使用Python內置函數：bin()、oct()、int()、hex()可實現進制轉換。
先看Python官方文檔中對這幾個內置函數的描述：
bin(x)
Convert an integer number to a binary string. The result is a valid Python expression. If x is not a Python int object, it has to define an __index__() method that returns an integer.
oct(x)
Convert an integer number to an octal string. The result is a valid Python expression. If x is not a Python int object, it has to define an __index__() method that returns an integer.
int([number | string[, base]])
Convert a number or string to an integer. If no arguments are given, return 0. If a number is given, return number.__int__(). Conversion of floating point numbers to integers truncates towards zero. A string must be a base-radix integer literal optionally preceded by ‘+' or ‘-‘ (with no space in between) and optionally surrounded by whitespace. A base-n literal consists of the digits 0 to n-1, with ‘a' to ‘z' (or ‘A' to ‘Z') having values 10 to 35. The default base is 10. The allowed values are 0 and 2-36. Base-2, -8, and -16 literals can be optionally prefixed with 0b/0B, 0o/0O, or 0x/0X, as with integer literals in code. Base 0 means to interpret exactly as a code literal, so that the actual base is 2, 8, 10, or 16, and so that int('010', 0) is not legal, while int('010') is, as well as int('010', 8).
hex(x)
Convert an integer number to a hexadecimal string. The result is a valid Python expression. If x is not a Python int object, it has to define an __index__() method that returns an integer.
| ↓ | 2進制 | 8進制 | 10進制 | 16進制 |
| 2進制 | - | bin(int(x, 8)) | bin(int(x, 10)) | bin(int(x, 16)) |
| 8進制 | oct(int(x, 2)) | - | oct(int(x, 10)) | oct(int(x, 16)) |
| 10進制 | int(x, 2) | int(x, 8) | - | int(x, 16) |
| 16進制 | hex(int(x, 2)) | hex(int(x, 8)) | hex(int(x, 10)) | - |
bin()、oct()、hex()的返回值均為字符串，且分別帶有0b、0o、0x前綴。
Python進制轉換（二進制、十進制和十六進制）實例
#!/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# 二進制 to 十進制: int(str,n=10) def bin2dec(string_num): return str(int(string_num, 2))# hex2dec# 十六進制 to 十進制def hex2dec(string_num): return str(int(string_num.upper(), 16))# dec2bin# 十進制 to 二進制: 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# 十進制 to 八進制: oct() # 十進制 to 十六進制: 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# 十六進制 to 二進制: bin(int(str,16)) def hex2bin(string_num): return dec2bin(hex2dec(string_num.upper()))# bin2hex# 二進制 to 十六進制: hex(int(str,2)) def bin2hex(string_num): return dec2hex(bin2dec(string_num))以下代碼用于實現十進制轉二進制、八進制、十六進制：
# -*- coding: UTF-8 -*-# Filename : test.py# author by : m.survivalescaperooms.com# 獲取用戶輸入十進制數dec = int(input("輸入數字："))print("十進制數為：", dec)print("轉換為二進制為：", bin(dec))print("轉換為八進制為：", oct(dec))print("轉換為十六進制為：", hex(dec))執行以上代碼輸出結果為：
python3 test.py
輸入數字：5
十進制數為：5
轉換為二進制為： 0b101
轉換為八進制為： 0o5
轉換為十六進制為： 0x5
python3 test.py
輸入數字：12
十進制數為：12
轉換為二進制為： 0b1100
轉換為八進制為： 0o14
轉換為十六進制為： 0xc
具體實現
十進制到二進制：
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])
十進制到八進制：
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])
十進制到十六進制：
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])python進2、8、16制轉換源碼
def cn(x): return x.decode('utf-8')a=int(raw_input(cn('請輸入要轉換的數字:')))b=int(raw_input(cn('請輸入要轉換的進制:')))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 sc=x(a,b)print c#本程序僅支持2,8,16進制，若想支持更多進制請自己動腦該代碼吧！python 十進制整數轉換為任意進制（36以內）
def baseN(num, b): return ((num == 0) and "0") or (baseN(num // b, b).lstrip("0") + "0123456789abcdefghijklmnopqrstuvwxyz"[num % b])這篇文章就結束到這，需要的朋友可以參考一下，希望大家以后多多支持VEVB武林網。
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