HTMLParser.HTMLParser().unescape() doesn't work

问题

I would like to convert HTML entities back to its human readable format, e.g. '£' to '£', '°' to '°' etc.

I've read several posts regarding this question

Converting html source content into readable format with Python 2.x

Decode HTML entities in Python string?

Convert XML/HTML Entities into Unicode String in Python

and according to them, I chose to use the undocumented function unescape(), but it doesn't work for me...

My code sample is like:

import HTMLParser

htmlParser = HTMLParser.HTMLParser()
decoded = htmlParser.unescape('&copy; 2013')
print decoded

When I ran this python script, the output is still:

&copy; 2013

instead of

© 2013

I'm using Python 2.X, working on Windows 7 and Cygwin console. I googled and didn't find any similar problems..Could anyone help me with this?

回答1:

Apparently HTMLParser.unescape was a bit more primitive before Python 2.6.

Python 2.5:

>>> import HTMLParser
>>> HTMLParser.HTMLParser().unescape('&copy;')
'&copy;'

Python 2.6/2.7:

>>> import HTMLParser
>>> HTMLParser.HTMLParser().unescape('&copy;')
u'\xa9'

See the 2.5 implementation vs the 2.6 implementation / 2.7 implementation

回答2:

This site lists some solutions, here's one of them:

from xml.sax.saxutils import escape, unescape

html_escape_table = {
    '"': "&quot;",
    "'": "&apos;",
    "©": "&copy;"
    # etc...
}
html_unescape_table = {v:k for k, v in html_escape_table.items()}

def html_unescape(text):
    return unescape(text, html_unescape_table)

Not the prettiest thing though, since you would have to list each escaped symbol manually.

EDIT:

How about this?

import htmllib

def unescape(s):
    p = htmllib.HTMLParser(None)
    p.save_bgn()
    p.feed(s)
    return p.save_end()

来源：https://stackoverflow.com/questions/17751439/htmlparser-htmlparser-unescape-doesnt-work

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