Pythonicに sum of square を返す表現の歴史を振り返る ref: http://qiita.com/giwa/items/ed40135be78cede1af26

file0.txt

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

file1.txt

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

file2.txt

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

file3.txt

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