(please avoid top-posting... corrected)
On Mon, 14 Apr 2008 09:08:06 +0200, Penny Y. <[EMAIL PROTECTED]> wrote:
> -----邮件原件-----
> 发件人: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] 代表 Gabriel
> Genellina
> 发送时间: 2008年4月14日 12:59
> 收件人: python-list@python.org
> 主题: Re: how to remove \n in the list
>
> En Mon, 14 Apr 2008 01:41:55 -0300, reetesh nigam
> <[EMAIL PROTECTED]> escribió:
>
>> hi,
>> l=['5\n', '2\n', '7\n', '3\n', '6\n']
>>
>> how to remove \n from the given list
>
> l is is very poor name... I'll use lines instead:
>
> lines[:] = [line.rstrip('\n') for line in lines]
> ---
>
> why not just:
>
> lines = [line.rstrip('\n') for line in lines]
>
>
> what's the difference between lines[:] and lines here? Thanks.
Compare:
>>> lines = ['5\n', '2\n', '7\n', '3\n', '6\n']
>>> lines2 = lines
>>> lines = [line.rstrip('\n') for line in lines]
>>> lines
['5', '2', '7', '3', '6']
>>> lines2
['5\n', '2\n', '7\n', '3\n', '6\n']
with:
>>> lines = ['5\n', '2\n', '7\n', '3\n', '6\n']
>>> lines2 = lines
>>> lines[:] = [line.rstrip('\n') for line in lines]
>>> lines
['5', '2', '7', '3', '6']
>>> lines2
['5', '2', '7', '3', '6']
Assigning to lines[:] changes the original list. Assigning to lines
rebinds the name to the result of the list comprehension, but doesn't
affect the original list.
HTH
--
python -c "print ''.join([chr(154 - ord(c)) for c in
'U(17zX(%,5.zmz5(17l8(%,5.Z*(93-965$l7+-'])"
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