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https://github.com/python/cpython
Revision 64a820b4a2a5a55561bf3200dc67068ea19ff2a1 authored by R. David Murray on 11 November 2010, 20:17:16 UTC, committed by R. David Murray on 11 November 2010, 20:17:16 UTC
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  r86414 | r.david.murray | 2010-11-11 15:09:20 -0500 (Thu, 11 Nov 2010) | 8 lines

  #1466065: add validate option to base64.b64decode

  Patch by Neil Tallim.  This provides a mechanism for module
  users to achieve RFC 3548 compliance in the cases where ignoring
  non-base64-alphabet input characters is *not* mandated by the RFC that
  references RFC 3548.
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Tip revision: 64a820b4a2a5a55561bf3200dc67068ea19ff2a1 authored by R. David Murray on 11 November 2010, 20:17:16 UTC
Blocked revisions 86414 via svnmerge
Tip revision: 64a820b
this.py
s = """Gur Mra bs Clguba, ol Gvz Crgref

Ornhgvshy vf orggre guna htyl.
Rkcyvpvg vf orggre guna vzcyvpvg.
Fvzcyr vf orggre guna pbzcyrk.
Pbzcyrk vf orggre guna pbzcyvpngrq.
Syng vf orggre guna arfgrq.
Fcnefr vf orggre guna qrafr.
Ernqnovyvgl pbhagf.
Fcrpvny pnfrf nera'g fcrpvny rabhtu gb oernx gur ehyrf.
Nygubhtu cenpgvpnyvgl orngf chevgl.
Reebef fubhyq arire cnff fvyragyl.
Hayrff rkcyvpvgyl fvyraprq.
Va gur snpr bs nzovthvgl, ershfr gur grzcgngvba gb thrff.
Gurer fubhyq or bar-- naq cersrenoyl bayl bar --boivbhf jnl gb qb vg.
Nygubhtu gung jnl znl abg or boivbhf ng svefg hayrff lbh'er Qhgpu.
Abj vf orggre guna arire.
Nygubhtu arire vf bsgra orggre guna *evtug* abj.
Vs gur vzcyrzragngvba vf uneq gb rkcynva, vg'f n onq vqrn.
Vs gur vzcyrzragngvba vf rnfl gb rkcynva, vg znl or n tbbq vqrn.
Anzrfcnprf ner bar ubaxvat terng vqrn -- yrg'f qb zber bs gubfr!"""

d = {}
for c in (65, 97):
    for i in range(26):
        d[chr(i+c)] = chr((i+13) % 26 + c)

print("".join([d.get(c, c) for c in s]))
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