Login Application and Validating info using Kivy GUI and Pandas in Python

Login Application and Validating info using Kivy GUI and Pandas in Python

Creating a simple login application using Kivy GUI and validating the credentials using a pandas DataFrame can be an engaging way to understand GUI development and data handling. Below is a basic example to get you started:

  • Prepare the Data:

Let's assume you have a simple CSV file users.csv with usernames and passwords:

username,password
user1,pass1
user2,pass2
user3,pass3
  • Develop the Login Application:
import pandas as pd
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.label import Label
from kivy.uix.textinput import TextInput
from kivy.uix.button import Button
from kivy.uix.popup import Popup

class LoginApp(App):

    def build(self):
        self.df = pd.read_csv('users.csv')
        self.box = BoxLayout(orientation='vertical')
        
        self.username = TextInput(hint_text='Enter Username', multiline=False)
        self.password = TextInput(hint_text='Enter Password', password=True, multiline=False)
        
        btn = Button(text="Login")
        btn.bind(on_press=self.validate_user)
        
        self.box.add_widget(self.username)
        self.box.add_widget(self.password)
        self.box.add_widget(btn)
        
        return self.box

    def validate_user(self, instance):
        user = self.username.text
        pwd = self.password.text
        
        # Check if user exists in the DataFrame
        valid_user = self.df[(self.df['username'] == user) & (self.df['password'] == pwd)]
        
        if not valid_user.empty:
            popup = Popup(title='Login Successful',
                          content=Label(text='Welcome, {}!'.format(user)),
                          size_hint=(None, None), size=(200, 200))
        else:
            popup = Popup(title='Login Failed',
                          content=Label(text='Invalid Credentials'),
                          size_hint=(None, None), size=(200, 200))
        
        popup.open()

if __name__ == "__main__":
    LoginApp().run()

When you run the code, it will present a simple Kivy window where you can input a username and password. On pressing the "Login" button, it will check the credentials against the data in users.csv and display a popup message indicating if the login was successful or failed.

Make sure to have Kivy and pandas installed:

pip install kivy pandas

This example is basic and is meant for demonstration purposes. In real-world applications, passwords should never be stored in plain text and should be securely hashed.

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