469,336 Members | 5,570 Online
Bytes | Developer Community
New Post

Home Posts Topics Members FAQ

Post your question to a community of 469,336 developers. It's quick & easy.

Easy way to remove HTML entities from an HTML document?

Is there a module/function to remove all the HTML entities from an HTML
document (e.g. - &nbsp, &amp, &apos, etc.)?

If not I'll just write one myself but I figured I'd save myself some time.

Thanks,
--
Robert
Jul 18 '05 #1
7 11813
On Sun, 25 Jul 2004, Robert Oschler wrote:
Is there a module/function to remove all the HTML entities from an HTML
document (e.g. - &nbsp, &amp, &apos, etc.)?


htmllib has this capability, but if you're not doing any other HTML
parsing, a regex, coupled with htmllib's helper module, htmlentitydefs,
does nicely:

import re
import htmlentitydefs

def convertentity(m):
if m.group(1)=='#':
try:
return chr(int(m.group(2)))
except ValueError:
return '&#%s;' % m.group(2)
try:
return htmlentitydefs.entitydefs[m.group(2)]
except KeyError:
return '&%s;' % m.group(2)

def converthtml(s):
return re.sub(r'&(#?)(.+?);',convert,s)

converthtml('Some &lt;html&gt; string.') # --> 'Some <html> string.'

Unknown or invalid entities are left in &xxx; format, while also leaving
Unicode entities in &#nnn; format. If you want a Unicode string to be
returned (and Unicode entities interpreted), replace 'chr' with 'unichr',
and 'htmlentitydefs.entitydefs[m.group(2)]' with
'unichr(htmlentitydefs.name2codepoint[m.group(2)])'.

Hope this helps.

Jul 18 '05 #2
"Robert Oschler" <no_replies@fake_email_address.invalid> wrote in message news:<X9*****************@bignews5.bellsouth.net>. ..
Is there a module/function to remove all the HTML entities from an HTML
document (e.g. - &nbsp, &amp, &apos, etc.)?

If not I'll just write one myself but I figured I'd save myself some time.

Thanks,

check out mark pilgrims site: http://diveintopython.org/html_processing/index.html
Jul 18 '05 #3
"Christopher T King" <sq******@WPI.EDU> wrote in message
news:Pi**************************************@ccc6 .wpi.edu...

htmllib has this capability, but if you're not doing any other HTML
parsing, a regex, coupled with htmllib's helper module, htmlentitydefs,
does nicely:

import re
import htmlentitydefs

def convertentity(m):
if m.group(1)=='#':
try:
return chr(int(m.group(2)))
except ValueError:
return '&#%s;' % m.group(2)
try:
return htmlentitydefs.entitydefs[m.group(2)]
except KeyError:
return '&%s;' % m.group(2)

def converthtml(s):
return re.sub(r'&(#?)(.+?);',convert,s)

converthtml('Some &lt;html&gt; string.') # --> 'Some <html> string.'

Unknown or invalid entities are left in &xxx; format, while also leaving
Unicode entities in &#nnn; format. If you want a Unicode string to be
returned (and Unicode entities interpreted), replace 'chr' with 'unichr',
and 'htmlentitydefs.entitydefs[m.group(2)]' with
'unichr(htmlentitydefs.name2codepoint[m.group(2)])'.

Hope this helps.


Chris,

I believe the line that reads:

def converthtml(s):
return re.sub(r'&(#?)(.+?);',convert,s)

Should read:

def converthtml(s):
return re.sub(r'&(#?)(.+?);',convertentity,s)

Once I made that change it worked like a charm. I'm showing the correction
for future Usenet searchers.

So you can pass a function to re.sub() as the replacement patttern? Very
cool, I didn't know that. I think you could spend a year just learning
regular expressions and still miss something.
Thanks,
Robert.
Jul 18 '05 #4
On Mon, 26 Jul 2004, Robert Oschler wrote:
I believe the line that reads:

def converthtml(s):
return re.sub(r'&(#?)(.+?);',convert,s)

Should read:

def converthtml(s):
return re.sub(r'&(#?)(.+?);',convertentity,s)
Oops, you're right, mea culpa :)
So you can pass a function to re.sub() as the replacement patttern? Very
cool, I didn't know that. I think you could spend a year just learning
regular expressions and still miss something.


That feature is only mentioned briefly in the online docs, and not at all
in sre.sub's docstring. Surprising, since it's indeed a very useful
feature.

Jul 18 '05 #5
"Christopher T King" <sq******@WPI.EDU> wrote in message
news:Pi*************************************@ccc1. wpi.edu...

That feature is only mentioned briefly in the online docs, and not at all
in sre.sub's docstring. Surprising, since it's indeed a very useful
feature.


Chris,

Speaking of learning cool things by osmosis, do you know of a well commented
source of Python code, perhaps an Open Source project, that I could study to
learn more interesting techniques like the regexp tip you shared? I find
that studying other people's code is the best way to avoid getting in a
programming rut.

Thanks.

--
Robert

Jul 18 '05 #6
On Tue, 27 Jul 2004, Robert Oschler wrote:
Speaking of learning cool things by osmosis, do you know of a well commented
source of Python code, perhaps an Open Source project, that I could study to
learn more interesting techniques like the regexp tip you shared? I find
that studying other people's code is the best way to avoid getting in a
programming rut.


I seem to recall reading about that re.sub trick in something linked from
Pythonware's Daily Python URL (http://www.pythonware.com/daily/). There
are often links there to interesting and useful code snippets from
ActiveState's Python Cookbook and other sources; I'd say start there if
you want to find neat tricks you can do with Python.

I'm not sure of any particularly "well commented" Python projects though
(I've never really looked into that), but you'll probably find some
interesting small projects in the Vaults of Parnassus
(http://www.vex.net/parnassus/).

Jul 18 '05 #7
On Fri, 30 Jul 2004, Robert Oschler wrote:
With your Python skill you should work for Google. Too bad you don't,
you'd be a wealthy man soon (Google IPO). Wish I did. :)


Thanks for the compliment. :) To work at Google is my dream job, and I'm
sure that of many others on this list, too (makes me wonder if any Google
employees read this list...).

Jul 18 '05 #8

This discussion thread is closed

Replies have been disabled for this discussion.

Similar topics

4 posts views Thread by Geoff Wilkins | last post: by
7 posts views Thread by ian ward | last post: by
5 posts views Thread by Timothy Madden | last post: by
6 posts views Thread by clintonG | last post: by
6 posts views Thread by laredotornado | last post: by
reply views Thread by suresh191 | last post: by
1 post views Thread by Marylou17 | last post: by
1 post views Thread by Marylou17 | last post: by
By using this site, you agree to our Privacy Policy and Terms of Use.