When playing with the Editline alternative to Readline, I noticed that “global” name completions can include duplicates:

>>> No
None                 NotADirectoryError(  NotImplementedError(
None                 NotImplemented      
>>> None
None None

It completed my line to “None”, but if you hit Tab again, it lists two duplicate options both identical to what I already have. The reason is that “None” is both a reserved keyword, and a member of the builtins module.

My patch avoids adding extra completions if a name has already been added. It also prioritizes the global namespace over builtins, so that say if you alias “int” to a non-callable, it is no longer listed with an opening bracket “(” suffix. Earlier behaviour:

>>> int = 81
>>> in
in     input( int    int(  

Now:

>>> in
in     input( int