Python code - 4 lines

Link:

Python, pasted on Sep 4:

from operator import add
print reduce(add, ('a', 'b', 'c', 'd')) 
print reduce(add, (1, 2, 3, 4, 5))
print reduce(add, ([1, 2,], [3, 4], [5]))

Output:

1
2
3

abcd
15
[1, 2, 3, 4, 5]