num2bin.py

a = 0xdeadbeef

print bin(a)

def gbits(a):
  while a:
    yield a & 0x1
    a >>= 1
    
print tuple(bit for bit in gbits(0xdeadbeef))

_, bits = reduce(
            lambda (a, bits), bitnum: (a >> 1, bits + (a & 0x1,)),
            xrange(a.bit_length()),
            (a, ())
          )
print bits


print tuple(
        (a >> bit) & 0x1
          for bit in xrange(a.bit_length())
      )