概述
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 __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
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