Pythonicに sum of square を返す表現の歴史を振り返る

History of sum of square

1990: Basic Python

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

2000: List Comprehensions

PEP202

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

2001: Generators

PEP255

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

2004: Generator Expressions

PEP289

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