title: Are there naming conventions for pip requirements files?
body: <p>Are there conventions for storing multiple <code>requirements.txt</code> files in a Python code repository. For example, one file for simply running the program, another for day-to-day development, another for making a Windows build.</p>
  
  <ul>
  <li>Some repositories contain two files, <code>requirements.txt</code> and <code>requirements_dev.txt</code>, or <code>requirements.txt</code> and <code>requirements_win.txt</code> - this seems pretty ad-hoc.</li>
  <li>I have others with a <code>requires</code> subfolder. But I'm not sure what the meaning of <code>requires/requirements.txt</code> is in this context -- running the application, or for development?</li>
  <li>There is no mention of storing multiple requirements files in <a href="https://python-guide-pt-br.readthedocs.io/en/latest/writing/structure/" rel="nofollow noreferrer">Structuring your project</a> (Hitchhiker's guide to Python) or <a href="https://pip.pypa.io/en/stable/reference/pip_install/" rel="nofollow noreferrer">pip install</a> (pip documentation).</li>
  </ul>