Two-dimensional arrays

[François Pinard]

[Peter Slizik]

> I created the 2-dim array using

>  >>> dim = 5
>  >>> array = [[0]*dim]*dim

> [...] I realised the problems is in references.  The 2-dim array doesn't
> consist of five 1-dim arrays, but of five references to the same array.

You might use:

   array = [[0]*dim for row in range(dim)]

if you want all rows to be distinct.  The general writing would be:

   array = [[0 for column in range(dim)] for row in range(dim)]

in which you may replace `0' by a function of column and row.

-- 
François Pinard   http://www.iro.umontreal.ca/~pinard