Summary

• Built a password manager with JSON data storage and exception handling
• Implemented search functionality to find stored website credentials
• Added error handling for missing data files and non-existent website entries
• Created user-friendly interface with proper grid layout and matching button sizes

Resources

Notes\ Code

We’ve just finished implementing JSON as the storage mechanism for our password manager, and addressing the FileNotFoundError that occurs if the JSON file is missing/not created yet. Here is the current state of the code.

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_letters = [choice(letters) for _ in range(randint(8, 10))]
    password_numbers = [choice(numbers) for _ in range(randint(2, 4))]
    password_symbols = [choice(symbols) for _ in range(randint(2, 4))]

    password_list = (password_letters + password_numbers + password_symbols)
    shuffle(password_list)

    password = "".join(password_list)
    password_entry.insert(0, password)
    pyperclip.copy(password)

# ---------------------------- SAVE PASSWORD ------------------------------- #
def save():
    website = website_entry.get()
    email = email_entry.get()
    password = password_entry.get()
    new_data = {
        website: {
            "email": email,
            "password": password
        }
    }

    if len(password) == 0 or len(website) == 0:
        messagebox.showinfo(title="Oops!", message="Please don't leave any fields empty!")

    else:
        try:
            with open("data.json", "r") as data_file:
                data = json.load(data_file)

        except FileNotFoundError:
            with open("data.json", "w") as data_file:
                json.dump(new_data, data_file, indent=4)

        else:
            data.update(new_data)
            with open("data.json", "w") as data_file:
                json.dump(data, data_file, indent=4)

        finally:
                website_entry.delete(0, END)
                password_entry.delete(0, END)

# ---------------------------- UI SETUP ------------------------------- #
window = Tk()
window.title("Password Manager")
window.config(padx=20, pady=20)

canvas = Canvas(width=200, height=200)
logo_img = PhotoImage(file="logo.png")
canvas.create_image(100,100, image=logo_img)
canvas.grid(row=0, column=1)\\

#Website
website_label = Label(text="Website: ")
website_label.grid(row=1, column=0, sticky="E")
website_entry = Entry(width=35)
website_entry.grid(row=1, column=1, columnspan=2, sticky="EW")
website_entry.focus()

#Email
email_label = Label(text="Email/Username: ")
email_label.grid(row=2, column=0, sticky="E")
email_entry = Entry(width=35)
email_entry.insert(END, "[email protected]")
email_entry.grid(row=2, column=1, columnspan=2, sticky="EW")

#Password
password_label = Label(text="Password: ")
password_label.grid(row=3, column=0, sticky="E")
password_entry = Entry(width=21)
password_entry.grid(row=3, column=1, padx=0, pady=0, sticky="EW")

#Generate Password
gen_pass_button = Button(text="Generate Password", command=generate_password)
gen_pass_button.grid(row=3, column=2, sticky="EW")

#Add Password
add_password_button = Button(text="Add Password", width=36, command=save)
add_password_button.grid(row=4, column=1, columnspan=2, sticky="EW")

window.mainloop()

Now we want to add search functionality and a search button to load the password the user request. There are quite a few small task to accomplish this, but nothing we haven’t seen before. Lets get to it.

Tasks

1. Add a “Search” button next to the website entry field
2. Adjust the layout and the other widgets as needed to get desired look
3. Create a function called find_password() that gets triggered when the “Search” button is pressed
4. Check if the user’s text entry matches an item in the data.json
5. If yes, show a messagebox with the website’s name and password
6. Catch an exception that might occur trying to access the data.json showing a messagebox with the text “No Data File Found”