The file menu in Editor windows could benefit from a
"reload" function that re-reads the file from disc and
loads it into the editor, replacing what's currently in
the editor.  That's useful for those of us who like to
edit with Emacs in another window while running the
code under Idle.  To get really fancy, it might be cool
to optionally display a diff between the in-editor
version and the on-disk version allowing merging
changes, but that's maybe over the top.

Other editors usually do have commands like this,
e.g.M-x Revert-file in Emacs or ":e!" in vi.