python内置进制转换

python内置进制转换

原文来自脚本之家:https://www.jb51.net/article/139206.htm

使用Python内置函数:bin()、oct()、int()、hex()可实现进制转换。

2进制 8进制 10进制 16进制
2进制 - bin(int(x, 8)) bin(int(x, 10)) bin(int(x, 16))
8进制 oct(int(x, 2)) - oct(int(x, 10)) oct(int(x, 16))
10进制 int(x, 2) int(x, 8) - int(x, 16)
16进制 hex(int(x, 2)) hex(int(x, 8)) hex(int(x, 10)) -

bin()、oct()、hex()的返回值均为字符串,且分别带有0b、0o、0x前缀。

内置函数

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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))


# 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))

实现原理

十进制到二进制:

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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])

十进制到八进制:

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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])

十进制到十六进制:

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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二进制,八进制,十六进制转换源码

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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

python 十进制整数转换为36进制以内任意进制

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