Professional IronPython

using Custom objects in IronPython
At this point, you have a shiny new class named 
MyGreetings
. Normally, you won’t place the class 
and the code that uses it in the same file, so the example places the test code in 
TestFirstClass.py
. 
Consequently, the first thing the example does is import 
MyGreetings
from 
FirstClass
, as shown 
in Listing 5-2.
lISTINg 5-2: 
 Testing the simple class
from FirstClass import MyGreetings
# Create an instance of the class.
TestIt = MyGreetings() 
# Set the Name attribute.
TestIt.Name = ‘George’
# Call the two methods.
TestIt.SayHello()
TestIt.SayGoodbye() 
# Pause after the debug session.
raw_input(‘Press any key to continue...’)
At this point, the code creates an instance of 
MyGreetings
and places it in 
TestIt
. Notice that the 
call to 
MyGreetings
doesn’t require any data. If you want to request data from the caller during 
instantiation, you must provide an 
__init__()
method in your class declaration. Otherwise, the 
interpreter provides a default declaration for you that creates the desired object.
The code changes the value of 
Name
by assigning a new value to it. Notice that you assign the new 
value to 
TestIt.Name
, just as you would in any other language.
Next, the code calls the two methods, 
SayHello()
and 
SayGoodbye()
. Notice that the method calls 
don’t require any input, and IronPython would complain if you tried to provide it. Remember that 
the interpreter provides 
self
in the background. Figure 5-2 shows the output from this application.
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2/24/10 1:21:50 PM
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