database.py

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import scoped_session, sessionmaker


engine = create_engine('sqlite:///mydb.db', echo=True)
db_session = scoped_session(sessionmaker(autocommit=False, autoflush=False, bind=engine))
Base = declarative_base()
Base.query = db_session.query_property()

def init_db():
    # import all modules here that might define models so that
    # they will be registered properly on the metadata.  Otherwise
    # you will have to import them first before calling init_db()
    import models
    Base.metadata.create_all(bind=engine)
    # print("CREATED DATABASE SUCCESSFULLY")
    from models import User
    new_user_1 = User("dinesh","Dinesh@123$","dinesh","shetty")
    new_user_2 = User("jack","Jack@123$","jack","apples")

    db_session.add(new_user_1)
    db_session.add(new_user_2)

    db_session.commit()