Python - Project - Password Manager (Day 29)

This is a 100 Days challenge to learn a new language (Python). 100 Days of Code - The Complete Python Pro Bootcamp 

I will post some notes to motivate myself to finish this challenge.

Goal

Create a GUI program to manage password.

* generate password randomly

* show dialog for user confirmation and form validation error

* save user info into the file system

Tkinter - Grid - Layout

*columnspan: How many columns widget occupies; default 1.

Ex: 

import tkinter as tk

# Init

root = tk.Tk()

root.title("Exp")

root.config(padx=20, pady=20)

root.minsize(width=200, height=200)

# Init Button

button_1 = tk.Button(text="1", bg="red")

button_1.grid(column=0, row=0)

button_2 = tk.Button(text="2", bg="blue")

button_2.grid(column=1, row=0)

button_3 = tk.Button(text="3", bg="green")

button_3.grid(column=2, row=0)

button_4 = tk.Button(text="4", bg="yellow")

button_4.grid(column=0, row=3)

button_5 = tk.Button(text="5", bg="purple")

# Make this button widget to occupy 2 columns

button_5.grid(column=1, row=2, columnspan=2)

# Start the Event Loop

root.mainloop()

Result:

Manipulate Entry

focus()

get()

insert(0, 'text')

delete(0, END)

Ex: 

import tkinter as tk

def get():

    """Get entry value"""

    print(f"Get: {entry.get()}")

def set_value():

    """Update entry value"""

    entry.delete(0, tk.END)

    entry.insert(0, "HIHI")

def delete():

    """Clear text of entry"""

    entry.delete(0, tk.END)

# Init

root = tk.Tk()

# Init ENtry

entry = tk.Entry()

entry.insert(0, "Hello World")

entry.focus()

entry.pack()

# Init Button

get_button = tk.Button(text="Get", command=get)

get_button.pack()

set_value_button = tk.Button(text="Set", command=set_value)

set_value_button.pack()

delete_button = tk.Button(text="Delete", command=delete)

delete_button.pack()

# Start the Event Loop

root.mainloop()

Tkinter - messagebox

Reference

Combine elements of a List into a string

*join()

Ex: Regular

my_list = ["h", "e", "l", "l", "o"]

new_str = ""

for char in my_list:

    new_str += char

print(new_str)

Ex: Using join()

my_list = ["h", "e", "l", "l", "o"]

new_str = "".join(my_list)

print(new_str)

How to copy text to clipboard

Reference

Project - Password Manager

Ex:

import random

import tkinter as tk

from tkinter import messagebox

import pyperclip

def copy_to_clipboard(message):

    """Use pyperclip library to copy message to clipboard"""

    pyperclip.copy(message)

def generate_password():

    """Generate random password and show it to GUI"""

    letters = [

        "a", "b", "c", "d", "e", "f", "g", "h", "i", "j",

        "k", "l", "m", "n", "o", "p", "q", "r", "s", "t",

        "u", "v", "w", "x", "y", "z",

    ]

    numbers = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9"]

    symbols = ["!", "#", "$", "%", "&", "(", ")", "*", "+"]

    password_letter_list = [

        random.choice(letters) for _ in range(random.randint(8, 10))

    ]

    password_symbols_list = [

        random.choice(symbols) for _ in range(random.randint(2, 4))

    ]

    password_numbers_list = [

        random.choice(numbers) for _ in range(random.randint(2, 4))

    ]

    password_list = password_letter_list + password_symbols_list +

password_numbers_list

    random.shuffle(password_list)

    password = "".join(password_list)

    pwd_entry.insert(0, password)

    copy_to_clipboard(password)

def save():

    """Save user info to the file system"""

    website = website_entry.get()

    username = username_entry.get()

    pwd = pwd_entry.get()

    # Form Validation

    if len(website) == 0 or len(username) == 0 or len(pwd) == 0:

        messagebox.showerror(

            title="Info", message="Please make sure to enter all fields"

        )

        return

    # Pop-up confirmation

    is_ok = messagebox.askokcancel(

        title=website,

        message=f"Is that ok to save {username} / {pwd} ?",

    )

    if is_ok:

        # Use with statement to open a file

        with open("data.txt", encoding="utf-8", mode="a") as file:

            file.write(f"{website} | {username} | {pwd}\n")

        # Clear User Input

        website_entry.delete(0, tk.END)

        pwd_entry.delete(0, tk.END)

# Init

root = tk.Tk()

root.title("Password Manager")

root.config(padx=50, pady=50)

# Init canvas

canvas = tk.Canvas(width=200, height=200)

logo_image = tk.PhotoImage(file="logo.png")

canvas.create_image(100, 100, image=logo_image)

canvas.grid(column=1, row=0)

# Website

website_label = tk.Label(text="Website:")

website_label.grid(column=0, row=1)

website_entry = tk.Entry()

website_entry.grid(sticky="ew", column=1, row=1, columnspan=2)

# Focus entry

website_entry.focus()

# Email/Username

username_lable = tk.Label(text="Email/Username:")

username_lable.grid(column=0, row=2)

username_entry = tk.Entry()

username_entry.grid(sticky="ew", column=1, row=2, columnspan=2)

username_entry.insert(0, "frank@demo.com")

# Password

pwd_lable = tk.Label(text="Password:")

pwd_lable.grid(column=0, row=3)

pwd_entry = tk.Entry()

pwd_entry.grid(sticky="ew", column=1, row=3)

# PWD Generation Btn

generate_pwd_btn = tk.Button(text="Generate Password",

command=generate_password)

generate_pwd_btn.grid(sticky="ew", column=2, row=3)

# Add Btn

add_btn = tk.Button(text="Add", command=save)

add_btn.grid(sticky="ew", column=1, row=4, columnspan=2)

# Start the Event Loop

root.mainloop()