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<table width="100%" cellpadding=5 cellspacing=0 border=0 class="navtopbg"><tr><td><font size="1"><p class="navtitle"><a href="8.html" class="navtitle">Web Development</a> &gt; <a href="0672319942.html" class="navtitle">Python Developer's Handbook</a> &gt; <a href="102.html" class="navtitle">5. Object-Oriented Programming</a> &gt; <span class="nonavtitle">Code Examples</span></p></font></td><td align="right" valign="top" nowrap><font size="1"><a href="main.asp?list" class="safnavoff">See All Titles</a></font></td></tr></table>
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<TABLE border=0 width="100%" cellspacing=0 cellpadding=0><TR><td align=left width="15%" class="headingsubbarbg"><a href="113.html" title="Summary"><font size="1">&lt;&nbsp;BACK</font></a></td><td align=center width="70%" class="headingsubbarbg"><font size="1"><a href="popanote.asp?pubui=oreilly&bookname=0672319942&snode=114" target="_blank" title="Make a public or private annnotation">Make Note</a> | <a href="114.html" title="Use a Safari bookmark to remember this section">Bookmark</a></font></td><td align=right width="15%" class="headingsubbarbg"><a href="116.html" title="II: Advanced Programming"><font size="1">CONTINUE&nbsp;&gt;</font></a></td></TR></TABLE>
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<FONT><h3>Code Examples</h3>
				<p>This application subclasses an exception class and executes the commands stored in a file. The filename is asked by the application.</p>

				
					<H5>
Listing 5.1 Configuration File (File configfile.py)</H5>
					<PRe claSS="monofont">
 1: ###
 2: # Program: Configuration File
 3: # Author:  Andre S Lessa
 4: ###
 5:
 6: ### import modules
 7:
 8: import exceptions, sys
 9:
10: configfile = raw_input("Configuration File: ")
11:
12: class ConfigError (exceptions.Exception):
13:     def __init__(self, arg=None):
14:         self.args = arg
15:
16: try:
17:     try:
18:         file = open(configfile)
19:         lines = file.readlines()
20:     finally:
21:         file.close()
22: except:
23:     print "Error. Invalid file name."
24:     sys.exit()
25:
26: lines[0] = lines[0][:-1]
27:
28: if lines[0] != "CFG2000":
29:     raise ConfigError, "Invalid header."
30:
31: lines = lines[1:]
32:
33: for line in lines:
34:     try:
35:         exec line
36:     except LookupError, b:
37:         if b.args[0] == "list index out of range":
38:             print "Error. Invalid index entry"
39:         else:
40:             print "Error. Generic LookupError entry"
41:     except SystemExit:
42:         print "Error. sys.exit() cannot be used."
</PRe>
				
				<p>Lines 12-14: The class <tt CLASs="monofont">ConfigError</tt> is created. It inherits all the attributes from the <tt class="monofont">exceptions.Exception</tt> class.</p>

				<p>Line 29: Raises our new exception class.</p>

				<p>In order to test this program, we have to create a file called <tt clAss="monofont">config.txt</Tt> that contains the following lines:</p>

				<pRe>
					
CFG2000
print
print "Configuration File"
print "------------------"
server = "SRV001"
port = 80
print "Server: ", server
print "Port:   ", port

				</pre>

				<P>The next interaction shows how to call the program. It also shows the results provided by the program when no exception is raised.</p>

				<prE>
					
C:\  Python&gt;python configfile.py
Configuration File: config.txt

Configuration File
------------------
Server:  SRV001
Port:    80

C:\ Program Files\ Python&gt;

				</PRE>

				<p>This simple program creates a class structure that stores and prints a list of groceries.</p>

				
					<h5>
Listing 5.2 Groceries List (File groceries.py)</h5>
					<PRE Class="monofont">
 1: ###
 2: # Program: Groceries List
 3: # Author:  Andre S Lessa
 4: ###
 5:
 6: ### import modules
 7:
 8:
 9: class grocery:
10:     "Items that you need to buy at the grocery store."
11:     def __init__(self, name, quantity=1):
12:         self.name = name
13:         self.quantity = quantity
14:
15: items = {
 
}
16: print "Type ENTER when you are done."
17: while 1:
18:     name = raw_input("Grocery name: ")
19:     if name == "":
20:         break
21:     quantity = raw_input("%s quantity: " % (name))
22:     if quantity == "":
23:         items[name] = grocery(name)
24:     else:
25:         items[name] = grocery(name,quantity)
26:
27: print "------------------------\ nList of groceries to buy"
28: print "------------------------"
29:
30: for item in items.keys():
31:     print "Grocery : ", items[item].name,
32:     print "\ tQuantity: ", items[item].quantity
33:
34: print "---------"
</PRE>
				
