title: How to load multiple yaml files with PyYAML?
body: <p>I have a list of yaml files I want to load and return their contents in one single dictionary.</p>
  <p>The easiest way would be to iterate through the filenames and load individually with <code>safe_load</code>, and then merge the resulting dictionaries.
  However,I was wondering if the python yaml library has already a functionality for that. I saw there are methods <code>load_all</code> and <code>safe_load_all</code>, but they still take only one stream, so I'm not sure if or how I can use those.</p>