为什么只循环了一次？
def square_of_sum(L):
sum = 0
for a in L:
a = a * a
sum = sum + a
return sum
print square_of_sum([1, 2, 3, 4, 5])
print square_of_sum([-5, 0, 5, 15, 25])
输出结果是1 和 25，为什么只循环了一次？
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def square_of_sum(L):
sum = 0
for a in L:
a = a * a
sum = sum + a
return sum
print square_of_sum([1, 2, 3, 4, 5])
print square_of_sum([-5, 0, 5, 15, 25])
输出结果是1 和 25，为什么只循环了一次？
2019-10-31
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