main.py

import string, sexuaddr
TOX_ADDR="5A528ABA260B66096AAD1355CA6918D41158A7B7D0134684DF55722D25194369D4D37F7B7B77"

if (all(c in string.hexdigits for c in TOX_ADDR)):
  print sexuaddr.tox_to_sexu(TOX_ADDR)
else:
	print "Invalid Tox Addr"

sexuaddr.py

##IMPORTING
import math
try:
  import Crypto.Hash.SHA256 as SHA256
  import Crypto.Hash.RIPEMD160 as RIPEMD160
  have_crypto = True
except ImportError:
  have_crypto = False

##BASE58
__b58chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
__b58base = len(__b58chars)
def b58encode(v):
  long_value = 0L
  for (i, c) in enumerate(v[::-1]):
    long_value += ord(c) << (8*i)

  result = ''
  while long_value >= __b58base:
    div, mod = divmod(long_value, __b58base)
    result = __b58chars[mod] + result
    long_value = div
  result = __b58chars[long_value] + result
  nPad = 0
  for c in v:
    if c == '\0': nPad += 1
    else: break

  return (__b58chars[0]*nPad) + result

def b58decode(v, length):
  """ decode v into a string of len bytes
  """
  long_value = 0L
  for (i, c) in enumerate(v[::-1]):
    long_value += __b58chars.find(c) * (__b58base**i)

  result = ''
  while long_value >= 256:
    div, mod = divmod(long_value, 256)
    result = chr(mod) + result
    long_value = div
  result = chr(long_value) + result

  nPad = 0
  for c in v:
    if c == __b58chars[0]: nPad += 1
    else: break

  result = chr(0)*nPad + result
  if length is not None and len(result) != length:
    return None

  return result
## CONVERTING ADDR TO SEXU FORMAT
def tox_to_sexu(addr):
  a1="\x539"+RIPEMD160.new(SHA256.new(addr).digest()).digest()
  a2=SHA256.new(SHA256.new(a1).digest()).digest()
  taddr=a1+a2[0:4]
  return b58encode(taddr)