pipをインストールできません

前提・実現したいこと

pipをインストールしたく、下記のコードを入力したところ
pip freeze --local | grep -v '^-e' | cut -d = -f 1 | xargs pip install -U --user
次のようなエラーメッセージが表示されました。

発生している問題・エラーメッセージ

ERROR:
1     command: /usr/bin/python -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/private/var/folders/yh/n5r2vrzx40z52fgvq02vf9bc0000gn/T/pip-install-kCPVgf/xattr/setup.py'"'"'; __file__='"'"'/private/var/folders/yh/n5r2vrzx40z52fgvq02vf9bc0000gn/T/pip-install-kCPVgf/xattr/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /private/var/folders/yh/n5r2vrzx40z52fgvq02vf9bc0000gn/T/pip-install-kCPVgf/xattr/pip-egg-info
2         cwd: /private/var/folders/yh/n5r2vrzx40z52fgvq02vf9bc0000gn/T/pip-install-kCPVgf/xattr/
3    Complete output (25 lines):
4    Download error on https://pypi.python.org/simple/cffi/: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:590) -- Some packages may not be found!
5    Couldn't find index page for 'cffi' (maybe misspelled?)
6    Download error on https://pypi.python.org/simple/: [SSL: TLSV1_ALERT_PROTOCOL_VERSION] tlsv1 alert protocol version (_ssl.c:590) -- Some packages may not be found!
7    No local packages or download links found for cffi>=1.0.0
8    Traceback (most recent call last):
9      File "<string>", line 1, in <module>
10      File "/private/var/folders/yh/n5r2vrzx40z52fgvq02vf9bc0000gn/T/pip-install-kCPVgf/xattr/setup.py", line 56, in <module>
11        zip_safe=False,
12      File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/distutils/core.py", line 111, in setup
13        _setup_distribution = dist = klass(attrs)
14      File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/setuptools/dist.py", line 268, in __init__
15        self.fetch_build_eggs(attrs['setup_requires'])
16      File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/setuptools/dist.py", line 313, in fetch_build_eggs
17        replace_conflicting=True,
18      File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources/__init__.py", line 843, in resolve
19        dist = best[req.key] = env.best_match(req, ws, installer)
20      File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources/__init__.py", line 1088, in best_match
21        return self.obtain(req, installer)
22      File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources/__init__.py", line 1100, in obtain
23        return installer(requirement)
24      File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/setuptools/dist.py", line 380, in fetch_build_egg
25        return cmd.easy_install(req)
26      File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/setuptools/command/easy_install.py", line 632, in easy_install
27        raise DistutilsError(msg)
28    distutils.errors.DistutilsError: Could not find suitable distribution for Requirement.parse('cffi>=1.0.0')
29    ----------------------------------------
30ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
31
32### 該当のソースコード
33
34pythonを用いてます
35