title: Converting .pbf file to .osm using pyosmium
body: <p>I have downloaded a rather large file from geofabrik.de and it is in the form of a pbf. I need to convert it into an osm file so I can extract the nodes and edges from the file. I have downloaded the osmium library by using pip install osmium but it just gives me an error</p>
  <p>ModuleNotFoundError: No module named 'osmium'</p>
  <p>Can someone help me with how to use osmium please?</p>