公式返回“ int”对象不可迭代

Question

以下是给出错误的代码：

from math import sqrt 

def normal(vector):
    sum = 0
    for i in vector:
        sum = sum + (i**2)
        norm = sqrt(sum)
    return round(norm, 4)

def innerproduct(vector_x, vector_y):
    sum = 0  
    for i in vector_x:
        for j in vector_y:
            sum = sum + (i*j)
            inner_product = sum
    return inner_product

def distance(vector_x, vector_y):
    distance = 0
    for i in vector_x:
        for j in vector_y:
            dist = normal(i)**2 + normal(j)**2 - (2*(innerproduct(i,j)))
    return sqrt(dist)

前两个函数运行正常，但第三个函数返回TypeError：'int'对象不可迭代。

Answer 1

我得到的错误是：

Traceback (most recent call last):
  File "t.py", line 25, in <module>
    print(distance([1,2],[5,6]))
  File "t.py", line 22, in distance
    dist = normal(i)**2 + normal(j)**2 - (2*(innerproduct(i,j)))
  File "t.py", line 5, in normal
    for i in vector:
TypeError: 'int' object is not iterable

因为在函数normal中，您对int（vector）进行了for循环。