Python 内置函数进制转换的用法(十进制转二进制、八进制、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))

# -*- coding: UTF-8 -*-

# Filename : test.py
# author by : www.jb51.net

# 获取用户输入十进制数
dec = int(input("输入数字："))

print("十进制数为：", dec)
print("转换为二进制为：", bin(dec))
print("转换为八进制为：", oct(dec))
print("转换为十六进制为：", hex(dec))

def dec2bin(num):
 l = []
 if num < 0:
 return '-' + dec2bin(abs(num))
 while True:
 num, remainder = divmod(num, 2)
 l.append(str(remainder))
 if num == 0:
  return ''.join(l[::-1])

def dec2oct(num):
 l = []
 if num < 0:
 return '-' + dec2oct(abs(num))
 while True:
 num, remainder = divmod(num, 8)
 l.append(str(remainder))
 if num == 0:
  return ''.join(l[::-1])

base = [str(x) for x in range(10)] + [ chr(x) for x in range(ord('A'),ord('A')+6)]
def dec2hex(num):
 l = []
 if num < 0:
 return '-' + dec2hex(abs(num))
 while True:
 num,rem = divmod(num, 16)
 l.append(base[rem])
 if num == 0:
  return ''.join(l[::-1])

def cn(x):
 return x.decode('utf-8')
a=int(raw_input(cn('请输入要转换的数字:')))
b=int(raw_input(cn('请输入要转换的进制:')))
def x(n,k):
 if k==16:
  d=n
  s=""
  while d!=0:
   d,f=divmod(d,k)
   if f==10:
    f='a'
   if f==11:
    f='b'
   if f==12:
    f='c'
   if f==13:
    f='d'
   if f==14:
    f='e'
   if f==15:
    f='f'
   s=str(f)+s
  return s
 elif k==2 or k==8:
  d=n
  s=""
  while d!=0:
   d,f=divmod(d,k)
   s=str(f)+s
  return s
c=x(a,b)
print c
#本程序仅支持2,8,16进制，若想支持更多进制请自己动脑该代码吧！

def baseN(num, b):
  return ((num == 0) and "0") or (baseN(num // b, b).lstrip("0") + "0123456789abcdefghijklmnopqrstuvwxyz"[num % b])