>>> def foo(src, n):

... res = []

... [[res.append(e) for e in src] for _ in range(n)]

... return res

>>> foo(['a', 'b', 'c'], 3)

['a', 'b', 'c', 'a', 'b', 'c', 'a', 'b', 'c']


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

>>> n = 3

>>> [e for _ in range(n) for e in a]

['a', 'b', 'c', 'a', 'b', 'c', 'a', 'b', 'c']


더 간단하게도 되네