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Go for it.  It has a better chance at acceptance if it sticks to 
inquiry methods (e.g., tie it into adding a new mutable bit 
array type too, and the odds plummet).  Note that "bitwid" is 
an egregiously un-Pythonic abbreviation -- are you trying to 
save "th" at the end?  If so, don't.  Note the same methods 
will have to be added to ints too -- Python's trying to eradicate 
the user-visible differences between ints and longs, so adding 
methods unique to one of those types would llikely be 
rejected for that reason alone.

Don't forget popcount (number of 1 bits set); there and 
elsewhere, what to do about negative inputs will be 
contentious.  Following GMP's lead is better than making 
stuff up then.