				<P>Line 9: Declares the <tt clASS="monofont">grocery</Tt> class.</p>

				<p>Line 10: The class's documentation text.</p>

				<p>Line 11: A default value is defined for the <tt class="monofont">quantity</tt> argument.</p>

				<p>Lines 22-25: Uses a different interface to initialize the object, depending on the information provided.</p>

				<p>Lines 31-32: Provides access to the object attributes.</p>

				<p>The next interaction shows how the program works.</P>

				<prE>
					
C:\ Python&gt;python groceries.py
Type ENTER when you are done.
Grocery name: bananas
bananas quantity: 12
Grocery name: apples
apples quantity: 6
Grocery name: pears
pears quantity: 8
Grocery name: pineapple
pineapple quantity:
Grocery name:
------------------------
List of groceries to buy
------------------------
Grocery :  pineapple    Quantity:  1
Grocery :  pears        Quantity:  8
Grocery :  apples       Quantity:  6
Grocery :  bananas      Quantity:  12
---------

C:\ Python&gt;

				</pre>

				<P>This file introduces two classes and one function that extensively manipulate class methods and attributes.</p>

				
					<h5>
Listing 5.3 Company employees (File company.py)</h5>
					<pRe clASS="monofont">
 1: ###
 2: # Program: Company employees
 3: # Author:  Andre S Lessa
 4: ###
 5:
 6: ### import modules
 7:
 8: import types
 9:
10: class Employee:
11:     "Generic class for all company employees"
12:
13:     __employees = 0
14:
15:     def __init__(self,name,salary=500.00):
16:         self.name = name
17:         self.salary = salary
18:         self.family = []
19:         Employee.__employees = Employee.__employees + 1
20:
21:     def __str__(self):
22:         return "employee: %s" % self.name
23:
24:     def raisesalary(self, percent):
25:         self.salary = self.salary + (self.salary * (1.0/percent))
26:
27:     def job(self):
28:         print self.name, "writes Python code."
29:
30:     def hasfamily(self):
31:         return len(self.family) &gt; 0
32:
33:     def addmember(self, name):
34:         self.family.append(name)
35:
36:     def removemember(self, arg):
37:         if len(self.family) &gt; 0:
38:             if type(arg) == type(1):
39:                 self.removemember_int(arg)
40:             elif isinstance(arg, types.StringType):
41:                 self.removemember_str(arg)
42:
43:     def removemember_int(self, index):
44:         member = self.family[index]
45:         del self.family[index]
46:         return member
47:
48:     def removemember_str(self, name):
49:         for member in self.family:
50:             if member == name:
51:                 del self.family[self.family.index(member)]
52:                 return member
53:
54:     def __getitem__(self, index):
55:         member = self.family[index]
56:         return member
57:
58: class Leader(Employee):
59:     "Company's Leader of the employees"
60:     def __init__ (self, name):
61:         Employee.__init__ (self, name, 1500.00)
62:     def job(self):
63:         print self.name, "supervises who writes Python code."
64:
65: def totalemployee():
66:     return  Employee._employee_employees
</Pre>
				
				<p>Line 10: Defines the <tT CLAss="monofont">Employee</tt> class.</P>

				<P>Line 13: Class variable <TT clasS="monofont">__employees.</TT></P>

				<p>Line 19: Increments the number of employees.</p>

				<p>Line 31: Returns a logical value (<tt class="monofont">0</tt> or <tt class="monofont">1</tT>).</p>

				<p>Lines 36-41: Implements polymorphism by enabling the user to enter both string and integer values.</P>

				<p>Lines 43-52: Helper methods for the polymorphism implementation.</p>

				<p>Line 54: Enables the slicing of employees instances.<A name="idx1073743522"></A><a naME="idx1073743523"></A><A name="idx1073743524"></A><A NAme="idx1073743525"></a><a NAME="idx1073743526"></a></p>

				<p>Line 58: Defines a subclass Leader that inherits attributes from the <tT CLAss="monofont">Employee</tt> class.</p>

				<p>Lines 60-63: The <tt class="monofont">__init__()</tt> and the <tt claSs="monofont">job()</tT> methods are overwritten.</p>

				<p>Line 65: Provides a function that returns the total number of employees who are currently part of the class.</p>

				<P>The following interaction shows how the classes must be used.</p>

				<pre>
					
&gt;&gt;&gt; import company
&gt;&gt;&gt; andre = company.employee("Andre") # Creates an employee instance
&gt;&gt;&gt; print andre
emplo
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