如何使用Sqlalchemy中的automap_base处理AttributeError（key）？ [重复]

Question

这个问题在这里已有答案：

SQLAlchemy Automap does not create class for tables without primary key 1回答

请帮忙解决这个错误 - AttributeError（key）：

  File "pivot_table_measurements.py", line 1, in <module>
    from database import *
  File "/home/dedeco/Projetos/bigclima-project/database.py", line 24, in <module>
    MeasureRanges = Base.classes.measure_ranges
  File "/home/dedeco/craw/lib/python3.5/site-packages/sqlalchemy/util/_collections.py", line 212, in __getattr__
    raise AttributeError(key)
AttributeError: measure_ranges

database.朋友:

from sqlalchemy.ext.automap import automap_base
from sqlalchemy.orm import Session
from sqlalchemy import create_engine
from sqlalchemy.orm.exc import MultipleResultsFound, NoResultFound
import string
from decimal import Decimal

ECHO = False
AUTOFLUSH = False

Base = automap_base()

engine = create_engine('postgresql://user:pass@localhost:5432/clima', echo=ECHO)

Base.prepare(engine, reflect=True)

Country = Base.classes.countries
State = Base.classes.states
City = Base.classes.cities
Measurement = Base.classes.measurements
MeasurementHourly = Base.classes.measurements_hourly
MeasureRanges = Base.classes.measure_ranges
Parameter = Base.classes.parameters
WeatherStation = Base.classes.weather_stations

session = Session(engine, autoflush=AUTOFLUSH)

表measure_ranges退出数据库，但我不知道为什么我收到此错误。当我删除这一行（MeasureRanges = Base.classes.measure_ranges）时，我认为该错误与此表中的某些问题有关。