Password Manager GUI App using Python Tkinter, List comprehension, JSON data and Exception Handling

improvedpasswordJSON.py

from tkinter import *
from tkinter import messagebox
from random import choice, shuffle, randint
import pyperclip
import json


# ---------------------------- PASSWORD GENERATOR ------------------------------- #

def generate_password():
    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', '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 = [choice(letters) for _ in range(randint(8, 10))]
    password_symbol = [choice(symbols) for _ in range(randint(2, 4))]
    password_number = [choice(numbers) for _ in range(randint(2, 4))]

    password_list = password_letter + password_number + password_symbol

    shuffle(password_list)
    password_final = "".join(password_list)

    password_entry.insert(0, password_final)
    pyperclip.copy(password_final)


# ---------------------------- SAVE PASSWORD ------------------------------- #


def save():
    website = website_entry.get()
    email = email_entry.get()
    password_length = password_entry.get()
    new_data = {
        website: {
            "email": email,
            "password": password_length,
        }
    }

    if len(website) == 0 or len(password_length) == 0:
        messagebox.showwarning(title="Oops", message="Please enter the concerned fields")
    else:
        messagebox.askokcancel(title=website, message=f"These are the details entered \nEmail:{email}\n"f"Password:"
                                                      f"{password_length}\n""Is it okay to save?")
        try:
            with open("data.json", mode="r") as data_file:
                # Reading old data
                data = json.load(data_file)  # how to read JSON Data
        except FileNotFoundError:
            with open("data.json", "w") as data_file:
                json.dump(new_data, data_file, indent=4)  # how to write JSON Data
        else:
            # Updating old data with new data
            data.update(new_data)  # Saving updated data

            with open("data.json", mode="w") as data_file:
                json.dump(data, data_file, indent=4)
        finally:
            website_entry.delete(0, END)
            password_entry.delete(0, END)


# ---------------------------- FIND PASSWORD  ------------------------------- #
def find_password():
    website = website_entry.get()
    try:
        with open("data.json", mode="r") as data_file:
            data = json.load(data_file)

    except FileNotFoundError:
        messagebox.showinfo(title="Error", message="No Data file found")

    else:
        if website in data:
            email = data[website]["email"]
            password = data[website]["password"]
            messagebox.showinfo(title=website, message=f"Email: {email}\n password: {password}")
        else:
            messagebox.showinfo(title="Error", message=f"No details found for {website}")

# ---------------------------- UI SETUP ------------------------------- #


window = Tk()
window.title("Password Manager GUI")
window.config(padx=50, pady=50, bg="white")

canvas = Canvas(width=200, height=200, bg="white", highlightthickness=0)

lock_image = PhotoImage(file="logo.png")

canvas.create_image(100, 100, image=lock_image)
canvas.grid(column=1, row=0)

website_entry = Entry(width=35)
website_entry.grid(column=1, row=1, columnspan=2)
website_entry.focus()  # cursor will jump straight into the entry box

website_label = Label(text="Website", bg="white", fg="black")
website_label.grid(column=0, row=1)

email_entry = Entry(width=20)
email_entry.grid(column=1, row=2)
email_entry.insert(0, "sayie@gmail.com")

email_label = Label(text="Email/Username:", bg="white", fg="black")
email_label.grid(column=0, row=2)

password_entry = Entry(width=21)
password_entry.grid(column=1, row=3)

password_label = Label(text="Password:", bg="white", fg="black")
password_label.grid(column=0, row=3)

password_generate_button = Button(text="Generate password", bg="white", fg="black", command=generate_password)
password_generate_button.grid(column=2, row=3)

add_button = Button(text="Add", width=36, bg="white", fg="black", command=save)
add_button.grid(column=1, row=4, columnspan=2)

search_button = Button(text="Search", width=13, bg="white", fg="black", command=find_password)
search_button.grid(column=3, row=1)

window.mainloop()