import numpy as npa = np.array(42)b = np.array([1, 2, 3, 4, 5])c = np.array([[1, 2, 3], [4, 5, 6]])d = np.array([[[1, 2, 3], [4, 5, 6]], [[1, 2, 3], [4, 5, 6]]])print(a.ndim)print(b.ndim)print(c.ndim)print(d.ndim)执行结果:0123