python

#!/usr/bin/env python  
# -*- coding: utf-8 -*-  
# 2/10/16 base trans. wrote by srcdog on 20th, April, 2009  
# ld elements in base 2, 10, 16.  
  
import os,sys  
  
# global definition  
# base = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F]  
base = [str(x) for x in range(10)] + [ chr(x) for x in range(ord('A'),ord('A')+6)]  
  
# bin2dec  
# 二进制 to 十进制: int(str,n=10)   
def bin2dec(string_num):
if string_num == "": 
string_num = "00"
return str(string_num)
else:
return str(int(string_num, 2))  
  
# hex2dec  
# 十六进制 to 十进制  
def hex2dec(string_num):
#print ">>>> :", type(string_num)
raw_input(string_num)
if string_num == "":
string_num = "00"
return string_num
else:
return str(int(string_num.upper(), 16))  
  
# dec2bin  
# 十进制 to 二进制: bin()   
def dec2bin(string_num):  
    num = int(string_num)  
    mid = []  
    while True:  
        if num == 0: break  
        num,rem = divmod(num, 2)  
        mid.append(base[rem])  
  
    return ''.join([str(x) for x in mid[::-1]])  
  
# dec2hex  
# 十进制 to 八进制: oct()   
# 十进制 to 十六进制: hex()   
def dec2hex(string_num):  
    num = int(string_num)  
    mid = []  
    while True:  
        if num == 0: break  
        num,rem = divmod(num, 16)  
        mid.append(base[rem])  
  
    return ''.join([str(x) for x in mid[::-1]])  
  
# hex2tobin  
# 十六进制 to 二进制: bin(int(str,16))   
def hex2bin(string_num):  
    return dec2bin(hex2dec(string_num.upper()))  
  
# bin2hex  
# 二进制 to 十六进制: hex(int(str,2))   
def bin2hex(string_num):  
    return dec2hex(bin2dec(string_num))