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Suggestion: Add an option to bin/hex/oct functions to format binary output with a minimum fixed width, including leading zeros. Also might be useful for hex and oct.
Currently, bin(18) produces '0b10010'
with this change, something like bin(18, foo=8) would produce '0b00010010'
Examples of people wanting this:
http://stackoverflow.com/questions/3258330/converting-from-hex-to-binary-without-losing-leading-0s-python
http://stackoverflow.com/questions/1002116/can-bin-be-overloaded-like-oct-and-hex-in-python-2-6
http://stackoverflow.com/a/1425558/125507
https://www.linuxquestions.org/questions/programming-9/in-python-printing-leading-zero-for-hex-numbers-0-through-f-719426/ 

-1. str.format already does this quite effectively; I don't see a real need to complicate the bin, hex and oct signatures.
>>> '{:016b}'.format(324)
'0000000101000100'
>>> '{:016o}'.format(324)
'0000000000000504'
>>> '{:016x}'.format(324)
'0000000000000144'

I'm rejecting this: the functionality is already there in str.format, and there's little to be gained by adding another way to do it.

I agree with Mark.
This can also be done slightly more efficiently with plain format():
>>> format(324, "016b")
'0000000101000100'
>>> format(324, "016o")
'0000000000000504'
>>> format(324, "016x")
'0000000000000144'
And with either format() or str.format(), you can add the appropriate prefix:
>>> format(324, "#016b")
'0b00000101000100'
>>> format(324, "#016o")
'0o00000000000504'
>>> format(324, "#016x")
'0x00000000000144'
I don't see ever adding all of the possible options to bin(), etc.