请用python写一个找出一千以内水仙花数的函数

def narcissistic_numbers():
result = []
for i in range(1, 1001):
digits = [int(d) for d in str(i)]
sum = 0
for digit in digits:
sum += digit ** len(digits)
if sum == i:
result.append(i)
return result

print(narcissistic_numbers())