Python 如何修复“TypeError: len() of unsized object”
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时间：2020-08-19 23:11:57 来源:igfitidea点击:
How to fix "TypeError: len() of unsized object"
提问by Xabier Garcia Andrade
I am getting:
我正进入（状态：
TypeError: len() of unsized object
TypeError: len() of unsized object
after running the following script:
运行以下脚本后：
from numpy import *
v=array(input('Introduce un vector v: '))
u=array(input('Introduce un vector u: '))
nv= len(v)
nu= len(u)
diferenza= 0; i=0
if nv==nu:
while i<nv:
diferenza=diferenza + ((v[i+1]-u[i+1]))**2
modulo= sqrt(diferenza)
print('Distancia', v)
else:
print('Vectores de diferente dimensión')
How can I fix this?
我怎样才能解决这个问题？
回答by Moses Koledoye
Use the arrays' sizeattribute instead:
改用数组的size属性：
nv = v.size
nu = u.size
You also probably want to use numpy.fromstringto take and convert the input string into an array:
您可能还想使用numpy.fromstring将输入字符串转换为数组：
>>> v = np.fromstring(input('enter the elements of the vector separated by comma: '), dtype=int, sep=',')
enter the elements of the vector separated by comma: 1, 2, 3
>>> v
array([1, 2, 3])
>>> len(v)
3
>>> v.size
3
