Replacing utf-8 characters

[Mike]

Hi, I am using Python to scrape web pages and I do not have problem
unless I run into a site that is utf-8. It seems & is changed to &
when the site is utf-8.

If I try to replace it with .replace('& ','&') it for some reason
does not replace it.

For example: http://today.reuters.co.uk/news/default.aspx

The url in the page looks like this

http://today.reuters.co.uk/news/NewsArticle.aspx?type=topNews&storyID=2005-10-05T140937Z_01_MCC423599_RTRUKOC_0_UK-BRITAIN-CONSERVATIVES.xml

However when I pull it into python the URL ends up looking like this
(notice the & instead of just & in the URL)

http://today.reuters.co.uk/news/newsArticle.aspx?type=businessNews&storyID=2005-10-05T094354Z_01_MOL530411_RTRUKOC_0_UK-CONSTRUCTION-BPB-STGOBAIN.xml

Any ideas?

[Richard Brodie]

Re: Replacing utf-8 characters


"Mike" <no@spam> wrote in message news:1128522921 .72009@nntp.ace cape.com...
[color=blue]
> However when I pull it into python the URL ends up looking like this
> (notice the &amp; instead of just & in the URL)
>
> Any ideas?[/color]

Some code would be helpful: the "&amp;" is in the page source to start
with (which is as it ought to be). What are you using to parse the HTML?

[Mike]

Re: Replacing utf-8 characters

For example this is what I am trying to do that is not working.

The contents of link is the reuters web page, containing

"/news/newsArticle.asp x?type=business News&amp;amp;st oryID=2005-10-05T151245Z_01_H O548006_RTRUKOC _0_UK-AIRLINES-BA.xml"

link = link.replace('& amp;amp;','&')

But if I now view the the contents link it shows it the same as when it
was assigned.




Richard Brodie wrote:[color=blue]
> "Mike" <no@spam> wrote in message news:1128522921 .72009@nntp.ace cape.com...
>
>[color=green]
>>However when I pull it into python the URL ends up looking like this
>>(notice the &amp; instead of just & in the URL)
>>
>>Any ideas?[/color]
>
>
> Some code would be helpful: the "&amp;" is in the page source to start
> with (which is as it ought to be). What are you using to parse the HTML?
>
>[/color]

[Steve Holden]

Re: Replacing utf-8 characters

Unknown wrote:[color=blue]
> For example this is what I am trying to do that is not working.
>
> The contents of link is the reuters web page, containing
>
> "/news/newsArticle.asp x?type=business News&amp;amp;st oryID=2005-10-05T151245Z_01_H O548006_RTRUKOC _0_UK-AIRLINES-BA.xml"
>
> link = link.replace('& amp;amp;','&')
>
> But if I now view the the contents link it shows it the same as when it
> was assigned.
>
>
>
>
> Richard Brodie wrote:
>[color=green]
>>"Mike" <no@spam> wrote in message news:1128522921 .72009@nntp.ace cape.com...
>>
>>
>>[color=darkred]
>>>However when I pull it into python the URL ends up looking like this
>>>(notice the &amp; instead of just & in the URL)
>>>
>>>Any ideas?[/color]
>>
>>
>>Some code would be helpful: the "&amp;" is in the page source to start
>>with (which is as it ought to be). What are you using to parse the HTML?
>>
>>[/color][/color]
You must be doing *something* wrong:
[color=blue][color=green][color=darkred]
>>> link =[/color][/color][/color]
"/news/newsArticle.asp x?type=business News&amp;amp;st oryID=2005-10-05T151245Z_01_H O548006_RTRUKOC _0_UK-AIRLINES-BA.xml"[color=blue][color=green][color=darkred]
>>> link = link.replace('& amp;amp;','&')
>>> link[/color][/color][/color]
'/news/newsArticle.asp x?type=business News&storyID=20 05-10-05T151245Z_01_H O548006_RTRUKOC _0_UK-AIRLINES-BA.xml'[color=blue][color=green][color=darkred]
>>>[/color][/color][/color]

regards
Steve
--
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC www.holdenweb.com
PyCon TX 2006 www.python.org/pycon/

[Mike]

Re: Replacing utf-8 characters

Steve Holden wrote:
[color=blue][color=green][color=darkred]
>>>[/color][/color]
> You must be doing *something* wrong:
>[color=green][color=darkred]
> >>> link =[/color][/color]
> "/news/newsArticle.asp x?type=business News&amp;amp;st oryID=2005-10-05T151245Z_01_H O548006_RTRUKOC _0_UK-AIRLINES-BA.xml"
>[color=green][color=darkred]
> >>> link = link.replace('& amp;amp;','&')
> >>> link[/color][/color]
> '/news/newsArticle.asp x?type=business News&storyID=20 05-10-05T151245Z_01_H O548006_RTRUKOC _0_UK-AIRLINES-BA.xml'
>[color=green][color=darkred]
> >>>[/color][/color]
>
> regards
> Steve[/color]

What you and I typed was ascii. The value of link came from importing
that utf-8 web page into that variable. That is why I think it is not
working. But not sure what the solution is.

