Python中不同进制互相转换（二进制、八进制、十进制和十六进制）

#!/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):   return str(int(string_num, 2))  # hex2dec # 十六进制 to 十进制 def hex2dec(string_num):   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))