python 2.7 - Pip won't install anything -

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i upgraded windows machine new macbook pro. currently, trying used new development environment. problem whenever try pip install prompted following error:

exception: traceback (most recent call last):   file "/library/python/2.7/site-packages/pip-8.1.1-py2.7.egg/pip/basecommand.py", line 209, in main     status = self.run(options, args)   file "/library/python/2.7/site-packages/pip-8.1.1-py2.7.egg/pip/commands/install.py", line 317, in run     prefix=options.prefix_path,   file "/library/python/2.7/site-packages/pip-8.1.1-py2.7.egg/pip/req/req_set.py", line 732, in install     **kwargs   file "/library/python/2.7/site-packages/pip-8.1.1-py2.7.egg/pip/req/req_install.py", line 835, in install     self.move_wheel_files(self.source_dir, root=root, prefix=prefix)   file "/library/python/2.7/site-packages/pip-8.1.1-py2.7.egg/pip/req/req_install.py", line 1030, in move_wheel_files     isolated=self.isolated,   file "/library/python/2.7/site-packages/pip-8.1.1-py2.7.egg/pip/wheel.py", line 344, in move_wheel_files     clobber(source, lib_dir, true)   file "/library/python/2.7/site-packages/pip-8.1.1-py2.7.egg/pip/wheel.py", line 322, in clobber     shutil.copyfile(srcfile, destfile)   file "/system/library/frameworks/python.framework/versions/2.7/lib/python2.7/shutil.py", line 83, in copyfile     open(dst, 'wb') fdst: ioerror: [errno 13] permission denied: '/library/python/2.7/site-packages/virtualenv.py'

thanks in advance!


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