解决办法：
$ sudo chown -R $USER /usr/local/lib/python2.7 $ pip install mock --ignore-installed six --user
问题：安装mock时报错：
(venv)➜ test git:(master) pip install mock Requirement already satisfied: mock in /Library/Python/2.7/site-packages Collecting six>=1.9 (from mock) Using cached six-1.11.0-py2.py3-none-any.whl Requirement already satisfied: funcsigs>=1; python_version < "3.3" in /Library/Python/2.7/site-packages (from mock) Requirement already satisfied: pbr>=0.11 in /Library/Python/2.7/site-packages (from mock) Installing collected packages: six Found existing installation: six 1.4.1 DEPRECATION: Uninstalling a distutils installed project (six) 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 six-1.4.1: Exception: Traceback (most recent call last): File "/Library/Python/2.7/site-packages/pip/basecommand.py", line 215, in main status = self.run(options, args) File "/Library/Python/2.7/site-packages/pip/commands/install.py", line 342, in run prefix=options.prefix_path, File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 778, in install requirement.uninstall(auto_confirm=True) File "/Library/Python/2.7/site-packages/pip/req/req_install.py", line 754, in uninstall paths_to_remove.remove(auto_confirm) File "/Library/Python/2.7/site-packages/pip/req/req_uninstall.py", line 115, in remove renames(path, new_path) File "/Library/Python/2.7/site-packages/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: '/var/folders/pk/7yrbjrzx0j76mvd9s49djz_40000gn/T/pip-ogx4a9-uninstall/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/six-1.4.1-py2.7.egg-info'
参考：https://github.com/donnemartin/haxor-news/issues/54
pip install --ignore-installed six
又报错：
(venv)➜ test git:(master) pip install mock --ignore-installed six Collecting mock Using cached mock-2.0.0-py2.py3-none-any.whl Collecting six Using cached six-1.11.0-py2.py3-none-any.whl Collecting funcsigs>=1; python_version < "3.3" (from mock) Using cached funcsigs-1.0.2-py2.py3-none-any.whl Collecting pbr>=0.11 (from mock) Using cached pbr-3.1.1-py2.py3-none-any.whl Installing collected packages: six, funcsigs, pbr, mock Exception: Traceback (most recent call last): File "/Library/Python/2.7/site-packages/pip/basecommand.py", line 215, in main status = self.run(options, args) File "/Library/Python/2.7/site-packages/pip/commands/install.py", line 342, in run prefix=options.prefix_path, File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 784, in install **kwargs File "/Library/Python/2.7/site-packages/pip/req/req_install.py", line 851, in install self.move_wheel_files(self.source_dir, root=root, prefix=prefix) File "/Library/Python/2.7/site-packages/pip/req/req_install.py", line 1064, in move_wheel_files isolated=self.isolated, File "/Library/Python/2.7/site-packages/pip/wheel.py", line 345, in move_wheel_files clobber(source, lib_dir, True) File "/Library/Python/2.7/site-packages/pip/wheel.py", line 323, in clobber shutil.copyfile(srcfile, destfile) File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 83, in copyfile with open(dst, 'wb') as fdst: IOError: [Errno 13] Permission denied: '/Library/Python/2.7/site-packages/six.py'
参考：https://github.com/pypa/pip/issues/4186
pip install mock --ignore-installed six --user
又遇到错误：
Collecting mock Using cached mock-2.0.0-py2.py3-none-any.whl Collecting six Using cached six-1.11.0-py2.py3-none-any.whl Collecting funcsigs>=1; python_version < "3.3" (from mock) Using cached funcsigs-1.0.2-py2.py3-none-any.whl Collecting pbr>=0.11 (from mock) Using cached pbr-3.1.1-py2.py3-none-any.whl Installing collected packages: six, funcsigs, pbr, mock Exception: Traceback (most recent call last): File "/Library/Python/2.7/site-packages/pip/basecommand.py", line 215, in main status = self.run(options, args) File "/Library/Python/2.7/site-packages/pip/commands/install.py", line 342, in run prefix=options.prefix_path, File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 784, in install **kwargs File "/Library/Python/2.7/site-packages/pip/req/req_install.py", line 851, in install self.move_wheel_files(self.source_dir, root=root, prefix=prefix) File "/Library/Python/2.7/site-packages/pip/req/req_install.py", line 1064, in move_wheel_files isolated=self.isolated, File "/Library/Python/2.7/site-packages/pip/wheel.py", line 492, in move_wheel_files maker.make_multiple(['%s = %s' % kv for kv in console.items()]) File "/Library/Python/2.7/site-packages/pip/_vendor/distlib/scripts.py", line 383, in make_multiple filenames.extend(self.make(specification, options)) File "/Library/Python/2.7/site-packages/pip/_vendor/distlib/scripts.py", line 372, in make self._make_script(entry, filenames, options=options) File "/Library/Python/2.7/site-packages/pip/_vendor/distlib/scripts.py", line 276, in _make_script self._write_script(scriptnames, shebang, script, filenames, ext) File "/Library/Python/2.7/site-packages/pip/_vendor/distlib/scripts.py", line 250, in _write_script self._fileop.write_binary_file(outname, script_bytes) File "/Library/Python/2.7/site-packages/pip/_vendor/distlib/util.py", line 407, in write_binary_file with open(path, 'wb') as f: IOError: [Errno 13] Permission denied: '/usr/local/bin/pbr'
最后：
(venv)➜ test git:(master) pip install mock --ignore-installed six --user Collecting mock Using cached mock-2.0.0-py2.py3-none-any.whl Collecting six Using cached six-1.11.0-py2.py3-none-any.whl Collecting funcsigs>=1; python_version < "3.3" (from mock) Using cached funcsigs-1.0.2-py2.py3-none-any.whl Collecting pbr>=0.11 (from mock) Using cached pbr-3.1.1-py2.py3-none-any.whl Installing collected packages: six, funcsigs, pbr, mock Successfully installed funcsigs-1.0.2 mock-2.0.0 pbr-3.1.1 six-1.11.0