python中列表数据保留2位小数（一维，二维）

直接转：

import numpy as np
list_2d =[[0.23222,0.331212,0.21398331],[0.345222,0.391212,0.81398331],[0.98222,0.761212,0.99398331]]
print(list_2d)
print(np.round(list_2d,2))

（1）一维：

   代码：

list_1d=[0.23222,0.331212,0.21398331]
print(list_1d)
mid_np = np.array(list_1d)
print(mid_np)
mid_np_2f = np.round(mid_np,2)
print(mid_np_2f)

   运行结果：

 （2）二维：

 代码：

import numpy as np
list_2d =[[0.23222,0.331212,0.21398331],[0.345222,0.391212,0.81398331],[0.98222,0.761212,0.99398331]]
print(list_2d)
mid_np = np.array(list_2d)
print(mid_np)
mid_np_2f = np.round(mid_np,2)
print(mid_np_2f)
print(mid_np_2f.tolist())

  运行结果：

补充：python中 list 与数组的互相转换

(1)list转array

    np.array(a)

(2)array 转list

    a.tolist()