Mac high sierra実行pip時報エラーcommand not foundとImportError:cannot import name ContextualZipFile

1、pipコマンドが見つからない

li:~ S-Li$ pip
-bash: pip: command not found

2、sudo easy_を実行するinstall pipエラー

li:~ S-Li$ sudo easy_install pip
Password:
Traceback (most recent call last):
  File "/usr/bin/easy_install-2.7", line 11, in 
    load_entry_point('setuptools==18.5', 'console_scripts', 'easy_install')()
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 480, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2691, in load_entry_point
    return ep.load()
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2322, in load
    return self.resolve()
  File "/usr/local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2328, in resolve
    module = __import__(self.module_name, fromlist=['__name__'], level=0)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/setuptools/command/easy_install.py", line 46, in 
    from setuptools.archive_util import unpack_archive
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/setuptools/archive_util.py", line 15, in 
    from pkg_resources import ensure_directory, ContextualZipFile
ImportError: cannot import name ContextualZipFile

3、解決方法:
アップグレードpip

li:~ S-Li$ sudo python -m pip install --upgrade --force pip
Password:
The directory '/Users/S-Li/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/S-Li/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 pip
  Downloading https://files.pythonhosted.org/packages/0f/74/ecd13431bcc456ed390b44c8a6e917c1820365cbebcb6a8974d1cd045ab4/pip-10.0.1-py2.py3-none-any.whl (1.3MB)
    100% |████████████████████████████████| 1.3MB 24kB/s 
Installing collected packages: pip
  Found existing installation: pip 9.0.3
    Uninstalling pip-9.0.3:
      Successfully uninstalled pip-9.0.3
Successfully installed pip-10.0.1