Re: [Jython-users] Converting between a byte string and a text string?

[Alex G. <ale...@ne...>]

18.04.2011 03:22, Dan Stromberg kirjoitti:
> How does one, in Jython 2.5.2, convert from a byte string to a text
> string, and vice versa?
The same way as you do in all other Pythons: 'blah'.decode(encoding).
> I'd like to support Jython in my opensource python2x3 module, but
> Jython's string handling seems different enough from that of other
> Pythons that I'm not clear on how to do so.  I found an article saying
> that if you do a binary read in Jython, you'll get a binary str that
> just keeps the high bytes zeroed
Link? Sounds a little odd.
> , but I didn't notice anything about
> converting from one (always zero high bytes to nonzero high bytes, for
> EG) to the other.
>
> Python2x3's at http://stromberg.dnsalias.org/svn/python2x3/trunk - and
> I'm including a copy at the bottom of this message.
The worst problem in writing cross-version code is entering unicode/byte 
literals.
Does Python2x3 solve this somehow?
> TIA!
>
> #!/usr/bin/python
>
> '''Provides code and data to facilitate writing python code that runs
> on 2.x and 3.x, including pypy'''
>
> # I'm afraid pylint won't like this one...
>
> import sys
> import platform
>
> def python_major(result = int(platform.python_version_tuple()[0])):
>          '''Return an integer corresponding to the major version # of
> the python interpreter we're running on'''
>          return result
>
> if python_major() == 2:
>          empty_bytes = ''
>          null_byte = '\0'
>          bytes_type = str
>          def intlist_to_binary(intlist):
>                  '''Convert a list of integers to a binary string type'''
>                  return ''.join(chr(byte) for byte in intlist)
>          def string_to_binary(string):
>                  '''Convert a text string to a binary string type'''
>                  return string
>          def binary_to_intlist(binary):
>                  '''Convert a binary string to a list of integers'''
>                  return [ ord(character) for character in binary ]
>          def binary_to_string(binary):
>                  '''Convert a binary string to a text string'''
>                  return binary
> elif python_major() == 3:
>          empty_bytes = ''.encode('utf-8')
>          null_byte = bytes([ 0 ])
>          bytes_type = bytes
>          def intlist_to_binary(intlist):
>                  '''Convert a list of integers to a binary string type'''
>                  return bytes(intlist)
>          def string_to_binary(string):
>                  '''Convert a text string (or binary string type) to a
> binary string type'''
>                  if isinstance(string, str):
>                          return string.encode('latin-1')
>                  else:
>                          return string
>          def binary_to_intlist(binary):
>                  '''Convert a binary string to a list of integers'''
>                  return binary
>          def binary_to_string(binary):
>                  '''Convert a binary string to a text string'''
>                  return binary.decode('latin-1')
> else:
>          sys.stderr.write('%s: Python<  2 or>  3 not (yet) supported\n'
> % sys.argv[0])
>          sys.exit(1)
>
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