How to convert an integer to a string in any base?

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清歌不尽
清歌不尽 2020-11-22 02:25

Python allows easy creation of an integer from a string of a given base via

int(str, base). 

I want to perform the inverse: creati

27条回答
  •  囚心锁ツ
    2020-11-22 02:58

    http://code.activestate.com/recipes/65212/

    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
    

    Here's another one from the same link

    def baseconvert(n, base):
        """convert positive decimal integer n to equivalent in another base (2-36)"""
    
        digits = "0123456789abcdefghijklmnopqrstuvwxyz"
    
        try:
            n = int(n)
            base = int(base)
        except:
            return ""
    
        if n < 0 or base < 2 or base > 36:
            return ""
    
        s = ""
        while 1:
            r = n % base
            s = digits[r] + s
            n = n / base
            if n == 0:
                break
    
        return s
    

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