convert loop to list comprehension

[bearophileHUGS at lycos.com]

Two possibile solutions:

seq = [2, 3, 1, 9]

print sum( ([i]*n for i,n in enumerate(seq)), [])

print [i for i, x in enumerate(seq) for _ in xrange(x)]

The second one is probably quite faster.

Bye,
bearophile