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Top Forums Shell Programming and Scripting Replace double quotes with a single quote within a double quoted string Post 302900267 by Klashxx on Tuesday 6th of May 2014 02:19:08 AM
Old 05-06-2014
Hi @wisecracker, i just wanted tho show a practical usage of look-ahead/behid assertion, for me the important thing here is not the print statement and of course i can't guarantee python in all *nix boxes.

Also i didn't take care of just single double quotes fields.

Cheers.

Quote:
Originally Posted by wisecracker
Hi klashxx...

Just a couple of points here.
1) It looks as though you are using Python 2.x, (2.7.x), so your print statement would not
work on 3.x.x. Parentheses are needed to make 'print' a function 'print(your stuff here)'
2) Can you guarantee that all UNIX, Linux, CygWin etc, systems have a python version?

EDIT:-
To the OP is the part above the ^ character an error?
Code:
Last login: Mon May  5 19:09:15 on ttys000
AMIGA:barrywalker~> python
Python 2.7.1 (r271:86832, Aug  5 2011, 03:30:24) 
[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import re
>>> text='''1234,"","qwerty",," abcd efg "h" bcd"efg
...  dfg",","","5"'''
>>> print text
1234,"","qwerty",," abcd efg "h" bcd"efg
 dfg",","","5"
>>> 
>>> 
>>> print re.sub(r'(?<![,\A])"(?!(?:(,|\Z)))',"'",text)
1234,"","qwerty",," abcd efg 'h' bcd'efg
 dfg",","","5"
>>> # ^ is this an error?
... # Should it be a "'"?
... 
>>> exit()
AMIGA:barrywalker~> _

This User Gave Thanks to Klashxx For This Post:
 

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PYTHON-CONFIG(1)					      General Commands Manual						  PYTHON-CONFIG(1)

NAME
python-config - output build options for python C/C++ extensions or embedding SYNOPSIS
python-config [ --prefix ] [ --exec-prefix ] [ --includes ] [ --libs ] [ --cflags ] [ --ldflags ] [ --help ] DESCRIPTION
python-config helps compiling and linking programs, which embed the Python interpreter, or extension modules that can be loaded dynamically (at run time) into the interpreter. OPTIONS
--cflags print the C compiler flags. --ldflags print the flags that should be passed to the linker. --includes similar to --cflags but only with -I options (path to python header files). --libs similar to --ldflags but only with -l options (used libraries). --prefix prints the prefix (base directory) under which python can be found. --exec-prefix print the prefix used for executable program directories (such as bin, sbin, etc). --help print the usage message. EXAMPLES
To build the singe-file c program prog against the python library, use gcc $(python-config --cflags --ldflags) progr.cpp -o progr.cpp The same in a makefile: CFLAGS+=$(shell python-config --cflags) LDFLAGS+=$(shell python-config --ldflags) all: progr To build a dynamically loadable python module, use gcc $(python-config --cflags --ldflags) -shared -fPIC progr.cpp -o progr.so SEE ALSO
python (1) http://docs.python.org/extending/extending.html /usr/share/doc/python/faq/extending.html AUTHORS
This manual page was written by Johann Felix Soden <johfel@gmx.de> for the Debian project (and may be used by others). November 27, 2011 PYTHON-CONFIG(1)
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