感谢出色的Cristian Ciupitu，我的最终解决方案行之有效。
x = input()
NUM_LETTERS = 26 #Can't import modules I'm using a web based grader/compiler
def SpyCoder(S, N):
y = ""
for i in S:
if(i.isupper()):
x = ord(i)
x += N
if x > ord('Z'):
x -= NUM_LETTERS
elif x < ord('A'):
x += NUM_LETTERS
y += chr(x)
else:
y += " "
return y
def GoodnessFinder(S):
y = 0
for i in S:
if i.isupper():
x = ord(i)
x -= ord('A')
y += letterGoodness[x]
else:
y += 1
return y
def GoodnessComparer(S):
goodnesstocompare = GoodnessFinder(S)
goodness = 0
v = ''
best_v = S
for i in range(0, 26):
v = SpyCoder(S, i)
goodness = GoodnessFinder(v)
if goodness > goodnesstocompare:
best_v = v
goodnesstocompare = goodness
return best_v
print(GoodnessComparer(x))
多谢您的协助！
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