title: pkg_resources.ResolutionError not found
body: <p>I tried install a package in python3 called Spexxy, using this:</p>
  
  <pre><code>pip3 install -r requirements.txt
  </code></pre>
  
  <pre><code>python3 setup.py install
  </code></pre>
  
  <p>Using iPython in the shell, I can well import the package with <code>import spexxy</code> but when I try to use anything from the package, first I have to use an exclamation point before the command like for example <code>!spexxytools grid create</code>, otherwise I have the error:</p>
  
  <pre><code>File "&lt;ipython-input-3-b744a07ba8b3&gt;", line 1
      spexxytools grid create --from-filename "lte(?P&lt;Teff&gt;\d{5})-(?P&lt;logg&gt;\d\.\d\d)(?P&lt;FeH&gt;[+-]\d\.\d)(\.Alpha=(?P&lt;Alpha&gt;[+-]\d\.\d\d))?\.PHOENIX"
                     ^
  SyntaxError: invalid syntax
  </code></pre>
  
  <p>But even when using the exclamation point, I now have the error:</p>
  
  <pre><code>  File "/home/geoffrey/.local/bin/spexxy", line 4, in &lt;module&gt;
      __import__('pkg_resources').run_script('spexxy==2.3', 'spexxy')
    File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 658, in run_script
      self.require(requires)[0].run_script(script_name, ns)
    File "/usr/lib/python3/dist-packages/pkg_resources/__init__.py", line 1429, in run_script
      .format(**locals()),
  pkg_resources.ResolutionError: Script 'scripts/spexxy' not found in metadata at '/home/geoffrey/.local/lib/python3.6/site-packages/spexxy-2.3.dist-info'
  
  </code></pre>
  
  <p>Can you help me find what's wrong ?</p>