List with duplicated values and suffix

Question

I have a list, a:

a = [\'a\',\'b\',\'c\']

and need to duplicate some values with the suffix _ind added this way (

Answer 1

Another alternative with splicing (Python2.x, 3.x):

result = [None] * len(a) * 2
result[::2], result[1::2] = a, map(lambda x: x + '_ind', a)

result
# ['a', 'a_ind', 'b', 'b_ind', 'c', 'c_ind']