If I'm not mistaken, in python, there's no standard library to convert html entities, like & or > into their applicable characters.
htmlentitydefs provides maps that helps this conversion, but it's not a function so you have to write your own function make use of htmlentitydefs, probably using regex or something.
To me this seemed odd because python is known as 'Batteries Included' language.
So my questions are 1. Why doesn't python have/need entity encoding/decoding? 2. Is there any idiom to do entity encode/decode in python?
How strange that this doesn't appear in the Cookbook! I'm curious about how others think: does such an item better belong in the Cookbook, or the Wiki?
'&(%s);' won't quite work: HTML (and, I assume, SGML, but not XHTML being XML) allows you to skip the semicolon after the entity if it's followed by a white space (IIRC). Should this be respected, it looks more like this: r'&(%s)([;\s]|$)'
Also, this completely ignores non-name entities as also found in XML. (eg %x20; for ' ' or so) Maybe some part of the HTMLParser module is useful, I wouldn't know. IMHO, these particular batteries aren't too commonly needed.
A. I *think* you meant import re from htmlentitydefs import name2codepoint def htmlentitydecode(s): return re.sub('&(%s);' % '|'.join(name2codepoint), lambda m: chr(name2codepoint[m.group(1)]), s) We're stretching the limits of what's comfortable for me as a one-liner. B. How's it happen this isn't in the Cookbook? I'm curious about what other Pythoneers think: is this better memorialized in the Cookbook or the Wiki?
> If I'm not mistaken, in python, there's no standard library to convert > html entities, like & or > into their applicable characters.
> htmlentitydefs provides maps that helps this conversion, > but it's not a function so you have to write your own function > make use of htmlentitydefs, probably using regex or something.
> To me this seemed odd because python is known as > 'Batteries Included' language.
> So my questions are > 1. Why doesn't python have/need entity encoding/decoding? > 2. Is there any idiom to do entity encode/decode in python?
> Thank you in advance.
I think this is the standard idiom:
>>> import xml.sax.saxutils as saxutils >>> saxutils.escape("&") '&' >>> saxutils.unescape(">") '>' >>> saxutils.unescape("A bunch of text with entities: & > <")
'A bunch of text with entities: & > <'
Notice there is an optional parameter (a dict) that can be used to define additional entities as well.
> On Jun 4, 6:31 am, "js " <ebgs...@gmail.com> wrote: > > Hi list.
> > If I'm not mistaken, in python, there's no standard library to convert > > html entities, like & or > into their applicable characters.
> > htmlentitydefs provides maps that helps this conversion, > > but it's not a function so you have to write your own function > > make use of htmlentitydefs, probably using regex or something.
> > To me this seemed odd because python is known as > > 'Batteries Included' language.
> > So my questions are > > 1. Why doesn't python have/need entity encoding/decoding? > > 2. Is there any idiom to do entity encode/decode in python?
> > Thank you in advance.
> I think this is the standard idiom:
> >>> import xml.sax.saxutils as saxutils > >>> saxutils.escape("&") > '&' > >>> saxutils.unescape(">") > '>' > >>> saxutils.unescape("A bunch of text with entities: & > <") > 'A bunch of text with entities: & > <'
> Notice there is an optional parameter (a dict) that can be used to > define additional entities as well.
Matimus <mccre...@gmail.com> wrote: >On Jun 4, 6:31 am, "js " <ebgs...@gmail.com> wrote: >> Hi list.
>> If I'm not mistaken, in python, there's no standard library to convert >> html entities, like & or > into their applicable characters.
>> htmlentitydefs provides maps that helps this conversion, >> but it's not a function so you have to write your own function >> make use of htmlentitydefs, probably using regex or something.
>> To me this seemed odd because python is known as >> 'Batteries Included' language.
>> So my questions are >> 1. Why doesn't python have/need entity encoding/decoding? >> 2. Is there any idiom to do entity encode/decode in python?
>> Thank you in advance.
>I think this is the standard idiom:
>>>> import xml.sax.saxutils as saxutils >>>> saxutils.escape("&") >'&' >>>> saxutils.unescape(">") >'>' >>>> saxutils.unescape("A bunch of text with entities: & > <") >'A bunch of text with entities: & > <'
>Notice there is an optional parameter (a dict) that can be used to >define additional entities as well.
. . . Good points; I like your mention of the optional entity dictionary.
It's possible that your solution is to a different problem than the original poster intended. <URL: http://wiki.python.org/moin/EscapingHtml > has de- tails about HTML entities vs. XML entities.
"Thomas Jollans" <tho...@jollans.NOSPAM.com> writes: > "Adam Atlas" <a...@atlas.st> wrote in message > news:1180965792.757685.132580@q75g2000hsh.googlegroups.com... > > As far as I know, there isn't a standard idiom to do this, but it's > > still a one-liner. Untested, but I think this should work:
> '&(%s);' won't quite work: HTML (and, I assume, SGML, but not XHTML being > XML) allows you to skip the semicolon after the entity if it's followed by a > white space (IIRC). Should this be respected, it looks more like this: > r'&(%s)([;\s]|$)'
> Also, this completely ignores non-name entities as also found in XML. (eg > %x20; for ' ' or so) Maybe some part of the HTMLParser module is useful, I > wouldn't know. IMHO, these particular batteries aren't too commonly needed.
Here's one that handles numeric character references, and chooses to leave entity references that are not defined in standard library module htmlentitydefs intact, rather than throwing an exception.
It ignores the missing semicolon issue (and note also that IE can cope with even a missing space, like "trés mal", so you'll see that in the wild). Probably it could be adapted to handle that (possibly the presumably-slower htmllib-based recipe on the python.org wiki already does handle that, not sure).
import htmlentitydefs import re import unittest
def unescape_charref(ref): name = ref[2:-1] base = 10 if name.startswith("x"): name = name[1:] base = 16 return unichr(int(name, base))
def replace_entities(match): ent = match.group() if ent[1] == "#": return unescape_charref(ent)
repl = htmlentitydefs.name2codepoint.get(ent[1:-1]) if repl is not None: repl = unichr(repl) else: repl = ent return repl
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