解决安装tensorflow遇到无法卸载numpy 1.8.0rc1的问题

最近在关注 Deep Learning，就在自己的mac上安装google的开源框架Tensorflow

用 sudo pip install -U tensorflow

安装的时候总是遇到下面的问题：

sudo pip install -U tensorflow
Password:
The directory '/Users/jason/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/jason/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting tensorflow
 Downloading tensorflow-1.0.0-cp27-cp27m-macosx_10_11_x86_64.whl (39.3MB)
100% || 39.4MB 32kB/s 
Collecting numpy>=1.11.0 (from tensorflow)
 Downloading numpy-1.12.0-cp27-cp27m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl (4.4MB)
100% || 4.4MB 195kB/s 
Requirement already up-to-date: six>=1.10.0 in /Library/Python/2.7/site-packages/six-1.10.0-py2.7.egg (from tensorflow)
Requirement already up-to-date: mock>=2.0.0 in /Library/Python/2.7/site-packages (from tensorflow)
Requirement already up-to-date: wheel in /Library/Python/2.7/site-packages (from tensorflow)
Requirement already up-to-date: protobuf>=3.1.0 in /Library/Python/2.7/site-packages (from tensorflow)
Requirement already up-to-date: funcsigs>=1; python_version < "3.3" in /Library/Python/2.7/site-packages (from mock>=2.0.0->tensorflow)
Requirement already up-to-date: pbr>=0.11 in /Library/Python/2.7/site-packages (from mock>=2.0.0->tensorflow)
Collecting setuptools (from protobuf>=3.1.0->tensorflow)
 Downloading setuptools-34.3.0-py2.py3-none-any.whl (389kB)
100% || 399kB 1.1MB/s 
Requirement already up-to-date: packaging>=16.8 in /Library/Python/2.7/site-packages (from setuptools->protobuf>=3.1.0->tensorflow)
Requirement already up-to-date: appdirs>=1.4.0 in /Library/Python/2.7/site-packages (from setuptools->protobuf>=3.1.0->tensorflow)
Collecting pyparsing (from packaging>=16.8->setuptools->protobuf>=3.1.0->tensorflow)
 Downloading pyparsing-2.1.10-py2.py3-none-any.whl (56kB)
100% || 61kB 2.5MB/s 
Installing collected packages: numpy, tensorflow, setuptools, pyparsing
 Found existing installation: numpy 1.8.0rc1
DEPRECATION: Uninstalling a distutils installed project (numpy) has been deprecated and will be removed in a future version. This is due to the fact that uninstalling a distutils project will only partially uninstall the project.
Uninstalling numpy-1.8.0rc1:
Exception:
Traceback (most recent call last):
 File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/basecommand.py", line 215, in main
status = self.run(options, args)
 File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/commands/install.py", line 342, in run
prefix=options.prefix_path,
 File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_set.py", line 778, in install
requirement.uninstall(auto_confirm=True)
 File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_install.py", line 754, in uninstall
paths_to_remove.remove(auto_confirm)
 File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_uninstall.py", line 115, in remove
renames(path, new_path)
 File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/utils/__init__.py", line 267, in renames
shutil.move(old, new)
 File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 302, in move
copy2(src, real_dst)
 File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 131, in copy2
copystat(src, dst)
 File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 103, in copystat
os.chflags(dst, st.st_flags)
OSError: [Errno 1] Operation not permitted: '/tmp/pip-aGEdP5-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy-1.8.0rc1-py2.7.egg-info'

后来google到 需要在命令后面加上 Cignore-installed six

就成功了，不过知其然，而不知其所以然

localhost:Desktop jasonlee$ sudo -H pip install tensorflow --ignore-installed six
The directory '/Users/jason/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/jason/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting tensorflow
 Downloading tensorflow-1.0.0-cp27-cp27m-macosx_10_11_x86_64.whl (39.3MB)
100% || 39.4MB 29kB/s 
Collecting six
 Downloading six-1.10.0-py2.py3-none-any.whl
Collecting numpy>=1.11.0 (from tensorflow)
 Downloading numpy-1.12.0-cp27-cp27m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl (4.4MB)
100% || 4.4MB 210kB/s 
Collecting mock>=2.0.0 (from tensorflow)
 Downloading mock-2.0.0-py2.py3-none-any.whl (56kB)
100% || 61kB 556kB/s 
Collecting wheel (from tensorflow)
 Downloading wheel-0.29.0-py2.py3-none-any.whl (66kB)
100% || 71kB 586kB/s 
Collecting protobuf>=3.1.0 (from tensorflow)
 Downloading protobuf-3.2.0-py2.py3-none-any.whl (360kB)
100% || 368kB 922kB/s 
Collecting funcsigs>=1; python_version < "3.3" (from mock>=2.0.0->tensorflow)
 Downloading funcsigs-1.0.2-py2.py3-none-any.whl
Collecting pbr>=0.11 (from mock>=2.0.0->tensorflow)
 Downloading pbr-1.10.0-py2.py3-none-any.whl (96kB)
100% || 102kB 1.1MB/s 
Collecting setuptools (from protobuf>=3.1.0->tensorflow)
 Downloading setuptools-34.3.0-py2.py3-none-any.whl (389kB)
100% || 399kB 657kB/s 
Collecting packaging>=16.8 (from setuptools->protobuf>=3.1.0->tensorflow)
 Downloading packaging-16.8-py2.py3-none-any.whl
Collecting appdirs>=1.4.0 (from setuptools->protobuf>=3.1.0->tensorflow)
 Downloading appdirs-1.4.2-py2.py3-none-any.whl
Collecting pyparsing (from packaging>=16.8->setuptools->protobuf>=3.1.0->tensorflow)
 Downloading pyparsing-2.1.10-py2.py3-none-any.whl (56kB)
100% || 61kB 1.0MB/s 
Installing collected packages: numpy, funcsigs, six, pbr, mock, wheel, pyparsing, packaging, appdirs, setuptools, protobuf, tensorflow
Successfully installed appdirs-1.4.2 funcsigs-1.0.2 mock-2.0.0 numpy-1.12.0 packaging-16.8 pbr-1.10.0 protobuf-3.2.0 pyparsing-2.1.10 setuptools-34.3.0 six-1.10.0 tensorflow-1.0.0 wheel-0.29.0