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 
 from Handler.api import UserHandler
 File \"/Users/yourtion/Codes/python/knowme/Handler/api.py\", line 3, in 
 from Model.user import User
 File \"/Users/yourtion/Codes/python/knowme/Model/user.py\", line 2, in 
 from mongoengine import *
 File \"build/bdist.macosx-10.9-intel/egg/mongoengine/__init__.py\", line 1, in 
 File \"build/bdist.macosx-10.9-intel/egg/mongoengine/document.py\", line 4, in 
 File \"/Library/Python/2.7/site-packages/pymongo-2.6.3-py2.7-macosx-10.8-intel.egg/pymongo/__init__.py\", line 80, in 
 File \"/Library/Python/2.7/site-packages/pymongo-2.6.3-py2.7-macosx-10.8-intel.egg/pymongo/connection.py\", line 39, in 
 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 
 File \"/Library/Python/2.7/site-packages/pymongo-2.6.3-py2.7-macosx-10.8-intel.egg/bson/__init__.py\", line 41, in 
 File \"/Library/Python/2.7/site-packages/pymongo-2.6.3-py2.7-macosx-10.8-intel.egg/bson/_cbson.py\", line 7, in 
 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