pip升级报错解决办法
pip升级频率很高，不升级经常会遇到这样哪样的异常。有一种异常，我相信你一定遇到，话不多说，上错误信息。
1.错误现象
(paddle2) D:\github\PGL>python.exe -m pip install --upgrade pip
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Collecting pip
Using cached https://pypi.tuna.tsinghua.edu.cn/packages/cb/28/91f26bd088ce8e22169032100d4260614fc3da435025ff389ef1d396a433/pip-20.2.4-py2.py3-none-any.whl (1.5 MB)
Installing collected packages: pip
Attempting uninstall: pip
  Found existing installation: pip 20.2.3
  Uninstalling pip-20.2.3:
    Successfully uninstalled pip-20.2.3
Rolling back uninstall of pip
Moving to c:\users\administrator\appdata\roaming\python\python37\scripts\
  from c:\users\administrator\appdata\roaming\python\python37\~cripts
Moving to c:\users\administrator\appdata\roaming\python\python37\site-packages\pip-20.2.3.dist-info\
  from c:\users\administrator\appdata\roaming\python\python37\site-packages\~ip-20.2.3.dist-info
Moving to c:\users\administrator\appdata\roaming\python\python37\site-packages\pip\
  from c:\users\administrator\appdata\roaming\python\python37\site-packages\~ip
ERROR: Exception:
Traceback (most recent call last):
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_internal\cli\base_command.py", line 228, in _main
  status = self.run(options, args)
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_internal\cli\req_command.py", line 182, in wrapper
  return func(self, options, args)
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_internal\commands\install.py", line 406, in run
   pycompile=options.compile,
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_internal\req\__init__.py", line 90, in install_given_reqs
   pycompile=pycompile,
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_internal\req\req_install.py", line 822, in install
   requested=self.user_supplied,
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_internal\operations\install\wheel.py", line 860, in install_wheel
   requested=requested,
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_internal\operations\install\wheel.py", line 762, in _install_wheel
  generated_console_scripts = maker.make_multiple(scripts_to_generate)
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_vendor\distlib\scripts.py", line 418, in make_multiple
  filenames.extend(self.make(specification, options))
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_internal\operations\install\wheel.py", line 498, in make
  return super(PipScriptMaker, self).make(specification, options)
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_vendor\distlib\scripts.py", line 407, in make
  self._make_script(entry, filenames, options=options)
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_vendor\distlib\scripts.py", line 307, in _make_script
  self._write_script(scriptnames, shebang, script, filenames, ext)
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_vendor\distlib\scripts.py", line 242, in _write_script
  launcher = self._get_launcher('t')
File "C:\Users\Administrator\AppData\Roaming\Python\Python37\site-packages\pip\_vendor\distlib\scripts.py", line 386, in _get_launcher
  raise ValueError(msg)
ValueError: Unable to find resource t64.exe in package pip._vendor.distlib
WARNING: You are using pip version 20.2.3; however, version 20.2.4 is available.
You should consider upgrading via the 'd:\Miniconda3\envs\paddle2\python.exe -m pip install --upgrade pip' command.
​
2.解决办法
如上图所示，你用pip install --upgrade pip 也无济于事。那么怎么处理呢？
2.1卸载 setuptools

python -m pip uninstall pip setuptools

(paddle2) D:\github\PGL> python -m pip uninstall pip setuptools
Found existing installation: pip 20.2.3
Uninstalling pip-20.2.3:
Would remove:
  c:\users\administrator\appdata\roaming\python\python37\scripts\pip.exe
  c:\users\administrator\appdata\roaming\python\python37\scripts\pip3.7.exe
  c:\users\administrator\appdata\roaming\python\python37\scripts\pip3.exe
  c:\users\administrator\appdata\roaming\python\python37\site-packages\pip-20.2.3.dist-info\*
  c:\users\administrator\appdata\roaming\python\python37\site-packages\pip\*
Proceed (y/n)? y
Successfully uninstalled pip-20.2.3
Found existing installation: setuptools 50.3.0.post20201006
Uninstalling setuptools-50.3.0.post20201006:
Would remove:
  d:\miniconda3\envs\paddle2\lib\site-packages\_distutils_hack
  d:\miniconda3\envs\paddle2\lib\site-packages\easy_install.py
  d:\miniconda3\envs\paddle2\lib\site-packages\pkg_resources
  d:\miniconda3\envs\paddle2\lib\site-packages\setuptools
  d:\miniconda3\envs\paddle2\lib\site-packages\setuptools-50.3.0.post20201006-py3.7.egg-info
  d:\miniconda3\envs\paddle2\scripts\easy_install-script.py
  d:\miniconda3\envs\paddle2\scripts\easy_install.exe
Proceed (y/n)? y
Successfully uninstalled setuptools-50.3.0.post20201006
2.2 升级pip

(paddle2) D:\github\PGL> pip3 install --upgrade pip
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Requirement already up-to-date: pip in d:\miniconda3\envs\paddle2\lib\site-packages (20.2.4)
2.3 重新安装 setuptools
可以不需要这一步，不过为了以后万一用到准备。