Python处理HTML转义字符

抓网页数据经常遇到例如>或者 这种HTML转义符，抓到字符串里很是烦人。

比方说一个从网页中抓到的字符串

html = ‘<abc>‘

用Python可以这样处理：

import HTMLParser
html_parser = HTMLParser.HTMLParser()
txt = html_parser.unescape(html) #这样就得到了txt = ‘<abc>‘

如果还想转回去，可以这样：

import cgi
html = cgi.escape(txt) # 这样又回到了 html = ‘<abc&gt‘

 来回转的功能还分了两个模块实现，挺奇怪。没找到更优美的方法，欢迎补充哈~

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html的escape和unescape

http://stackoverflow.com/questions/275174/how-do-i-perform-html-decoding-encoding-using-python-django

For html encoding, there‘s cgi.escape from the standard library:

>> help(cgi.escape)
cgi.escape = escape(s, quote=None)
    Replace special characters "&", "<" and ">" to HTML-safe sequences.
    If the optional flag quote is true, the quotation mark character (")
    is also translated.
For html decoding, I use the following:

from htmlentitydefs import name2codepoint
# for some reason, python 2.5.2 doesn‘t have this one (apostrophe)
name2codepoint[‘#39‘] = 39

def unescape(s):
    "unescape HTML code refs; c.f. http://wiki.python.org/moin/EscapingHtml"
    return re.sub(‘&(%s);‘ % ‘|‘.join(name2codepoint),
              lambda m: unichr(name2codepoint[m.group(1)]), s)
For anything more complicated, I use BeautifulSoup.