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

Before list comprehensions and generators were invented/became widespread, people used to think much simpler¹:

>>> a = ['a', 'b', 'c']
>>> b = []
>>> for x in a: b.extend([x, x+'_ind'])
... 
>>> b
['a', 'a_ind', 'b', 'b_ind', 'c', 'c_ind']

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^* I don't mean that those constructs/tools are evil, just wanted to point out that there is a simple solution.