readling newlines

[Alessandro Crugnola *sephiroth*]

Hi, I'm trying to detect the newlines method of a file opened.
I'm using the 'U' mode as parameter when opening a file, but for every file opened the result is always "\r\n", even if the file has
been saved with the "\n" newline method.
Is there i'm missing?

I'm on Windows with python 2.3.3

[Samuel Walters]

|Thus Spake Alessandro Crugnola *sephiroth* On the now historical date of
Sat, 10 Jan 2004 14:25:44 +0000|

Hi, I'm trying to detect the newlines method of a file opened. I'm using
the 'U' mode as parameter when opening a file, but for every file opened
the result is always "\r\n", even if the file has been saved with the
"\n" newline method. Is there i'm missing?

I'm on Windows with python 2.3.3

Not quite sure what "U" mode is, but try adding the "b" mode when opening
the file. Windows makes a distinction between binary and text files.
Python defaults to text mode, and since newlines for windows text is \r\n,
that's what Python puts there.

HTH

Sam Walters.

--
Never forget the halloween documents.
http://www.opensource.org/halloween/
""" Where will Microsoft try to drag you today?
Do you really want to go there?"""

[Peter Otten]

Alessandro Crugnola *sephiroth* wrote:

Hi, I'm trying to detect the newlines method of a file opened.
I'm using the 'U' mode as parameter when opening a file, but for every
file opened the result is always "\r\n", even if the file has been saved
with the "\n" newline method. Is there i'm missing?

I'm on Windows with python 2.3.3

Here's what I get (on Linux):

for nl in ["\n", "\r\n", "\n\r", "\r"]: .... dst = file("tmp.txt", "wb")
.... dst.write("one%stwo" % nl)
.... dst.close()
.... print repr(file("tmp.txt", "U").read())
....
'one\ntwo'
'one\ntwo'
'one\n\ntwo'
'one\ntwo'

From the documentation of file():

If Python is built without universal newline support mode 'U' is the same as
normal text mode.

So maybe you have a version without universal newline support?

Peter

[Francis Avila]

Samuel Walters wrote in message ...

Not quite sure what "U" mode is, but try adding the "b" mode when opening

FYI, 'U' is universal newline mode, which will quietly convert the newline
convention of a file into '\n'. I think it has some rudamentary ability to
handle mixed-convention newline ugliness.

See the documentation on file() in the library reference, and there's a PEP
on the feature, too.

--
Francis Avila

[John Roth]

"Alessandro Crugnola *sephiroth*" <al********@sephiroth.it> wrote in message
news:IX********************@news4.tin.it...

Hi, I'm trying to detect the newlines method of a file opened.
I'm using the 'U' mode as parameter when opening a file, but for every file opened the result is always "\r\n", even if the file has been saved with the "\n" newline method.
Is there i'm missing?

I'm on Windows with python 2.3.3
Regardless of what you tell it, Python will always write a text
file with the operating system's line separators. In Windows,
that's \r\n. Universal newline mode only operates on input,
and will translate *all* common system's line separators into
/n.

In other words, if you write a file in text mode using /n, and
then read it back in binary mode, you'll see /r/n for the line
separators. Universal newline support does not change this
because it does not change what you see in binary mode.

John Roth