# 0203.py

a=[n*n for n in xrange(8)]
print a
# [0, 1, 4, 9, 16, 25, 36, 49]

a=(n*n for n in xrange(8))
print a
# <generator object at 0x596e4c>

for k in xrange(4): print a.next(),
# 0 1 4 9