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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