如果我尝试执行from sqlalchemy.ext.declarative import *
它会失败。我试过卸载软件包pip uninstall sqlalchemy
并重新安装。我已尝试从 Ubuntu 存储库(-package python-sqlalchemy
)中删除该版本,但未安装。我已经到一个干净的目录并尝试了相同的命令。还是不行。这适用于 sqlalchemy 0.7.8 和 0.7.9。
这是回溯:
In [1]: from sqlalchemy.ext.declarative import *
---------------------------------------------------------------------------
AttributeError Traceback (most recent call last)
/home/nine/slask/<ipython-input-1-7f210e4ec48b> in <module>()
----> 1 from sqlalchemy.ext.declarative import *
/usr/local/lib/python2.7/dist-packages/sqlalchemy/ext/declarative/__init__.py in <module>()
1252 """
1253
-> 1254 from .api import declarative_base, synonym_for, comparable_using, \
1255 instrument_declarative, ConcreteBase, AbstractConcreteBase, \
1256 DeclarativeMeta, DeferredReflection, has_inherited_table,\
/usr/local/lib/python2.7/dist-packages/sqlalchemy/ext/declarative/api.py in <module>()
101
102
--> 103 class declared_attr(interfaces._MappedAttribute, property):
104 """Mark a class-level method as representing the definition of
105 a mapped property or special declarative member name.
AttributeError: 'module' object has no attribute '_MappedAttribute'
作为记录,我正在运行 Ubuntu 12.04。