title: what does `twine upload dist/*` command do?
body: <p>I apologize in advance since this seems like a basic question...</p>
  
  <p>I am trying to learn using mujoco(<a href="https://github.com/openai/mujoco-py" rel="noreferrer">link here</a>), and inside its python binding Makefile it has:</p>
  
  <pre><code>upload:
     rm -rf dist
     python setup.py sdist
     twine upload dist/*
  </code></pre>
  
  <p>What does <code>twin upload dist/*</code> command do?
  In addition, this asks me for a username and password like this:</p>
  
  <pre><code>Uploading distributions to https://pypi.python.org/pypi
  Enter your username: guest
  Enter your password: 
  Uploading mujoco-py-0.5.7.tar.gz
  HTTPError: 401 Client Error: You must be identified to edit package information for url: https://pypi.python.org/pypi
  Makefile:2: recipe for target 'upload' failed
  </code></pre>
  
  <p>Is this asking for my computer username and password?</p>