get the number of one bits in a number (python)

number_of_one_bits.py

def num_of_one_bits(num):
  total = 0
  bits = ""
  while(num > 0):
    bits += str(num&1)
    total += num&1
    num>>=1
  return total,bits

number = input("Please give an integer: ")
total,bits = num_of_one_bits(number)
print "Number of one bits: " + str(total)
print "bit representation: " + bits[::-1]