python实现基本进制转换的方法

# Parsing string with base into a number is easy
num = int(str, radix)
# We have to write our own function for outputting to string with arbitrary base
def itoa(num, radix):
 result = "" 
 while num > 0:
  result = "0123456789abcdefghijklmnopqrstuvwxyz"[num % radix] + result
  num /= radix
 return result