baseconverter-sctf

import string
digs = string.digits + string.letters

def int2base(x, base):
 if x < 0: sign = -1
 elif x == 0: return digs[0]
 else: sign = 1
 x *= sign
 digits = []
   while x:
     digits.append(digs[x % base])
     x /= base
 if sign < 0:
   digits.append('-')
 digits.reverse()
 return ''.join(digits)