用python處理html代碼的轉義與還原

2019-11-14 17:21:40

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用python處理html代碼的轉義與還原

轉義 escape:

import cgi

s = cgi.escape("""& < >""") # s = '& < >'

反轉義 unescape:

#使用標準庫

from htmllib import HTMLParser

h = HTMLparser.HTMLParser()

s = h.unescape('& < >') # s = u'& < >'

#使用BeautifulSoup

from bs4 import BeautifulSoup

soup = BeautifulSoup(html, /

convertEntities=BeautifulSoup.HTML_ENTITIES)

引用于:

http://fredericiana.com/2010/10/08/decoding-html-entities-to-text-in-python/

https://wiki.python.org/moin/EscapingHtml

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Python處理HTML轉義字符

抓網頁數據經常遇到例如>或者 這種HTML轉義符，抓到字符串里很是煩人。

比方說一個從網頁中抓到的字符串

html = '&lt;abc&gt;'

用Python可以這樣處理：

import HTMLParserhtml_parser = HTMLParser.HTMLParser()txt = html_parser.unescape(html) #這樣就得到了txt = '<abc>'

如果還想轉回去，可以這樣：

import cgihtml = cgi.escape(txt) # 這樣又回到了 html = '&lt;abc&gt'

來回轉的功能還分了兩個模塊實現，挺奇怪。沒找到更優美的方法，歡迎補充哈~

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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.

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