convert integer to binary

[Paul Rubin]

ekranawetter at utanet.at (ekranawetter-piber) writes:

> Hi all,
> 
> I couldn't find any function in Python to convert integers to binary
> and vice versa, for example:
> 
> integer 16 = bin 10000, or 
> integer 15 = bin  1111
> bin 11 = integer 3

Note this doesn't bother stripping leading zeros from the result:

def i2b(n):
  hdigits = ('0000','0001','0010','0011','0100','0101','0110','0111',
             '1000','1001','1010','1011','1100','1101','1110','1111')

  a = [hdigits[int(d,16)] for d in hex(n)[2:]]
  return ''.join(a)