title: cant use pip3, gives me errors
body: <p>hey i have 2 versions of python on my computer(2.7 and 3.5), im trying to use pip3, but it shows me this error message</p>
  
  <pre><code>Traceback (most recent call last):
    File "/usr/local/bin/pip3", line 5, in &lt;module&gt;
      from pkg_resources import load_entry_point
    File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2927, in &lt;module&gt;
      @_call_aside
    File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2913, in _call_aside
      f(*args, **kwargs)
    File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 2940, in _initialize_master_working_set
      working_set = WorkingSet._build_master()
    File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 637, in _build_master
      return cls._build_from_requirements(__requires__)
    File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 650, in _build_from_requirements
      dists = ws.resolve(reqs, Environment())
    File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 829, in resolve
      raise DistributionNotFound(req, requirers)
  pkg_resources.DistributionNotFound: The 'pip==18.1' distribution was not found and is required by the application
  </code></pre>
  
  <p>I know pip3 should work with python3 but here it shows in the error python2.7 so that's probably the error but how do i fix that to point my python 3.5.2.</p>
  
  <p>thank you very much!</p>