Examples of using the html parser

[Boogie El Aceitoso]

Hi,

Were can I find examples of the usege of the html parser class?

 

[Miki Tebeka]

Hello Boogie,

Were can I find examples of the usege of the html parser class?

Here is what I do to find the current price of a quote in Yahoo!
class Parser(HTMLParser):
'''HTML Parser to get quote value'''
def __init__(self, quote):
HTMLParser.__init__(self)
self.state = "START"
self.value = ERR_VALUE
self.quote = quote.upper()

def handle_starttag(self, tag, attrs):
'''Handle start tag'''
if self.state == "AFTER_START" and tag == "b":
self.state = "GET"

def handle_data(self, data):
'''Handle tag data'''
if self.state == "START" and data == "Last Trade:":
self.state = "AFTER_START"
elif self.state == "GET":
try:
self.value = float(data)
except ValueError:
self.value = ERR_VALUE
self.state = "DONE"

def get_quote(quote):
'''Get quote prices'''
p = Parser(quote)
p.feed(urlopen("http://finance.yahoo.com/q?s=%s" %
quote.upper()).read())
return p.value


HTH.
Miki

 

[Ng Pheng Siong]

Were can I find examples of the usege of the html parser class?

M2Crypto has an example in demo/ssl/sess.py. Here's the docstring:

"""M2Crypto.SSL.Session client demo: This program requests a URL from
a HTTPS server, saves the negotiated SSL session id, parses the HTML
returned by the server, then requests each HREF in a separate thread
using the saved SSL session id."""

Note that the code simply instantiates a parser and feeds it the HTML; it
doesn't apply any parsing-related callback.

 

[max khesin]

There are well-explained examples on www.diveintopython.org
max.

 

[John J. Lee]

Were can I find examples of the usege of the html parser class?

Simpler to use, for simple cases:

http://wwwsearch.sf.net/pullparser/


Note that the example in the tarball that does something like

try:
parser.get_compressed_text(endat=("endtag", "a"))
except NoMoreTokensError:
...

Is out of date: .get_text() and .get_compressed_text() now return an
empty string instead.


John