Python - Binary Converter

Description: Binary converter with Python.

#!/usr/bin/python

# http://kuntoaji.blogspot.com

def dec2bin(dec):
 bin = ''
 if dec < 0:
  raise ValueError, 'Must be a positive value'
 elif dec == 0:
  return '0'
 else:
  while dec > 0:
   bin = str(dec % 2) + bin
   dec = dec >> 1
  return bin

def bin2dec(bin):
 dec = 0
 bin_val = 0
 str_len = -1
 len_str = len(bin)
 len_str -= 1
 i = 0
 j = len_str

 while (i <= len_str):
  bin_val = bin[i]
  bin_val = int(bin_val)

  if ((bin_val == 1) or (bin_val == 0)):
   dec = dec + ((2**j)*bin_val)
  else:
   dec = 'not binary'
   break

  i += 1
  j -= 1
 return dec

if __name__ == '__main__':
 print '--------------------------'
 print '[+] Binary Converter   [+]'
 print '--------------------------\n\n'
 print 'Testing...\n'
 print 'Decimal to Binary'
 print '20: ', dec2bin(20)
 print '100: ', dec2bin(100)
 print '192: ', dec2bin(192)
 print '168: ', dec2bin(168)
 print '\nBinary to Decimal'
 print '100: ', bin2dec('100')
 print '123: ', bin2dec('123')
 print '1111: ', bin2dec('1111')

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