What you show, ('A','B','C','D','E')is not list, it is a tuple(parentheses instead of square brackets show this). However, whether you need to index the list or tuple (to get one item in the index), in any case you add the index in square brackets.
So:
thetuple = ('A','B','C','D','E')
print thetuple[0]
A ..
( ) , thetuple[0] .. ( ). ( "" ) .