title: pip install "Invalid requirement: 'numpy-1.13.1+mkl-cp36-cp36m-win_amd64'"
body: <p>I am on a windows 10 machine and I can't seem to get it to install numpy+mkl. I have no clue what is going on or why it is doing this. It says the following errors occurred in the most recent Traceback:</p>
  
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  <pre class="snippet-code-css lang-css prettyprint-override"><code>File "..\appdata\local\programs\python\python36-32\lib\site-packages\pip\_vendor\packaging\requirements.py", line 92, in __init__
      req = REQUIREMENT.parseString(requirement_string)"
  File "..\appdata\local\programs\python\python36-32\lib\site-packages\pip\_vendor\pyparsing.py", line 1617, in parseString
      raise exc"
    File "..\appdata\local\programs\python\python36-32\lib\site-packages\pip\_vendor\pyparsing.py", line 1607, in parseString
      loc, tokens = self._parse( instring, 0 )
    File "..\appdata\local\programs\python\python36-32\lib\site-packages\pip\_vendor\pyparsing.py", line 1379, in _parseNoCache
      loc,tokens = self.parseImpl( instring, preloc, doActions )
    File "..\appdata\local\programs\python\python36-32\lib\site-packages\pip\_vendor\pyparsing.py", line 3376, in parseImpl
      loc, exprtokens = e._parse( instring, loc, doActions )
    File "..\appdata\local\programs\python\python36-32\lib\site-packages\pip\_vendor\pyparsing.py", line 1383, in _parseNoCache
      loc,tokens = self.parseImpl( instring, preloc, doActions )
    File "..\appdata\local\programs\python\python36-32\lib\site-packages\pip\_vendor\pyparsing.py", line 3164, in parseImpl
      raise ParseException(instring, loc, self.errmsg, self)
  pip._vendor.pyparsing.ParseException: Expected stringEnd (at char 12), (line:1, col:13)
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "..\appdata\local\programs\python\python36-32\lib\site-packages\pip\req\req_install.py", line 82, in __init__
      req = Requirement(req)
    File "..\appdata\local\programs\python\python36-32\lib\site-packages\pip\_vendor\packaging\requirements.py", line 96, in __init__
      requirement_string[e.loc:e.loc + 8]))
  pip._vendor.packaging.requirements.InvalidRequirement: Invalid requirement, parse error at "'+mkl-cp3</code></pre>
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  </div>
  </p>
  
  <p>I've been sitting for hours trying to figure out what this means. But it is alien to me. I tried to update it, but it says it is already up to date. I've tried using the 32bit wheel it gives me the same thing. What should I do?</p>