Looking back on the history of expressions that return sum of square to Pythonic

result = []
for i in range(n):
    s = i * i
    result.append(s)
print sum(result)

print sum([i * i for i in range(n)])

def squares(n):
    for i in xrange(n):
        s = i * i
        yield s
print sum(squares(n))

print sum(i * i for i in xrange(n))

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