使用 pip 安装第三方库时，报错：

You are using pip version 9.0.3, however version 10.0.1 is available.

You should consider upgrading via the 'pip install --upgrade pip' command.

　　使用：pip install --upgrade pip 命令时，出现异常：

Installing collected packages: pip

  Found existing installation: pip 9.0.3

    Uninstalling pip-9.0.3:

Exception:

Traceback (most recent call last):

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/shutil.py", line 544, in move

    os.rename(src, real_dst)

PermissionError: [Errno 13] Permission denied: '/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pip-9.0.3.dist-info/DESCRIPTION.rst' -> '/var/folders/jw/d3_slty13w37lv03q_lly96m0000gn/T/pip-q73ghl27-uninstall/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pip-9.0.3.dist-info/DESCRIPTION.rst'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pip/basecommand.py", line 215, in main

    status = self.run(options, args)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pip/commands/install.py", line 342, in run

    prefix=options.prefix_path,

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pip/req/req_set.py", line 778, in install

    requirement.uninstall(auto_confirm=True)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pip/req/req_install.py", line 754, in uninstall

    paths_to_remove.remove(auto_confirm)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pip/req/req_uninstall.py", line 115, in remove

    renames(path, new_path)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pip/utils/__init__.py", line 267, in renames

    shutil.move(old, new)

  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/shutil.py", line 559, in move

    os.unlink(src)

PermissionError: [Errno 13] Permission denied: '/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/pip-9.0.3.dist-info/DESCRIPTION.rst'

You are using pip version 9.0.3, however version 10.0.1 is available.

You should consider upgrading via the 'pip install --upgrade pip' command.

　　解决方案：

　　使用：

sudo  pip install --upgrade pip