縮進問題，Python嚴格控制縮進，縮進塊就相當于某些語言的{}，這是我寫的：

def?square_of_sum(L):
????sum?=?0
????for?x?in?L:
????????sum?+=?x*x
????return?sum
print?square_of_sum([1,?2,?3,?4,?5])
print?square_of_sum([-5,?0,?5,?15,?25])

def?square_of_sum(L):
????sum?=?0
????for?x?in?L:
????????sum=sum+x*x
????return?sum
print?square_of_sum([1,?2,?3,?4,?5])
print?square_of_sum([-5,?0,?5,?15,?25])

def?square_of_sum(L):
????sum?=?0
????for?x?in?L:
????????sum=sum+x*x
????????return?sum
print?square_of_sum([1,?2,?3,?4,?5])
print?square_of_sum([-5,?0,?5,?15,?25])

def?square_of_sum(L):????
????sum=0????
????for?x?in?L:????????
	sum=sum+x*x????????
return?sum?
print?square_of_sum([1,?2,?3,?4,?5])?
print?square_of_sum([-5,?0,?5,?15,?25])

應該是你的縮進格式有問題，以上應該是標準的縮進形式。Python不像java，C語言那樣有中括號包裹語句塊，Python主要的是通過縮進來標志所同屬的語句塊。