[已解决]请教为什么跟着视频输入还是出现错误？

WheatBlock

fibonacci_cache = {}
def fibonacci(n):
  #If we have cached the value, then return it
  if n in fibonacci_cache:
    return fibonacci_cache[n]
   #Compute the Nth term
  if n == 1:
    value = 1
  elif n== 2:
    value = 1
  elif n > 2:
    value = fibonacci(n-1) + fibonacci(n-2)
#Cache the value and return it
    fibonacci_cache[n] = value
    return value
for n in range(1,101):
  print(n,":", fibonacci(n))


提示 ：   value = fibonacci(n-1) + fibonacci(n-2)
TypeError: unsupported operand type(s) for +: 'NoneType' and 'NoneType'

最佳答案

月排行榜 / 总排行榜

人造人

2022-6-24 12:40:10

注意缩进

1. #!/usr/bin/env python
   
2. #coding=utf-8
   
3. 
   
4. fibonacci_cache = {}
   
5. 
   
6. def fibonacci(n):
   
7.     #If we have cached the value, then return it
   
8.     if n in fibonacci_cache:
   
9.         return fibonacci_cache[n]
   
10.     #Compute the Nth term
    
11.     if n == 1:
    
12.         value = 1
    
13.     elif n== 2:
    
14.         value = 1
    
15.     elif n > 2:
    
16.         value = fibonacci(n-1) + fibonacci(n-2)
    
17. #Cache the value and return it
    
18.     fibonacci_cache[n] = value
    
19.     return value
    
20. for n in range(1,101):
    
21.     print(n,":", fibonacci(n))
    

复制代码

跳转到最佳答案楼层

人造人

注意缩进

1. #!/usr/bin/env python
   
2. #coding=utf-8
   
3. 
   
4. fibonacci_cache = {}
   
5. 
   
6. def fibonacci(n):
   
7.     #If we have cached the value, then return it
   
8.     if n in fibonacci_cache:
   
9.         return fibonacci_cache[n]
   
10.     #Compute the Nth term
    
11.     if n == 1:
    
12.         value = 1
    
13.     elif n== 2:
    
14.         value = 1
    
15.     elif n > 2:
    
16.         value = fibonacci(n-1) + fibonacci(n-2)
    
17. #Cache the value and return it
    
18.     fibonacci_cache[n] = value
    
19.     return value
    
20. for n in range(1,101):
    
21.     print(n,":", fibonacci(n))
    

复制代码

WheatBlock

可以了，谢谢！