Two dimensional array in python

Question

I want to know how to declare a two dimensional array in Python.

arr = [[]]

arr[0].append(\"aa1\")
arr[0].append(\"aa2\")
arr[1].append(\"bb1\")
arr[1].appe         


        

Answer 1

When constructing multi-dimensional lists in Python I usually use something similar to ThiefMaster's solution, but rather than appending items to index 0, then appending items to index 1, etc., I always use index -1 which is automatically the index of the last item in the array.

i.e.

arr = []

arr.append([])
arr[-1].append("aa1")
arr[-1].append("aa2")

arr.append([])
arr[-1].append("bb1")
arr[-1].append("bb2")
arr[-1].append("bb3")

will produce the 2D-array (actually a list of lists) you're after.