from sqlalchemy import create_engine, Column, Integer, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

# Inicjalizacja BD
engine = create_engine("sqlite:///mojabaza.db", echo=True)
Base = declarative_base()

# Schemat BD
class User(Base):
    __tablename__ = "user"
    id = Column(Integer, primary_key=True, autoincrement=True)
    username = Column(String, index=True)
    password = Column(String)

    def __init__(self, username, password):
        self.username = username
        self.password = password

# Metoda do tworzenia sesji...
def create_db_session():
    Session = sessionmaker(bind=engine)
    session = Session()

    return session

Base.metadata.create_all(engine)