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annotate python/base_encode.py @ 729:fc4749433229

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https://gist.github.com/adyliu/4494223
author Jeff Hammel <k0scist@gmail.com>
date Wed, 10 Dec 2014 10:08:31 -0800
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children 9c2a18033128
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1 #!/usr/bin/env python
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2 #-*- coding:utf-8 -*-
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3 # Base62 tools (convert number <=> string)
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4 # v1.0/20130109
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5 # python 2.x/3.x supported
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6 #
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7 #author: Ady Liu(imxylz@gmail.com)
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8 #github: github.com/adyliu
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9
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10 import sys
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11
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12 basedigits='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
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13 BASE=len(basedigits)
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14
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15
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16 def decode(s):
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17 ret,mult = 0,1
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18 for c in reversed(s):
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19 ret += mult*basedigits.index(c)
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20 mult *= BASE
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21 return ret
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22
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23 def encode(num):
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24 if num <0: raise Exception("positive number "+num)
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25 if num ==0: return '0'
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26 ret=''
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27 while num != 0:
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28 ret = (basedigits[num%BASE])+ret
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29 num = int(num/BASE)
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30 return ret
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31
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32
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33 if __name__ == '__main__':
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34 if len(sys.argv) < 2:
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35 print("Usage: base62.py <num>...")
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36 sys.exit(1)
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37 width = max(len(x) for x in sys.argv[1:])
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38 for argv in sys.argv[1:]:
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39 try:
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40 num = int(argv)
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41 print('%*s %s %s' % (width,argv,'ENCODE',encode(num)))
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42 except ValueError:
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43 print('%*s %s %s' % (width,argv,'DECODE',decode(argv)))