Use lists unless you want some very specific features that are in the C array libraries.
python really has three primitive data structures
tuple = ('a','b','c')
list = ['a','b','c']
dict = {'a':1, 'b': true, 'c': "name"}
list.append('d') #will add 'd' to the list
list[0] #will get the first item 'a'
list.insert(i, x) # Insert an item at a given position. The first argument is the index of the element before which to insert, so a.insert(0, x) inserts at the front of the list, and a.insert(len(a), x) is equivalent to a.append(x).
list.pop(2) # will remove items by position (index), remove the 3rd item
list.remove(x) # Remove the first item from the list whose value is x.
list.index(x) # Return the index in the list of the first item whose value is x. It is an error if there is no such item.
list.count(x) # Return the number of times x appears in the list.
list.sort(cmp=None, key=None, reverse=False) # Sort the items of the list in place (the arguments can be used for sort customization, see sorted() for their explanation).
list.reverse() # Reverse the elements of the list, in place.
More on data structures here: http://docs.python.org/tutorial/datastructures.html