我在Windows操作系统和Python 3.6.4上遇到了一个问题，试图使用SQLAlchemy 1.2.5连接到DSN数据源
使用pyodbc连接到DSN数据源工作得很好但是使用SQLAlchemy create_engine方法：
engine = create_engine("mssql+pyodbc://user:pass@mydsn", echo=True)
给我以下错误：
File "mentrix.py", line 28, in <module>
cnxn = engine.connect()
TypeError: '<' not supported between instances of 'str' and 'int'
任何人都可以指出我正确的方向。就像我说我试图使用SQLAlchemy连接到InterSystem ODBC35 DSN数据源。
先谢谢！
代码：
from sqlalchemy import create_engine
import pyodbc
engine = create_engine("mssql+pyodbc://user:pass@mydsn", echo=True)
cnxn = engine.connect()
rows = cnxn.execute("SELECT name FROM sys.tables").fetchall()
print(rows)
完整追溯：
2018-03-29 11:33:44,631 INFO sqlalchemy.engine.base.Engine SELECT CAST(SERVERPROPERTY('ProductVersion') AS VARCHAR)
2018-03-29 11:33:44,631 INFO sqlalchemy.engine.base.Engine ()
Traceback (most recent call last):
File "mentrix.py", line 28, in <module>
cnxn = engine.connect()
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\engine\base.py", line 2102, in connect
return self._connection_cls(self, **kwargs)
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\engine\base.py", line 90, in __init__
if connection is not None else engine.raw_connection()
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\engine\base.py", line 2188, in raw_connection
self.pool.unique_connection, _connection)
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\engine\base.py", line 2158, in _wrap_pool_connect
return fn()
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\pool.py", line 345, in unique_connection
return _ConnectionFairy._checkout(self)
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\pool.py", line 784, in _checkout
fairy = _ConnectionRecord.checkout(pool)
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\pool.py", line 532, in checkout
rec = pool._do_get()
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\pool.py", line 1189, in _do_get
self._dec_overflow()
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\util\langhelpers.py", line 66, in __exit__
compat.reraise(exc_type, exc_value, exc_tb)
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\util\compat.py", line 187, in reraise
raise value
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\pool.py", line 1186, in _do_get
return self._create_connection()
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\pool.py", line 350, in _create_connection
return _ConnectionRecord(self)
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\pool.py", line 477, in __init__
self.__connect(first_connect_check=True)
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\pool.py", line 677, in __connect
exec_once(self.connection, self)
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\event\attr.py", line 274, in exec_once
self(*args, **kw)
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\event\attr.py", line 284, in __call__
fn(*args, **kw)
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\util\langhelpers.py", line 1334, in go
return once_fn(*arg, **kw)
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\engine\strategies.py", line 183, in first_connect
dialect.initialize(c)
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\dialects\mssql\base.py", line 1931, in initialize
super(MSDialect, self).initialize(connection)
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\engine\default.py", line 267, in initialize
self._get_default_schema_name(connection)
File "C:\Users\m.m\Envs\mentrix\lib\site-packages\sqlalchemy\dialects\mssql\base.py", line 1958, in _get_default_schema_name
if self.server_version_info < MS_2005_VERSION:
TypeError: '<' not supported between instances of 'str' and 'int'