title: Python troubleshooting: ImportError: cannot import name 'main'
body: <p>I'm facing a problem with Package Installation, pip. 
  I am using Python 3.6.</p>
  
  <p>When I try to install a package with pip I receive the following message in the cmd.</p>
  
  <pre><code>*C:\Python36\Scripts&gt;pip intstall --user httpie
  Traceback (most recent call last):
    File "c:\python36\lib\runpy.py", line 193, in _run_module_as_main
      "__main__", mod_spec)
    File "c:\python36\lib\runpy.py", line 85, in _run_code
      exec(code, run_globals)
    File "C:\Python36\Scripts\pip.exe\__main__.py", line 5, in &lt;module&gt;
  ImportError: cannot import name 'main'*
  </code></pre>
  
  <p>It happened when I upgraded the pip, before it worked. I tried to uninstal the Python and installed this again but it does not work. I cannot find the solution, any ideas?</p>