Python int to binary string?

Question

Are there any canned Python methods to convert an Integer (or Long) into a binary string in Python?

There are a myriad of dec2bin() functions out on Google... But I

Answer 1

If you are willing to give up "pure" Python but gain a lot of firepower, there is Sage - example here:

sage: a = 15
sage: a.binary()
'1111'

You'll note that it returns as a string, so to use it as a number you'd want to do something like

sage: eval('0b'+b)
15