Conventions Used in This Book
Here is a typical Code sample.
Example 1. Typical Python Example
combo = { }
for i in range(1,7):
for j in range(1,7):
roll= i+j
combo.setdefault( roll, 0 )
combo[roll] += 1
for n in range(2,13):
print "%d %.2f%%" % ( n, combo[n]/36.0 )
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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.
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This assures that the rolled number exists in the dictionary
with a default frequency count of 0.
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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.
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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.
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.
