On 5/9/2011 8:44 PM, Algis Kabaila wrote:
The method of double indexing in the manner
a[i][j]
for the (i, j) -th element of multi-dimensional array is well known and
widely used. But how to enable the "standard" matrix notation
a[i, j]
in Python 3.2 in the manner of numpy (and other matrix packages)? Is it
subclassing of "special methods"
__getitem__() # to get
__setitem__() # to set
Yes.
class listwrap:
def __init__(self, lis):
self._list = lis
def __getitem__(self, dex):
i,j = dex
return self._list[i][j]
# __setitem__: exercise for reader
l = listwrap([[1,2,3],['a','b','c']])
print(l[0,2],l[1,0])
# 3 a
IMO, Hardly worth it for two dimensions.
--
Terry Jan Reedy
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