python:sqlalchemy.exc.operationalerror:< unprintable operationalerror object>

我编写了下面的代码来创建一个网络爬虫（用scrapy详细说明），我想把这些数据放在一个数据库中，一个是mysql。为此，我使用了管道文件并进行了以下配置：
管道.py：

class ScrapySpiderPipeline(object):
   def __init__(self):

     engine = db_connect()
     create_table(engine)
     self.Session = sessionmaker(bind=engine)

  def process_item(self, item, spider):

     session = self.Session()
     quotedb = QuoteDB()
     quotedb.Titulo = item["Titulo"]
     quotedb.Tipo_Negocio = item["Tipo_Negocio"]
     quotedb.Preco = item["Preco"]
     quotedb.Tipo_Imovel = item["Tipo_Imovel"]

  try:
     session.add(quotedb)
     session.commit()
  except:
     session.rollback()
     raise
  finally:
     session.close()

  return item

型号.py：

from scrapy.utils.project import get_project_settings

DeclarativeBase = declarative_base()

def db_connect():
return create_engine(get_project_settings().get("CONNECTION_STRING"))

def create_table(engine):
   DeclarativeBase.metadata.create_all(engine)

class QuoteDB(DeclarativeBase):
   __tablename__ = "imovel_table"

   id = Column(Integer, primary_key=True)
   Titulo = Column('Titulo', VARCHAR(200))
   Tipo_Negocio = Column('Tipo_Negocio', String(100))
   Preco = Column('Preco', Text())
   Tipo_Imovel = Column('Tipo_Imovel', Text())

print(QuoteDB.__table__)

项目.py：

class QuoteItem(scrapy.Item):
  Titulo = scrapy.Field()
  Tipo_Negocio = scrapy.Field()
  Preco = scrapy.Field()
  Tipo_Imovel = scrapy.Field()

设置.py：

ITEM_PIPELINES = {
   'novo.pipelines.ScrapySpiderPipeline' : 300,
}

CONNECTION_STRING = "{drivername}://{user}:{passwd}@{host}:{port}/{db_name}?charset=utf8".format(
   drivername="mysql",
   user="root",
   passwd="",
   host="localhost",
   port="3306",
   db_name="projeto",
)

爬虫.py：

class SapoSpider(scrapy.Spider):
  name = "imoveis"
  allowed_domains = ["maisconsultores.pt"]
  start_urls = ["https://www.maisconsultores.pt/properties?page=%d&s=eedce" % i for i in range(23)]

def parse(self,response):
   subpage_links = []

   for i in response.css('div.item.col-sm-4'):
       youritem = {
       'Titulo':i.css('div[class=image] h3::text').extract(),
       'Tipo_Negocio':i.css('div.price::text').re('[^\t\n\r\a]+'),
       'Preco':i.css('div.price span::text').extract(),
       }

    subpage_link = i.css('div[class=image] a::attr(href)').extract_first()
    full_url = response.urljoin(subpage_link)
    yield scrapy.Request(full_url, callback=self.parse_subpage, meta={'item':youritem})

def parse_subpage(self,response):
    youritem = response.meta.get('item')
    youritem['Tipo_Imovel'] = response.xpath('//ul[@class="amenities"]//li[1]/text()').extract()
    yield youritem

有人能告诉我错误在哪里吗？我在里面呆了很长时间，却找不到它。你知道吗？如果有人能帮我，我会很感激的！
回溯：

2018-06-27 17:17:04 [scrapy.core.engine] DEBUG: Crawled (200) <GET https://www.maisconsultores.pt/1651/apartamento-t2-em-linda-a-velha> (referer: https://www.maisconsultores.pt/properties?page=18&s=eedce)
2018-06-27 17:17:04 [scrapy.core.scraper] ERROR: Error processing {'Titulo': ['Apartamento T2 em Linda-a-Velha '], 'Tipo_Negocio': ['                                            Venda', '                                            ', '                                        '], 'Preco': ['240 000€', 'Novo Preço!'], 'Localizacao': [' Algés (Algés)'], 'Tipo_Imovel': [' Apartamento'], 'Condicao': [' Usado'], 'Numero_Divisoes': [' 3'], 'Numero_Quartos': [' 2'], 'Numero_Casas_Banho': [' 1'], 'Certificado_Energetico': ' Avaliação em Curso', 'Ano_Construcao': ' 1980', 'Area_Util': '                                                ', 'Area_Bruta': '                                                    ', 'Piso': ['                                                                                                            2º andar', '                                                                                                    ']}

