【下载文档:  Python任意字符串转16, 32, 64进制的方法.txt 】

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Python任意字符串转16, 32, 64进制的方法
Python字符串转数字
import binascii
s = 'test123456test'
str_16 = binascii.b2a_hex(s.encode('utf-8')) # 字符串转16进制
print(str_16)
def baseN(num, b):
return ((num == 0) and "0") or \
(baseN(num // b, b).lstrip("0") + "0123456789abcdefghijklmnopqrstuvwxyz"[num % b])
num_10 = int(str_16, 16) # 16进制转10进制
print(num_10)
str_32 = baseN(num_10, 32) # 10进制转32进制
print(str_32)
num_10_2 = int(str_32, 32) # 32进制转10进制
print(num_10_2)
num_16 = hex(num_10) # 10进制转16进制数
print(num_16)
ss = str_16.decode('hex') # 16进制串转字符串
print(ss)
执行结果
7465737431323334353674657374
2360797289681380981751517517542260
1q6asrk64p36d1l6pq6asrk
2360797289681380981751517517542260
0x7465737431323334353674657374L
test123456test
10进制转n进制
def base10toN(num,n):
"""Change a to a base-n number.
Up to base-36 is supported without special notation."""
num_rep={10:'a',
11:'b',
12:'c',
13:'d',
14:'e',
15:'f',
16:'g',
17:'h',
18:'i',
19:'j',
20:'k',
21:'l',
22:'m',
23:'n',
24:'o',
25:'p',
26:'q',
27:'r',
28:'s',
29:'t',
30:'u',
31:'v',
32:'w',
33:'x',
34:'y',
35:'z'}
new_num_string=''
current=num
while current!=0:
remainder=current%n
if 36>remainder>9:
remainder_string=num_rep[remainder]
elif remainder>=36:
remainder_string='('+str(remainder)+')'
else:
remainder_string=str(remainder)
new_num_string=remainder_string+new_num_string
current=current/n
return new_num_string
进阶版
def baseN(num, b):
return ((num == 0) and "0") or \
(baseN(num // b, b).lstrip("0") + "0123456789abcdefghijklmnopqrstuvwxyz"[num % b])
64进制
def encode_b64(n):
table = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_'
result = []
temp = n
if 0 == temp:
result.append('0')
else:
while 0 < temp:
result.append(table[temp % 64])
temp /= 64
return ''.join([x for x in reversed(result)])
def decode_b64(str):
table = {"0": 0, "1": 1, "2": 2, "3": 3, "4": 4, "5": 5,
"6": 6, "7": 7, "8": 8, "9": 9,
"a": 10, "b": 11, "c": 12, "d": 13, "e": 14, "f": 15, "g": 16,
"h": 17, "i": 18, "j": 19, "k": 20, "l": 21, "m": 22, "n": 23,
"o": 24, "p": 25, "q": 26, "r": 27, "s": 28, "t": 29, "u": 30,
"v": 31, "w": 32, "x": 33, "y": 34, "z": 35,
"A": 36, "B": 37, "C": 38, "D": 39, "E": 40, "F": 41, "G": 42,
"H": 43, "I": 44, "J": 45, "K": 46, "L": 47, "M": 48, "N": 49,
"O": 50, "P": 51, "Q": 52, "R": 53, "S": 54, "T": 55, "U": 56,
"V": 57, "W": 58, "X": 59, "Y": 60, "Z": 61,
"-": 62, "_": 63}
result = 0
for i in xrange(len(str)):
result *= 64
result += table[str[i]]
return result
Java字符串转数字
BigInteger integer = new BigInteger(hexString.toString(), 16);
integer.toString(32);
import java.math.BigInteger;
public class Main {
public static void main(String[] argv) throws Exception {
BigInteger bi = new BigInteger("1023");
bi = new BigInteger("1111111111", 2);
String s = bi.toString(2);
System.out.println(s);
bi = new BigInteger("1000", 8);
System.out.println(s = bi.toString(8));
bi = new BigInteger("1023");
s = bi.toString();
System.out.println(s);
bi = new BigInteger("3ff", 16);
s = bi.toString(16);
System.out.println(s);
}
}
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