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python -m pip install --upgrade pip

问题：

Collecting pip   Using cached pip-9.0.1-py2.py3-none-any.whl Installing collected packages: pip   Found existing installation: pip 8.1.2     Uninstalling pip-8.1.2:       Successfully uninstalled pip-8.1.2   Rolling back uninstall of pip Exception: Traceback (most recent call last):   File "D:\python3.5.2\lib\site-packages\pip-8.1.2-py3.5.egg\pip\basecommand.py", line 215, in main     status = self.run(options, args)   File "D:\python3.5.2\lib\site-packages\pip-8.1.2-py3.5.egg\pip\commands\install.py", line 317, in run     prefix=options.prefix_path,   File "D:\python3.5.2\lib\site-packages\pip-8.1.2-py3.5.egg\pip\req\req_set.py", line 742, in install     **kwargs   File "D:\python3.5.2\lib\site-packages\pip-8.1.2-py3.5.egg\pip\req\req_install.py", line 831, in install     self.move_wheel_files(self.source_dir, root=root, prefix=prefix)   File "D:\python3.5.2\lib\site-packages\pip-8.1.2-py3.5.egg\pip\req\req_install.py", line 1032, in move_wheel_files     isolated=self.isolated,   File "D:\python3.5.2\lib\site-packages\pip-8.1.2-py3.5.egg\pip\wheel.py", line 463, in move_wheel_files     generated.extend(maker.make(spec))   File "D:\python3.5.2\lib\site-packages\pip-8.1.2-py3.5.egg\pip\_vendor\distlib\scripts.py", line 372, in make     self._make_script(entry, filenames, options=options)   File "D:\python3.5.2\lib\site-packages\pip-8.1.2-py3.5.egg\pip\_vendor\distlib\scripts.py", line 276, in _make_script     self._write_script(scriptnames, shebang, script, filenames, ext)   File "D:\python3.5.2\lib\site-packages\pip-8.1.2-py3.5.egg\pip\_vendor\distlib\scripts.py", line 212, in _write_script     launcher = self._get_launcher('t')   File "D:\python3.5.2\lib\site-packages\pip-8.1.2-py3.5.egg\pip\_vendor\distlib\scripts.py", line 351, in _get_launcher     result = finder(distlib_package).find(name).bytes AttributeError: 'NoneType' object has no attribute 'bytes' You are using pip version 8.1.2, however version 9.0.1 is available. You should consider upgrading via the 'python -m pip install --upgrade pip' command.

You are using pip version 8.1.2, however version 9.0.1 is available.

You should consider upgrading via the 'python -m pip install --upgrade pip' command. 解决方法：

python -m pip install -U --force-reinstall pip

Collecting pip

  Using cached pip-9.0.1-py2.py3-none-any.whl Installing collected packages: pip   Found existing installation: pip 9.0.1     Uninstalling pip-9.0.1:       Successfully uninstalled pip-9.0.1 Successfully installed pip-9.0.1

参考https://github.com/pypa/pip/issues/2669

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