pipがインストールできない

https://qiita.com/suzuki_y/items/3261ffa9b67410803443
こちらの記事に従って、

python get-pip.py

を用いたところ以下のようなエラーが生じました。

Exception:
Traceback (most recent call last):
  File "/var/folders/mw/mgnjhp791wlb21w8p893yys80000gn/T/tmpiHZyvz/pip.zip/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/var/folders/mw/mgnjhp791wlb21w8p893yys80000gn/T/tmpiHZyvz/pip.zip/pip/commands/install.py", line 342, in run
    prefix=options.prefix_path,
  File "/var/folders/mw/mgnjhp791wlb21w8p893yys80000gn/T/tmpiHZyvz/pip.zip/pip/req/req_set.py", line 784, in install
    **kwargs
  File "/var/folders/mw/mgnjhp791wlb21w8p893yys80000gn/T/tmpiHZyvz/pip.zip/pip/req/req_install.py", line 851, in install
    self.move_wheel_files(self.source_dir, root=root, prefix=prefix)
  File "/var/folders/mw/mgnjhp791wlb21w8p893yys80000gn/T/tmpiHZyvz/pip.zip/pip/req/req_install.py", line 1064, in move_wheel_files
    isolated=self.isolated,
  File "/var/folders/mw/mgnjhp791wlb21w8p893yys80000gn/T/tmpiHZyvz/pip.zip/pip/wheel.py", line 345, in move_wheel_files
    clobber(source, lib_dir, True)
  File "/var/folders/mw/mgnjhp791wlb21w8p893yys80000gn/T/tmpiHZyvz/pip.zip/pip/wheel.py", line 287, in clobber
    ensure_dir(dest)  # common for the 'include' path
  File "/var/folders/mw/mgnjhp791wlb21w8p893yys80000gn/T/tmpiHZyvz/pip.zip/pip/utils/__init__.py", line 83, in ensure_dir
    os.makedirs(path)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.py", line 150, in makedirs
    makedirs(head, mode)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.py", line 150, in makedirs
    makedirs(head, mode)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.py", line 157, in makedirs
    mkdir(name, mode)
OSError: [Errno 13] Permission denied: '/Library/Python'

どのようにすればエラーを解決し、pipを正常にインストールすることができるでしょうか？