AttributeError: 'module' object has no attribute 'decrypt_pwd'

Question

I need some help with this error, I have created a class User in my store_user_db.py file which basically store an encrypted password in the db using Fernet cryptography library. After the password is stored I need a function that decrypt the password so I have created a def decrypt_pwd function in the User class as below, the problem is that when I try to call this function from py other form.py file after importing the store_user_db with User class, it return the error:'module' object has no attribute 'decrypt_pwd'

Have I missed something? please edit my code in the correct way if you can.

#store_user_db.py
app = Flask(__name__)
app.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///data-users2.sqlite"
db = SQLAlchemy(app)


class User(db.Model):
    __tablename__ = "user"
    id = db.Column(db.Integer(), primary_key=True, autoincrement=True)
    username = db.Column(db.String(64), unique=True)
    pwd = db.Column(db.LargeBinary(), unique=True)

    def __init__(self, id, username, pwd):
        key = Fernet.generate_key()
        f = Fernet(key)
        token = f.encrypt(pwd)
        self.id = id
        self.username = username
        self.pwd = f.encrypt(pwd)

        def decrypt_pwd(self):
            p = db.session.query(User).filter_by(username="ita_itf").first()
            DESTINATION_PSW = f.decrypt(p.pwd)
            return DESTINATION_PSW

here I call the function:

        #form.py
        from store_user_db import User, db 
        import store_user_db
        
        DICP_FTP_DESTINATION_PSW = store_user_db.decrypt_pwd()

ERROR:

AttributeError: 'module' object has no attribute 'decrypt_pwd'

Answer 1

try this code:

#store_user_db.py
class User(db.Model):
    __tablename__ = "user"
    id = db.Column(db.Integer(), primary_key=True, autoincrement=True)
    username = db.Column(db.String(64), unique=True)
    pwd = db.Column(db.LargeBinary(), unique=True)

    def __init__(self, username, pwd):
        self.username = username
        self.pwd = f.encrypt(pwd)

    
def decrypt_pwd():
    key = Fernet.generate_key()
    f = Fernet(key)
    token = f.encrypt(pwd)
    p = db.session.query(User).filter_by(username="ita_itf").first()
                DESTINATION_PSW = f.decrypt(p.pwd)
                return DESTINATION_PSW

#form.py
from store_user_db import decrypt_pwd
DICP_FTP_DESTINATION_PSW = decrypt_pwd()