Newbie: How do I implement an 2 element integer array in Python.?
sholden at holdenweb.com
Wed Oct 11 16:37:38 CEST 2000
jbranthoover at my-deja.com wrote:
> Hello All,
> What is the syntax for creating a 2 element integer array? I
> have looked at the Array Module documentation, but I am afraid that I
> dont quite understand it. In Basic I would do something like:
> Dim MyArray(100,16)
Well, forst of all, a two-element array would be declared as
What you want is a two-dimensional array!
> For i = 0 to 100
> For j = 0 to 16
> MyArray( i,j ) = MyData
> Next j
> Next i
> Can someone out there give me a quick example of how this
> function is done in Python? Thank you for you time and have a nice day.
A simple approach would be:
twod =  # construct empty list
for i in range(100): # for each row
twod.append() # append an empty column list
for j in range(16): # for each column
twod[i].append(myData) # append data for this row/column
However, your elements would have to be accessed as
Builtin functions to construct empty lists of arbitrary size might
save time, space and garbage collection, but a recent discussion
twod = [ ([] * 16) ] * 100
would not work. Essentially, elements end up pointing to the
same data item, and changing an element changes other elements!
>>> arr = [ ([] * 2) ] * 3
[[, ], [, ], [, ]]
>>> arr = "spam"
[['spam', ], ['spam', ], ['spam', ]]
Helping people meet their information needs with training and technology.
703 967 0887 sholden at bellatlantic.net http://www.holdenweb.com/
More information about the Python-list