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<h3>Code Examples</h3>
<p>Next, you have some code examples that demonstrate the concepts illustrated by this chapter.</p>
<H4>
HTML Parsing Tool (File: <TT Class="monofont">parsing.py</TT>)</H4>
<P>We are going to use the <tt clASS="monofont">exchange.html</Tt> as the source of information for this program. The idea is to read the file, replace all the occurrences of the domain name <tt class="monofont"> "lessaworld"</tt> for <tt class="monofont">"bebemania",</tt> and add hyperlinks for all email and Web pages references that exist there.</p>
<H5>
Listing 9.1 File: <tt ClasS="monofont">exchange.html</tt>
</h5>
<pRe clASS="monofont">
<HTML>
<HEAD>
<TITLE>Exchange Rates Home Page</TITLE>
</HEAD>
<BODY>
<p align=justify>
<b>List of current files that we have available at this site:</b></p>
<br>
http://www.lessaworld.com/exchange/real.txt <br>
http://www.lessaworld.com/exchange/pound.txt <br>
http://www.lessaworld.com/exchange/dollar.txt <br><br>
Many people are currently working to keep these exchange rates updated.<br>
Andre (andre@bebemania.com.br) handles all the Brazilian Real operations,
meanwhile,Joao Pedro (jp@bebemania.com.br) takes care of pounds and
dollars.<br><br>
</BODY>
</HTML>
</Pre>
<p>The following code implements the parsing program.</p>
<H5>
Listing 9.2 File: <TT Class="monofont">parsing.py</TT>
</H5>
<Pre clASS="monofont">
1:
2: import re, sys
3:
4: TextOriginal = open("exchange.html").read()
5:
6: TextIn = re.sub("lessaworld", "bebemania", TextOriginal)
7:
8: operation_result = re.search(r'<title>(.*?)</title>', TextIn
,re.IGNORECASE)
9: if operation_result:
10: HTML_TITLE = operation_result.group(1)
11:
12: link_pattern = re.compile(r'((ftp|http)://[\w-]+(?:\.[\w-]+)*(?:/[\w-]*)*
(?:\.[\w-]*)*)')
13: links = re.findall(link_pattern, TextIn)
14: TextIn = re.sub(link_pattern, r"<a href=\1>\1</a>", TextIn)
15:
16: email_pattern = re.compile(r'([a-zA-Z][\w-]*@[\w-]+(?:\.[\w-]+)*)')
17: emails = re.findall(email_pattern, TextIn)
18: TextIn = re.sub(email_pattern, r"<a href=mailto:\1>\1</a>", TextIn)
19:
20: FileOut = open("newexchange.html", "w")
21: FileOut.write(TextIn)
22: FileOut.close()
23:
24: print '"%s" is done.'% (HTML_TITLE)
</Pre>
<p>Line 4: Opens and reads the original file.</p>
<p>Line 6: Replaces occurrences of <tt class="monofont">"lessaworld"</tt> with <tt clasS="monofont">"bebemania".</tt>
</P>
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