the error is:
Exception:
Traceback (most recent call last):
File “c:\programdata\anaconda3\lib\site-packages\pip-18.0-py3.5.egg\pip_internal\basecommand.py”, line 141, in main
status = self.run(options, args)
File “c:\programdata\anaconda3\lib\site-packages\pip-18.0-py3.5.egg\pip_internal\commands\install.py”, line 299, in run
resolver.resolve(requirement_set)
File “c:\programdata\anaconda3\lib\site-packages\pip-18.0-py3.5.egg\pip_internal\resolve.py”, line 102, in resolve
self._resolve_one(requirement_set, req)
File “c:\programdata\anaconda3\lib\site-packages\pip-18.0-py3.5.egg\pip_internal\resolve.py”, line 261, in _resolve_one
check_dist_requires_python(dist)
File “c:\programdata\anaconda3\lib\site-packages\pip-18.0-py3.5.egg\pip_internal\utils\packaging.py”, line 46, in check_dist_requires_python
feed_parser.feed(metadata)
File “C:\ProgramData\Anaconda3\lib\email\feedparser.py”, line 178, in feed
self._input.push(data)
File “C:\ProgramData\Anaconda3\lib\email\feedparser.py”, line 104, in push
self._partial.write(data)
TypeError: string argument expected, got ‘NoneType’
Is the error relative with the package or my python env?