如何高效读取NumPy数组中的数据？

>>> import numpy as np>>> a = np.array([[1, 2], [3, 4]])>>> a.tolist()[[1, 2], [3, 4]]

>>> b = np.array(1)>>> b.tolist()1>>> list(b)Traceback (most recent call last):  File "<stdin>", line 1, in <module>TypeError: iteration over a 0-d array>>>