Postgresql 属性错误：'；解析结果'；对象没有属性'；drivername'；

在Heroku上运行应用程序时，我面临一个问题。本地版本似乎工作正常，但我无法在heroku平台上调用

create_db（）

这是错误跟踪

(venv)S-MBP:LaunchPage3 S$ heroku run python
Running python on herokuapp... up, run.5609
Python 2.7.11 (default, Dec  7 2015, 21:16:24) 
[GCC 4.8.4] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from app import db
>>> db.create_all()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/app/.heroku/python/lib/python2.7/site-packages/flask_sqlalchemy/__init__.py", line 972, in create_all
self._execute_for_all_tables(app, bind, 'create_all')
File "/app/.heroku/python/lib/python2.7/site-packages/flask_sqlalchemy/__init__.py", line 964, in _execute_for_all_tables
op(bind=self.get_engine(app, bind), **extra)
File "/app/.heroku/python/lib/python2.7/site-packages/flask_sqlalchemy/__init__.py", line 910, in get_engine
return connector.get_engine()
File "/app/.heroku/python/lib/python2.7/site-packages/flask_sqlalchemy/__init__.py", line 542, in get_engine
self._sa.apply_driver_hacks(self._app, info, options)
File "/app/.heroku/python/lib/python2.7/site-packages/flask_sqlalchemy/__init__.py", line 846, in apply_driver_hacks
if info.drivername.startswith('mysql'):
AttributeError: 'ParseResult' object has no attribute 'drivername'

---

任何指点都将不胜感激。我试着照做，但这些答案没有帮助

尝试将导入URL解析更改为：

from urlparse import urlparse

---

尝试将导入URL解析更改为：

from urlparse import urlparse