MonkeeSage wrote:
> On Dec 3, 1:31 am, MonkeeSage <[EMAIL PROTECTED]> wrote:
>> On Dec 2, 11:46 pm, Michael Spencer <[EMAIL PROTECTED]> wrote:
>>
>>
>>
>>> Michael Goerz wrote:
>>>> Hi,
>>>> I am writing unicode stings into a special text file that requires to
>>>> have non-ascii characters as as octal-escaped UTF-8 codes.
>>>> For example, the letter "Í" (latin capital I with acute, code point 205)
>>>> would come out as "\303\215".
>>>> I will also have to read back from the file later on and convert the
>>>> escaped characters back into a unicode string.
>>>> Does anyone have any suggestions on how to go from "Í" to "\303\215" and
>>>> vice versa?
>>> Perhaps something along the lines of:
>>> >>> def encode(source):
>>> ... return "".join("\%o" % ord(c) for c in source.encode('utf8'))
>>> ...
>>> >>> def decode(encoded):
>>> ... bytes = "".join(chr(int(c, 8)) for c in encoded.split('\\')[1:])
>>> ... return bytes.decode('utf8')
>>> ...
>>> >>> encode(u"Í")
>>> '\\303\\215'
>>> >>> print decode(_)
>>> Í
>>> HTH
>>> Michael
>> Nice one. :) If I might suggest a slight variation to handle cases
>> where the "encoded" string contains plain text as well as octal
>> escapes...
>>
>> def decode(encoded):
>> for octc in (c for c in re.findall(r'\\(\d{3})', encoded)):
>> encoded = encoded.replace(r'\%s' % octc, chr(int(octc, 8)))
>> return encoded.decode('utf8')
>>
>> This way it can handle both "\\141\\144\\146\\303\\215\\141\\144\\146"
>> as well as "adf\\303\\215adf".
>>
>> Regards,
>> Jordan
>
> err...
>
> def decode(encoded):
> for octc in re.findall(r'\\(\d{3})', encoded):
> encoded = encoded.replace(r'\%s' % octc, chr(int(octc, 8)))
> return encoded.decode('utf8')
Great suggestions from both of you! I came up with my "final" solution
based on them. It encodes only non-ascii and non-printables, and stays
in unicode strings for both input and output. Also, low ascii values now
encode into a 3-digit octal sequence also, so that decode can catch them
properly.
Thanks a lot,
Michael
____________
import re
def encode(source):
encoded = ""
for character in source:
if (ord(character) < 32) or (ord(character) > 128):
for byte in character.encode('utf8'):
encoded += ("\%03o" % ord(byte))
else:
encoded += character
return encoded.decode('utf-8')
def decode(encoded):
decoded = encoded.encode('utf-8')
for octc in re.findall(r'\\(\d{3})', decoded):
decoded = decoded.replace(r'\%s' % octc, chr(int(octc, 8)))
return decoded.decode('utf8')
orig = u"blaÍblub" + chr(10)
enc = encode(orig)
dec = decode(enc)
print orig
print enc
print dec
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