Password_Manager.py

from cryptography.fernet import Fernet #fernet is use to encrypt and decrypt password
import os #use to interact the other file in program


def write_key():
    key = Fernet.generate_key() #create a new random secret key
    with open("key.key", "wb") as f: #open a file key.key in write binary mode
        f.write(key) #write the key

#return the secret key from key.key
def load_key():
    with open("key.key", "rb") as f:
        return f.read()

# Generate key if not present
if not os.path.exists("key.key"): #check if the file or folder exist at given path
    write_key() #create the key file

key = load_key() #load the key
fer = Fernet(key) #create Ferne object as named fer

def add():
    name = input("Account: ")
    pwd = input("Password: ")
    with open("Passwords.txt", "a") as f:
        f.write(f"{name} | {fer.encrypt(pwd.encode()).decode()}\n")

def view():
    if not os.path.exists("Passwords.txt"):
        print("No passwords saved yet.")
        return
    with open("Passwords.txt", "r") as f:
        for line in f.readlines():
            if "|" not in line:
                continue
            u, p = line.strip().split("|")
            print(f"User: {u.strip()} | Password: {fer.decrypt(p.strip().encode()).decode()}")

while True:
    mode = input("(view, add), q to quit: ").lower()
    if mode == "q":
        break
    elif mode == "view":
        view()
    elif mode == "add":
        add()
    else:
        print("Invalid mode")