ImportError:无法导入名称“PY2”

Question

想要使用SQLalchemy连接到雪花。创建雪花引擎时出现以下错误：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\mithi\AppData\Local\Programs\Python\Python38-32\lib\site-packages\sqlalchemy\engine\__init__.py", line 479, in create_engine
    return strategy.create(*args, **kwargs)
  File "C:\Users\mithi\AppData\Local\Programs\Python\Python38-32\lib\site-packages\sqlalchemy\engine\strategies.py", line 61, in create
    entrypoint = u._get_entrypoint()
  File "C:\Users\mithi\AppData\Local\Programs\Python\Python38-32\lib\site-packages\sqlalchemy\engine\url.py", line 172, in _get_entrypoint
    cls = registry.load(name)
  File "C:\Users\mithi\AppData\Local\Programs\Python\Python38-32\lib\site-packages\sqlalchemy\util\langhelpers.py", line 222, in load
    return self.impls[name]()
  File "C:\Users\mithi\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pkg_resources\__init__.py", line 2443, in load
    return self.resolve()
  File "C:\Users\mithi\AppData\Local\Programs\Python\Python38-32\lib\site-packages\pkg_resources\__init__.py", line 2449, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "C:\Users\mithi\AppData\Local\Programs\Python\Python38-32\lib\site-packages\snowflake\sqlalchemy\__init__.py", line 12, in <module>
    from .util import _url as URL
  File "C:\Users\mithi\AppData\Local\Programs\Python\Python38-32\lib\site-packages\snowflake\sqlalchemy\util.py", line 9, in <module>
    from snowflake.connector.compat import (PY2, IS_STR)
ImportError: cannot import name 'PY2' from 'snowflake.connector.compat' (C:\Users\mithi\AppData\Local\Programs\Python\Python38-32\lib\site-packages\snowflake\connector\compat.py)

引擎创建代码如下所示：

from sqlalchemy import create_engine
from sqlalchemy.engine.url import URL
create_engine(URL("snowflake", username="***",password="***",host="***"))

Answer 1

我在tested requirements page匹配了所有依赖项。我用pip install upgrade snowflake-sqlalchemy解决了这个问题。我运行的Python 3.7.6版本为2.2.1{}

Answer 2

它似乎与snowflake-connector-python版本2.2.0的发布有关。将它设置为<2.2.0为我修复了它