python - Why KeyError: 0

Question

I'm attempting to solve Project Euler 21 but I'm getting KeyError: 0 which normally occurs when you refer to a dictionary key that doesn't exist. However, I thought I had solved that problem with the < 10000 condition. The error refers to the first 'if' statement in the main() function.

sumsdivs = {}
for i in range(1, 10000):
    tmpls = []
    for j in range(1, i):
        if i % j == 0:
            tmpls.append(j)
    sumsdivs[i] = sum(tmpls)

amls = []
def main():
    for i in range(1, 10000):
        if sumsdivs[i] < 10000 and sumsdivs[i] == sumsdivs[sumsdivs[i]]:
            if sumsdivs[i] not in amls:
                amls.append(sumsdivs[i])
            if sumsdivs[sumsdivs[i]] not in amls:
                amls.append(sumsdivs[sumsdivs[i]])
    return sum(amls)

print(main())

Any ideas?

Answer 1

0你在这里插入i = 1：

sumsdivs = {}
for i in range(1, 10000):
    tmpls = []
    for j in range(1, i):
        if i % j == 0:
            tmpls.append(j)
    sumsdivs[i] = sum(tmpls)

内部循环永远不会运行（range(1, 1)为空），并且sum([])为 0。

演示：

>>> sumsdivs = {}
>>> for i in range(1, 2):
...     tmpls = []
...     for j in range(1, i):
...         if i % j == 0:
...             tmpls.append(j)
...     sumsdivs[i] = sum(tmpls)
... 
>>> sumsdivs
{1: 0}
>>> sum([])
0    

0 也是如此sumsdivs[1]，并sumsdivs[sumsdivs[0]]抛出一个KeyError：

>>> sumsdivs[sumsdivs[1]]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyError: 0