# 1611.py

a=('Roma','Pisa','Milano','Trento')
print [x[0] for x in a]
# ['R', 'P', 'M', 'T']

a=[x*x+3 for x in xrange(8)]
print a
# [3, 4, 7, 12, 19, 28, 39, 52]

a=[x+y for x,y in (3,2),(5,6),(1,9)]
print a
# [5, 11, 10]