Re: 2D array

[Steven Bethard]

Adam DePrince wrote:
If your data is sparse you might want to consider using a dictionary
where the key is a tuple representing the coordinates.
a = {}
a[(0,0)] = 0
a[(0,1)] = 1
[snip]
print a.get( (5,0), None )
Good point.  Note that you don't need the parentheses in the assignments 
or item accesses:

>>> a = {}
>>> a[0,0] = 10
>>> a[0,0]
10
Also note that you don't need to specify None as the default value when 
you call dict.get -- None is assumed if no default value is supplied:

>>> print a.get((5, 2))
None
Steve
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