[Klaus Alexander Seistrup]

Re: Replacing utf-8 characters

Mike wrote:
[color=blue]
> Hi, I am using Python to scrape web pages and I do not have problem
> unless I run into a site that is utf-8. It seems & is changed to
> &amp; when the site is utf-8.
>
> [...][/color]
[color=blue]
> Any ideas?[/color]

How about using the universal feedparser from feedparser.org to fetch
and parse the RSS from Reuters? That's what I do and it works like a
charm.

#v+
[color=blue][color=green][color=darkred]
>>> import feedparser
>>> rss = feedparser.pars e('http://today.reuters.c om/rss/topNews')
>>> for what in ('link', 'title', 'summary'):[/color][/color][/color]
.... print rss.entries[0][what]
.... print
....

http://today.reuters.com/news/newsarticle.aspx?type=topNews&storyid=2005-10-05T193846Z_01_DIT561620_RTRUKOC_0_US-COURT-SUICIDE.xml

Top court seems closely divided on suicide law

During arguments, the justices sharply questioned both sides on whether then-Attorney General John Ashcroft had the power under federal law in 2001 to bar distribution of controlled drugs to assist suicides, regardless of state law.[color=blue][color=green][color=darkred]
>>>[/color][/color][/color]

#v-

Cheers,

--
Klaus Alexander Seistrup
Magnetic Ink, Copenhagen, Denmark

http://magnetic-ink.dk/

[Mike]

Re: Replacing utf-8 characters

In playing with this I found link.replace does work but when I use

link.replace('& amp;','&')

it replaces it with &amp; instead of just &. link.replace is working
for me since if I changed the second option from & to something else I
see the change.

So it seems link.replace() function reads whether the first option is
utf-8 and converts the second option automatically to utf-8? How do I
prevent that?

Thanks again.

[David Bolen]

Re: Replacing utf-8 characters

Mike <no@spam> writes:
[color=blue]
> What you and I typed was ascii. The value of link came from importing
> that utf-8 web page into that variable. That is why I think it is not
> working. But not sure what the solution is.[/color]

Are you sure you're asking what you think you are asking? Both the
ampersand character (&) and the characters within the ampersand entity
character reference (&amp;) are ASCII. As it turns out they are also
legal UTF-8, but I would not call a web page UTF-8 just because I saw
the sequence of characters "&amp;" within the stream. (That's not to
say it isn't UTF-8 encoded, just that I don't think that's the issue)

I'm just guessing, but you do realize that legal HTML should quote all
uses of the ampersand character with an entity reference, since the
ampersand itself is reserved for use in such references. This
includes URL references whether inside attributes or in the body of
the text.

So when you see something in a browser in a web page that shows a URL
that includes "&" such as for separating parameters, internally that
page is (or should be) stored with "&amp;" for that character. Thus
if you retrieve the page in code, that's what you'll find. It's the
browser processing that entity reference that turns it back into the
"&" for presentation.

Note that whether or not the page in question is encoded as UTF-8 is a
completely distinct question - whatever encoding the page is in would
be used to encode the characters in the entity reference (namely
"&amp;").

I'm assuming that in scraping the page you want to reverse the process
(e.g., perform the interpretation of the entity references much as a
browser would) before using that URL for other purposes. If so, the
string replacement you tried should handle the replacement just fine,
at least within the value of the URL as managed by your code.

You then mention it being the same when you view the contents of the
link, which isn't quite clear to me, but if that means retrieving
another copy of the link as embedded in an HTML page then yes, it'll
get quoted again since as initially, you have to quote an ampersand
as an entity reference within HTML.

What did you mean by "view the contents link"?

-- David

[Martin v. Löwis]

Re: Replacing utf-8 characters

Mike wrote:[color=blue]
> So it seems link.replace() function reads whether the first option is
> utf-8 and converts the second option automatically to utf-8? How do I
> prevent that?[/color]

Not sure what an option is... if you are talking about parameters,
rest assured that <string>.replac e does not know or care whether any
of its parameters is encoded in UTF-8. Also not sure where you got
the impression UTF-8 could have to do anything with this.

Regards,
Martin