python3.x - python3.5的numpy设置array为float64，报错"name float64 is not defined"

Question

{代码...} 把dtype设置为float64会报错 NameError: name 'float64' is not defined 但是如果去掉"dtype=float64"会出现warning：DataConversionWarning: Data with input dtype &lt;U3 was converted to float64 ...

阿神 · Answer

Is it possible that you didn’t import float64
Of course it’s not right for you to import like this literally. .
Like this. .

import numpy as np
dtype=np.float64

怪我咯 · Answer

float64 is a class under numpy. If you want to use float64 without modification, you need to import it like this

import numpy as np
from numpy import float64


c = np.array([], dtype=float64)

If there is no from numpy import float64, use it like this

c = np.array([], dtype=np.float64)