entry(window, font='Courier 17')
entry_pwd = tk.Entry(window,font='Courier 17')
entry_usr_name.place(x=330, y=245)
entry_usr_pwd.place(x=330, y=345)

login_button= tk.Button(window,
command=user_login) # with some setting
login_button.place(x=440, y=420)
window.mainloop()


1 Answer
1

You can use a tracking variable to keep record of how many attempts a person has made.

Here is a simple example.

import tkinter as tk


root = tk.Tk()

counter = 1 # tracking variable

tk.Label(root, text="User Name: ").grid(row=0, column=0)
tk.Label(root, text="Password: ").grid(row=1, column=0)
entry_name = tk.Entry(root)
entry_pass = tk.Entry(root)
entry_name.grid(row=0, column=1)
entry_pass.grid(row=1, column=1)


def check_login():
global counter, entry_name, entry_pass
x = entry_name.get()
y = entry_pass.get()
if counter <= 5: # if counter 5 or less then check login info
if x == "Bob" and y == "mypassword":
print("Correct!")
else:
counter += 1 # add 1 to counter
print("Bad login! Please try again")
else:
print("Exceeded max attempt.")

tk.Button(root, text="Login", command=check_login).grid(row=2, column=0, columnspan=2)
root.mainloop()


mainloop()

mainloop()

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