Learning Maths

So, while reading the book on Mathematics, I had started to code too. I am starting from simple examples like decimal to binary conversion. I am posting my code here :
This one is for converting a decimal integer to binary:

#!/usr/bin/python
import sys

def dec2bin_int(n):
  arr = []
  print "Decimal no: " , n
  while n > 0:
    arr.append(n % 2)
    n = n / 2
  arr.reverse()
  for i in arr:
    print i,

if __name__ == '__main__':
  dec2bin_int(int(sys.argv[1]))

Another one for converting a floating point number to binary.

#!/usr/bin/python
import sys

def dec2bin_flt(n,limit):
  print "Float no: " , n
  i = 0
  while n > 0:
    i = i+1
    m = 2 * n
    print m.__int__(),
    n = m - m.__int__()
    if i == limit:
      break

if __name__ == '__main__':
  dec2bin_flt(float(sys.argv[1]),int(sys.argv[2]))