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They potentially could be. However, if the result is something like
>>> if a:
 if b:
 print(a+b)
or worse, with Lucida Sans Unicode, the visual equivalent of
>>> if a:
 if b:
 print(a+b)
then I do not find result very satisfactory. I think moving the prompt to a sidebar, as with line numbers (forthcoming), is a better solution. This will make code look good both in the shell and when copied and pasted elsewhere. I hope to have a patch in a month or two.