I am in AP's camp on the tab issue, but I think we can preserve "tab inserts tab" behavior at the continuation prompt. I don't like "indent at beginning of line." I have rlcompleter enabled in Python 2.6 and i get the following when I press tab:
Python 2.6.6 (r266:84292, Feb 22 2013, 00:00:18)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> <tab>
Display all 173 possibilities? (y or n) y
ArithmeticError( abs( input(
AssertionError( all( int(
AttributeError( and intern(
BaseException( any( is
..
I find this rather useful.
At the ... prompt, however, a tab (or better four spaces) is arguably the right completion at the beginning of the line.