title: Unable to install python3 package via pip
body: <p>I am currently moving from Python 2 to Python 3, and I found that one of the packages that I use is currently in Python3 only through a <a href="https://github.com/ptone/pyosc/pull/7" rel="nofollow noreferrer">pull-request</a>.</p>
  <p>So, I decided to checkout the repository, and checkout the pull-request. I checked and this pull-request only updates a .py file which contains all the coding for the package.</p>
  <p>Then, I tried to install the package (being on my computer locally) with pip:</p>
  <pre><code>python .\Scripts\pip3.exe install --upgrade --no-index --find-links=. C:\Users\DASTe\PycharmProjects\pyosc
  </code></pre>
  <p>However, I'm getting the following error:</p>
  <pre><code>Looking in links: .
  Processing c:\users\date\pycharmprojects\pyosc
      ERROR: Command errored out with exit status 1:
       command: 'C:\Users\DASTe\PycharmProjects\DASTeNer\server_py3\python_win32\python.exe' -c 'import sys, setuptools, tokenize; sys.argv[0] = '&quot;'&quot;'C:\\Users\\DASTe\\AppData\\Local\\Temp\\pip-req-build-xhcdcl8u\\setup.py'&quot;'&quot;'; __file__='&quot;'&quot;'C:\\Users\\DASTe\\AppData\\Local\\Temp\\pip-req-build-xhcdcl8u\\setup.py'&quot;'&quot;';f=getattr(tokenize, '&quot;'&quot;'open'&quot;'&quot;', open)(__file__);code=f.read().replace('&quot;'&quot;'\r\n'&quot;'&quot;', '&quot;'&quot;'\n'&quot;'&quot;');f.close();exec(compile(code, __file__, '&quot;'&quot;'exec'&quot;'&quot;'))' egg_info --egg-base pip-egg-info
           cwd: C:\Users\DASTe\AppData\Local\Temp\pip-req-build-xhcdcl8u\
      Complete output (5 lines):
      Traceback (most recent call last):
        File &quot;&lt;string&gt;&quot;, line 1, in &lt;module&gt;
        File &quot;C:\Users\DASTe\AppData\Local\Temp\pip-req-build-xhcdcl8u\setup.py&quot;, line 5, in &lt;module&gt;
          import OSC
      ModuleNotFoundError: No module named 'OSC'
      ----------------------------------------
  ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.
  </code></pre>
  <p>This happens in the <code>setup.py</code> file from the package. I have googled, and it appears that in Python 3, the relative imports are done using <code>from . import OSC</code>. However, when I switch that line from <code>setup.py</code>, I get another error:</p>
  <pre><code>File &quot;C:\Users\DASTe\AppData\Local\Temp\pip-req-build-7g6v4fwu\setup.py&quot;, line 5, in &lt;module&gt;
          from . import OSC
      ImportError: cannot import name 'OSC' from '__main__' (C:\Users\DASTe\AppData\Local\Temp\pip-req-build-7g6v4fwu\setup.py)
  </code></pre>
  <p>Any clue, please?</p>
  <p>Many thanks!</p>