Python BeautifulSoup XML Parsing

Question

I've written a simple script to parse XML chat logs using the BeautifulSoup module. The standard soup.prettify() works ok except chat logs have a lot of fluff in them. You can see both the script code and some of the XML input file I'm working with below:

Code

import sys from BeautifulSoup import BeautifulSoup as Soup  def parseLog(file):     file = sys.argv[1]     handler = open(file).read()     soup = Soup(handler)     print soup.prettify()  if __name__ == "__main__":     parseLog(sys.argv[1]) 

Test XML Input

<?xml version="1.0"?> <?xml-stylesheet type='text/xsl' href='MessageLog.xsl'?> <Log FirstSessionID="1" LastSessionID="2"><Message Date="10/31/2010" Time="3:43:48 PM"     DateTime="2010-10-31T20:43:48.937Z" SessionID="1"><From><User FriendlyName="Jon"/></From>    <To><User FriendlyName="Bill"/></To><Text Style="font-family:Segoe UI; color:#000000; ">hey, what's up?</Text></Message> <Message Date="10/31/2010" Time="3:44:03 PM" DateTime="2010-10-15T20:44:03.421Z" SessionID="1"><From><User FriendlyName="Jon"/></From><To><User FriendlyName="Bill"/></To><Text Style="font-family:Segoe UI; color:#000000; ">Got your message</Text></Message>  <Message Date="10/31/2010" Time="3:44:31 PM" DateTime="2010-10-15T20:44:31.390Z" SessionID="2"><From><User FriendlyName="Bill"/></From><To><User FriendlyName="Jon"/></To><Text Style="font-family:Segoe UI; color:#000000; ">oh, great</Text></Message> <Message Date="10/31/2010" Time="3:44:59 PM" DateTime="2010-10-15T20:44:59.281Z" SessionID="2"><From><User FriendlyName="Bill"/></From><To><User FriendlyName="Jon"/></To><Text Style="font-family:Segoe UI; color:#000000; ">hey, i gotta run</Text></Message> 

I'm wanting to be able to output this into a format like the following or at least something that is more readable than pure XML:

Jon: Hey, what's up? [10/31/10 @ 3:43p]

Jon: Got your message [10/31/10 @ 3:44p]

Bill: oh, great [10/31/10 @ 3:44p]

etc.. I've heard some decent things about the PyParsing module, maybe it's time to give it a shot.

Answer 1

BeautifulSoup makes getting at attributes and values in xml really simple. I tweaked your example function to use these features.

import sys from BeautifulSoup import BeautifulSoup as Soup  def parseLog(file):     file = sys.argv[1]     handler = open(file).read()     soup = Soup(handler)     for message in soup.findAll('message'):         msg_attrs = dict(message.attrs)         f_user = message.find('from').user         f_user_dict = dict(f_user.attrs)         print "%s: %s [%s @ %s]" % (f_user_dict[u'friendlyname'],                                     message.find('text').decodeContents(),                                     msg_attrs[u'date'],                                     msg_attrs[u'time'])   if __name__ == "__main__":     parseLog(sys.argv[1]) 

Answer 2

I'd recommend using the builtin ElementTree module. BeautifulSoup is meant to handle unwell-formed code like hacked up HTML, whereas XML is well-formed and meant to be read by an XML library.

Update: some of my recent reading here suggests lxml as a library built on and enhancing the standard ElementTree.