<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style></head><body><div style="font-family:Helvetica,Arial;font-size:13px; ">I was wondering why Atom doesn't inherit from Entity. It doesn't have children, but it seems like it would be more consistent to have the whole Structure stack inherit from a single point. Is anyone aware of the history there?</div><div style="font-family:Helvetica,Arial;font-size:13px; "><br></div><div style="font-family:Helvetica,Arial;font-size:13px; ">I ask because I'm trying to add type annotations to Bio.PDB, and mypy flagged a number of places where my initial 'Entity' type conflicted with Atoms. We can certainly get around this by accepting either Entity or Atom, but I'm not sure that was intended.</div><div style="font-family:Helvetica,Arial;font-size:13px; "><br></div><div style="font-family:Helvetica,Arial;font-size:13px; ">-Spencer</div><br><div class="gmail_signature" ></div></body></html>