Traceback (most recent call last):
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\engine\base.py", line 1193, in _execute_context
    context)
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\engine\default.py", line 508, in do_execute
    cursor.execute(statement, parameters)
  File "C:\Users\joani\Anaconda3\lib\site-packages\MySQLdb\cursors.py", line 250, in execute
    self.errorhandler(self, exc, value)
  File "C:\Users\joani\Anaconda3\lib\site-packages\MySQLdb\connections.py", line 50, in defaulterrorhandler
    raise errorvalue
  File "C:\Users\joani\Anaconda3\lib\site-packages\MySQLdb\cursors.py", line 247, in execute
    res = self._query(query)
  File "C:\Users\joani\Anaconda3\lib\site-packages\MySQLdb\cursors.py", line 411, in _query
    rowcount = self._do_query(q)
  File "C:\Users\joani\Anaconda3\lib\site-packages\MySQLdb\cursors.py", line 374, in _do_query
    db.query(q)
  File "C:\Users\joani\Anaconda3\lib\site-packages\MySQLdb\connections.py", line 277, in query
    _mysql.connection.query(self, query)
_mysql_exceptions.OperationalError: (1241, 'Operand should contain 1 column(s)')

上述异常是以下异常的直接原因：

Traceback (most recent call last):
  File "C:\Users\joani\Anaconda3\lib\site-packages\twisted\internet\defer.py", line 653, in _runCallbacks
    current.result = callback(current.result, *args,**kw)
  File "C:\Users\joani\Desktop\outra_tentativa\novo\novo\pipelines.py", line 111, in process_item
    session.commit()
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\orm\session.py", line 943, in commit
    self.transaction.commit()
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\orm\session.py", line 467, in commit
    self._prepare_impl()
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\orm\session.py", line 447, in _prepare_impl
    self.session.flush()
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\orm\session.py", line 2254, in flush
    self._flush(objects)
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\orm\session.py", line 2380, in _flush
    transaction.rollback(_capture_exception=True)
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\util\langhelpers.py", line 66, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\util\compat.py", line 187, in reraise
    raise value
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\orm\session.py", line 2344, in _flush
    flush_context.execute()
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\orm\unitofwork.py", line 391, in execute
    rec.execute(self)
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\orm\unitofwork.py", line 556, in execute
    uow
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\orm\persistence.py", line 181, in save_obj
    mapper, table, insert)
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\orm\persistence.py", line 866, in _emit_insert_statements
    execute(statement, params)
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\engine\base.py", line 948, in execute
    return meth(self, multiparams, params)
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\sql\elements.py", line 269, in _execute_on_connection
    return connection._execute_clauseelement(self, multiparams, params)
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\engine\base.py", line 1060, in _execute_clauseelement
    compiled_sql, distilled_params
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\engine\base.py", line 1200, in _execute_context
    context)
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\engine\base.py", line 1413, in _handle_dbapi_exception
    exc_info
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\util\compat.py", line 203, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb, cause=cause)
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\util\compat.py", line 186, in reraise
    raise value.with_traceback(tb)
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\engine\base.py", line 1193, in _execute_context
    context)
  File "C:\Users\joani\Anaconda3\lib\site-packages\sqlalchemy\engine\default.py", line 508, in do_execute
    cursor.execute(statement, parameters)
  File "C:\Users\joani\Anaconda3\lib\site-packages\MySQLdb\cursors.py", line 250, in execute
    self.errorhandler(self, exc, value)
  File "C:\Users\joani\Anaconda3\lib\site-packages\MySQLdb\connections.py", line 50, in defaulterrorhandler
    raise errorvalue
  File "C:\Users\joani\Anaconda3\lib\site-packages\MySQLdb\cursors.py", line 247, in execute
    res = self._query(query)
  File "C:\Users\joani\Anaconda3\lib\site-packages\MySQLdb\cursors.py", line 411, in _query
    rowcount = self._do_query(q)
  File "C:\Users\joani\Anaconda3\lib\site-packages\MySQLdb\cursors.py", line 374, in _do_query
    db.query(q)
  File "C:\Users\joani\Anaconda3\lib\site-packages\MySQLdb\connections.py", line 277, in query
    _mysql.connection.query(self, query)
sqlalchemy.exc.OperationalError: <unprintable OperationalError object>

python:sqlalchemy.exc.operationalerror:< unprintable operationalerror object>

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