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To: Anatoli Hristov <tolidtm@gmail.com>
From: Nick Dokos <nicholas.dokos@hp.com>
Subject: Re: Help writelines
In-Reply-To: Message from Anatoli Hristov <tolidtm@gmail.com> of "Fri\, 03 Feb 2012 21\:27\:48 +0100." <CAKhY55OeHanpWC=WfzMo1nzujsrVC2oAD89R6So3ZG3mobBphg@mail.gmail.com>
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Date: Fri, 03 Feb 2012 15:47:37 -0500
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:19843

Anatoli Hristov <tolidtm@gmail.com> wrote:

> Hi everyone,
>=20
> I`m totaly new in python and trying to figure out - how to write a list t=
o a file with a newline at the end of each object.
> I tried alot of combinations :) like:
> users =3D ['toli','didi']
> fob=3Dopen('c:/Python27/Toli/username','w')
> fob.writelines(users) + '%s\N'
> fob.close()
> =C2=A0or=C2=A0fob.writelines('\N' % users)=C2=A0
> or=C2=A0fob.writelines('%s\N' % users)
> but nothing of dose works...
>=20
> Could you help me find out the right syntaxes?
>=20

>From the docs:

 |  writelines(...)
 |      writelines(sequence_of_strings) -> None.  Write the strings to the =
file.
 |=20=20=20=20=20=20
 |      Note that newlines are not added.  The sequence can be any iterable=
 object
 |      producing strings. This is equivalent to calling write() for each s=
tring.

So *you* need to add the newlines, e.g. you can use a list comprehension:

   fob.writelines(["%s\n" % (x) for x in users])

or write in a loop:

   for u in users:
       fob.write("%s\n" % (u))

or join the list elements together with a newline separator (but you'll
need to add a final newline by hand):

   fob.writelines("\n".join(users) + "\n")

or ...

Nick