How do I unescape HTML entities in a string in Python 3.1? [duplicate]

问题

I have looked all around and only found solutions for python 2.6 and earlier, NOTHING on how to do this in python 3.X. (I only have access to Win7 box.)

I HAVE to be able to do this in 3.1 and preferably without external libraries. Currently, I have httplib2 installed and access to command-prompt curl (that\'s how I\'m getting the source code for pages). Unfortunately, curl does not decode html entities, as far as I know, I couldn\'t find a command to decode it in the documentation.

YES, I\'ve tried to get Beautiful Soup to work, MANY TIMES without success in 3.X. If you could provide EXPLICIT instructions on how to get it to work in python 3 in MS Windows environment, I would be very grateful.

So, to be clear, I need to turn strings like this: Suzy & John into a string like this: \"Suzy & John\".

回答1:

You could use the function html.unescape:

In Python3.4+ (thanks to J.F. Sebastian for the update):

import html
html.unescape('Suzy &amp; John')
# 'Suzy & John'

html.unescape('&quot;')
# '"'

In Python3.3 or older:

import html.parser    
html.parser.HTMLParser().unescape('Suzy &amp; John')

In Python2:

import HTMLParser
HTMLParser.HTMLParser().unescape('Suzy &amp; John')

回答2:

You can use xml.sax.saxutils.unescape for this purpose. This module is included in the Python standard library, and is portable between Python 2.x and Python 3.x.

>>> import xml.sax.saxutils as saxutils
>>> saxutils.unescape("Suzy &amp; John")
'Suzy & John'

回答3:

Apparently I don't have a high enough reputation to do anything but post this. unutbu's answer does not unescape quotations. The only thing that I found that did was this function:

import re
from htmlentitydefs import name2codepoint as n2cp

def decodeHtmlentities(string):
    def substitute_entity(match):        
        ent = match.group(2)
        if match.group(1) == "#":
            return unichr(int(ent))
        else:
            cp = n2cp.get(ent)
            if cp:
                return unichr(cp)
            else:
                return match.group()
    entity_re = re.compile("&(#?)(\d{1,5}|\w{1,8});")
    return entity_re.subn(substitute_entity, string)[0]

Which I got from this page.

回答4:

Python 3.x has html.entities too

回答5:

In my case I have a html string escaped in as3 escape function. After a hour of googling haven't found anything useful so I wrote this recusrive function to serve for my needs. Here it is,

def unescape(string):
    index = string.find("%")
    if index == -1:
        return string
    else:
        #if it is escaped unicode character do different decoding
        if string[index+1:index+2] == 'u':
            replace_with = ("\\"+string[index+1:index+6]).decode('unicode_escape')
            string = string.replace(string[index:index+6],replace_with)
        else:
            replace_with = string[index+1:index+3].decode('hex')
            string = string.replace(string[index:index+3],replace_with)
        return unescape(string)

Edit-1 Added functionality to handle unicode characters.

回答6:

I am not sure if this is a built in library or not but it looks like what you need and supports 3.1.

From: http://docs.python.org/3.1/library/xml.sax.utils.html?highlight=html%20unescape

xml.sax.saxutils.unescape(data, entities={}) Unescape '&', '<', and '>' in a string of data.

来源：https://stackoverflow.com/questions/2360598/how-do-i-unescape-html-entities-in-a-string-in-python-3-1

标签

python

html

curl

python-3.x

entities