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

engine = create_engine('sqlite:///microphones.db', echo=True)
Base = declarative_base()


class Manufacturer(Base):
    __tablename__ = 'manufacturer'

    id = Column(Integer, primary_key=True)
    name = Column(String)
    microphones = relationship('Microphone', backref='manufacturer')

    def __init__(self, name):
        self.name = name


class Microphone(Base):
    __tablename__ = 'microphone'

    id = Column(Integer, primary_key=True)
    name = Column(String)
    comment = Column(String)

    manufacturer_id = Column(Integer, ForeignKey('manufacturer.id'))


    def __init__(self, name, comment=''):
        self.name = name
        self.comment = comment


Base.metadata.create_all(engine)

Session = sessionmaker(bind=engine)
session = Session()

manufacturer_test = Manufacturer('Neumann')
manufacturer_test.microphones.extend(Microphone('KM 1')) # <------- FEHLER

session.add(manufacturer_test)
session.commit()

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TypeError: 'Microphone' object is not iterable

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for item in Microphone('KM 1'):
    print item