在Python项目中运行出现了“AttributeError: ResourceManager instance has no attribute ‘_warn_unsafe_extraction'”问题，研究了一下，发现是setuptools在MacOS下的一个问题（见下图），我出现问题的是pymongo的库，需要删除pymongo，然后降级setuptools再重新安装。
解决方法：
1、删除pymongo：
sudo easy_install -mxN pmongo
2、降级setuptools：
sudo easy_install -mxN setuptools sudo easy_install "setuptools<0.7"
3、重装pymongo：
sudo easy_install pymongo
问题解决！！！！！
附错误信息：
/System/Library/Frameworks/Python.framework/Versions/2.7/bin/python /Users/yourtion/Codes/python/knowme/server.py Traceback (most recent call last): File "/Users/yourtion/Codes/python/knowme/server.py", line 5, in <module> from Handler.api import UserHandler File "/Users/yourtion/Codes/python/knowme/Handler/api.py", line 3, in <module> from Model.user import User File "/Users/yourtion/Codes/python/knowme/Model/user.py", line 2, in <module> from mongoengine import * File "build/bdist.macosx-10.9-intel/egg/mongoengine/__init__.py", line 1, in <module> File "build/bdist.macosx-10.9-intel/egg/mongoengine/document.py", line 4, in <module> File "/Library/Python/2.7/site-packages/pymongo-2.6.3-py2.7-macosx-10.8-intel.egg/pymongo/__init__.py", line 80, in <module> File "/Library/Python/2.7/site-packages/pymongo-2.6.3-py2.7-macosx-10.8-intel.egg/pymongo/connection.py", line 39, in <module> File "/Library/Python/2.7/site-packages/pymongo-2.6.3-py2.7-macosx-10.8-intel.egg/pymongo/mongo_client.py", line 44, in <module> File "/Library/Python/2.7/site-packages/pymongo-2.6.3-py2.7-macosx-10.8-intel.egg/bson/__init__.py", line 41, in <module> File "/Library/Python/2.7/site-packages/pymongo-2.6.3-py2.7-macosx-10.8-intel.egg/bson/_cbson.py", line 7, in <module> File "/Library/Python/2.7/site-packages/pymongo-2.6.3-py2.7-macosx-10.8-intel.egg/bson/_cbson.py", line 4, in __bootstrap__ File "build/bdist.macosx-10.9-intel/egg/pkg_resources.py", line 914, in resource_filename %s File "build/bdist.macosx-10.9-intel/egg/pkg_resources.py", line 1601, in get_resource_filename """Retrieve a PEP 302 "importer" for the given path item File "build/bdist.macosx-10.9-intel/egg/pkg_resources.py", line 1629, in _extract_resource from pkgutil import get_importer, ImpImporter File "build/bdist.macosx-10.9-intel/egg/pkg_resources.py", line 990, in get_cache_path AttributeError: ResourceManager instance has no attribute '_warn_unsafe_extraction' Process finished with exit code 1
原文链接：http://blog.yourtion.com/solve-warn_unsafe_extraction.html
