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Conventions Used in This Book
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Conventions Used in This Book

Here is a typical Code sample.

Example 1. Typical Python Example

combo = { } 
1

for i in range(1,7):
 for j in range(1,7):
 roll= i+j
 combo.setdefault( roll, 0 ) 
2

 combo[roll] += 1
for n in range(2,13):
 print "%d %.2f%%" % ( n, combo[n]/36.0 ) 
3

1	This creates a Python dictionary, a map from key to value. If we initialize it with something like the following: `combo = dict( [ (n,0) for n in range(2,13) ] )`, we don't need the `setdefault` function call below.
2	This assures that the rolled number exists in the dictionary with a default frequency count of 0.
3	Print each member of the resulting dictionary. Something more obscure like `[ (n,combo[n]/36.0) for n in range(2,13)]` is certainly possible.

The output from the above program will be shown as follows:

2 0.03%
3 0.06%
4 0.08%
5 0.11%
6 0.14%
7 0.17%
8 0.14%
9 0.11%
10 0.08%
11 0.06%
12 0.03%
Tool completed successfully

We will use the following type styles for references to a specific Class, method function, attribute, which includes both class variables or instance variables.

Sidebars

When we do have a significant digression, it will appear in a sidebar, like this.

Tip

There will be design tips, and warnings, in the material for each exercise. These reflect considerations and lessons learned that aren't typically clear to starting OO designers.

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