how to split text into lines?

[kj]

In Perl, one can break a chunk of text into an array of lines while
preserving the trailing line-termination sequence in each line, if
any, by splitting the text on the regular expression /^/:

DB<1x split(/^/, "foo\nbar\nbaz" )
0 'foo
'
1 'bar
'
2 'baz'

But nothing like this seems to work in Python:

>>re.split('^ ', 'foo\nbar\nbaz' )

['foo\nbar\nbaz']

(One gets the same result if one adds the re.MULTILINE flag to the
re.split call.)

What's the Python idiom for splitting text into lines, preserving
the end-of-line sequence in each line?
--
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.

[kj]

Re: how to split text into lines?

In <g6qjmc$f2o$1@r eader1.panix.co mkj <socyl@987jk.co m.invalidwrites :

>In Perl, one can break a chunk of text into an array of lines while
>preserving the trailing line-termination sequence in each line, if
>any, by splitting the text on the regular expression /^/:

DB<1x split(/^/, "foo\nbar\nbaz" )
>0 'foo
>'
>1 'bar
>'
>2 'baz'

>But nothing like this seems to work in Python:

>>>re.split('^' , 'foo\nbar\nbaz' )

>['foo\nbar\nbaz']

>(One gets the same result if one adds the re.MULTILINE flag to the
>re.split call.)

>What's the Python idiom for splitting text into lines, preserving
>the end-of-line sequence in each line?

Sorry, I should have googled this first. I just found splitlines()...

Still, for my own edification, is there a way to achieve the same
effect using re.split?

TIA!

kynn

--
NOTE: In my address everything before the first period is backwards;
and the last period, and everything after it, should be discarded.

[Miles]

Re: how to split text into lines?

On Wed, Jul 30, 2008 at 4:45 PM, kj wrote:

>>What's the Python idiom for splitting text into lines, preserving
>>the end-of-line sequence in each line?

>
>
Sorry, I should have googled this first. I just found splitlines()...
>
Still, for my own edification, is there a way to achieve the same
effect using re.split?

Not directly: re.split doesn't split on zero-length matches.

http://mail.python.org/pipermail/python-dev/2004-August/047272.html

http://bugs.python.org/issue852532

http://bugs.python.org/issue988761

http://bugs.python.org/issue3262

-Miles

[alex23]

Re: how to split text into lines?

kj wrote:

Sorry, I should have googled this first.  I just found splitlines()...
>
Still, for my own edification, is there a way to achieve the same
effect using re.split?

re.split(os.lin esep, <string>) works the same as <string>.splitl ines()

Neither retain the EOL for each line, though. The only way I'm aware
of is to re-add it:

[s+os.linesep for s in re.split(os.lin esep, <string>)]

Was that what you were after?

[Chris]

Re: how to split text into lines?

On Jul 31, 7:26 am, alex23 <wuwe...@gmail. comwrote:

kj wrote:

Sorry, I should have googled this first.  I just found splitlines()... .

>

Still, for my own edification, is there a way to achieve the same
effect using re.split?

>
re.split(os.lin esep, <string>) works the same as <string>.splitl ines()
>
Neither retain the EOL for each line, though. The only way I'm aware
of is to re-add it:
>
[s+os.linesep for s in re.split(os.lin esep, <string>)]
>
Was that what you were after?

or what about 'string'.splitl ines(True) as that retains newline
characters. ;)

[alex23]

Re: how to split text into lines?

Chris wrote:

or what about 'string'.splitl ines(True) as that retains newline
characters. ;)

Okay, you win :)

Man, you'd think with the ease of object introspection I'd have at
least looked at its docstring :)

Cheers, Chris!