The data type of the array

1. Data array type

bool     int32     int64    str    float32    float64...................................

2. Set the data type array

Data type (1) arranged in an array

import numpy as np
arr=np.array([[1,2,3,4],[2,3,4,5]],dtype=np.float64)
print('arr:',arr)
print('arr数据类型：',arr.dtype)

When you create an array, there is no limit on the data type of the array, the data type is int32

After adding the dtype = np.float64, array type array would change.

(2) custom data types

import numpy as np
df=np.dtype([("name",np.str_,40),("height",np.float64),("weight",np.float64)])
arr=np.array([("王宝强",165.0,75.0),("黄渤",170.0,80.0),("徐峥",180.0,85.0)],dtype=df)
print('arr:',arr)
print('arr数据类型：',arr.dtype)