title: check in python if a conda package exist
body: <p>For a given python version, platform, is there a way
  to check if a package is available on conda (using python),
  other than scraping conda website ?</p>
  
  <p>The goal is to check using python code, and not via scraping or
  command line scraping.</p>
  
  <p>Example URL :
  <a href="https://anaconda.org/conda-forge/xlwt/files" rel="nofollow noreferrer">https://anaconda.org/conda-forge/xlwt/files</a></p>