[Python-Dev] "data".decode(encoding) ?!

[M.-A. Lemburg]

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Here's a little fun codec to play with. It encodes the input
using the ROT13 encoding (which is 1-1 and idempotent). The
main difference over the existing codecs is that it returns
a string rather than Unicode.

To install it, simply place it in some directory on your Python 
path.

Here's some sample output (Netscape can unscramble this BTW):

"""
Urer'f n yvggyr sha pbqrp gb cynl jvgu. Vg rapbqrf gur vachg
hfvat gur EBG13 rapbqvat (juvpu vf 1-1 naq vqrzcbgrag). Gur
znva qvssrerapr bire gur rkvfgvat pbqrpf vf gung vg ergheaf
n fgevat engure guna Havpbqr.

Gb vafgnyy vg, fvzcyl cynpr vg va fbzr qverpgbel ba lbhe Clguba 
cngu.
"""

-- 
Marc-Andre Lemburg
______________________________________________________________________
Company & Consulting:                           http://www.egenix.com/
Python Software:                        http://www.lemburg.com/python/
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#!/usr/local/bin/python2.1
""" 
Python Character Mapping Codec for ROT13.

See http://ucsub.colorado.edu/~kominek/rot13/ for details.

Written by Marc-Andre Lemburg (mal@lemburg.com).

"""#"

import codecs

### Codec APIs

class Codec(codecs.Codec):

    def encode(self,input,errors='strict'):

        return codecs.charmap_encode(input,errors,encoding_map)
        
    def decode(self,input,errors='strict'):

        return codecs.charmap_decode(input,errors,decoding_map)

class StreamWriter(Codec,codecs.StreamWriter):
    pass
        
class StreamReader(Codec,codecs.StreamReader):
    pass

### encodings module API

def getregentry():

    return (Codec().encode,Codec().decode,StreamReader,StreamWriter)

### Decoding Map

decoding_map = codecs.make_identity_dict(range(256))
decoding_map.update({
   0x0041: 0x004e,
   0x0042: 0x004f,
   0x0043: 0x0050,
   0x0044: 0x0051,
   0x0045: 0x0052,
   0x0046: 0x0053,
   0x0047: 0x0054,
   0x0048: 0x0055,
   0x0049: 0x0056,
   0x004a: 0x0057,
   0x004b: 0x0058,
   0x004c: 0x0059,
   0x004d: 0x005a,
   0x004e: 0x0041,
   0x004f: 0x0042,
   0x0050: 0x0043,
   0x0051: 0x0044,
   0x0052: 0x0045,
   0x0053: 0x0046,
   0x0054: 0x0047,
   0x0055: 0x0048,
   0x0056: 0x0049,
   0x0057: 0x004a,
   0x0058: 0x004b,
   0x0059: 0x004c,
   0x005a: 0x004d,
   0x0061: 0x006e,
   0x0062: 0x006f,
   0x0063: 0x0070,
   0x0064: 0x0071,
   0x0065: 0x0072,
   0x0066: 0x0073,
   0x0067: 0x0074,
   0x0068: 0x0075,
   0x0069: 0x0076,
   0x006a: 0x0077,
   0x006b: 0x0078,
   0x006c: 0x0079,
   0x006d: 0x007a,
   0x006e: 0x0061,
   0x006f: 0x0062,
   0x0070: 0x0063,
   0x0071: 0x0064,
   0x0072: 0x0065,
   0x0073: 0x0066,
   0x0074: 0x0067,
   0x0075: 0x0068,
   0x0076: 0x0069,
   0x0077: 0x006a,
   0x0078: 0x006b,
   0x0079: 0x006c,
   0x007a: 0x006d,
})

### Encoding Map

encoding_map = {}
for k,v in decoding_map.items():
    encoding_map[v] = k

### Filter API

def rot13(infile, outfile):
    outfile.write(infile.read().encode('rot-13'))

if __name__ == '__main__':
    import sys
    rot13(sys.stdin, sys.stdout)

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