list,array, asarray, ndarray

import numpy as np
data0 = [[1,1,1],[1,1,1],[1,1,1]]  # dtype = 'list'
data1 = np.array([[1.,1.,1.],[1.,1.,1.],[1.,1.,1.]])
data1_1 = np.array(data0)
data2 = np.asarray(data0)
print(data2, data2.dtype)
print(data2 is data1_1)
data3 = np.ones((3, 3))  # 默认生成 'float' 型
print(data1, data1.dtype)
print(data1_1, data1_1.dtype)
print(data3, data3.dtype)

[[1 1 1]
[1 1 1]
[1 1 1]] int32
False
[[1. 1. 1.]
[1. 1. 1.]
[1. 1. 1.]] float64
[[1 1 1]
[1 1 1]
[1 1 1]] int32
[[1. 1. 1.]
[1. 1. 1.]
[1. 1. 1.]] float64