numpy.ndarray.tolist
method
ndarray.tolist()
Return the array as an a.ndim-levels deep nested list of Python scalars. nested:嵌套的
Return a copy of the array data as a (nested) Python list. Data items are converted to the nearest
compatible builtin Python type, via the item function.
以(嵌套的)Python列表的形式返回数组数据的副本。通过item函数，将数据项转换为Python中最接近的兼容内置类型。（有道）
If a.ndim is 0, then since the depth of the nested list is 0, it will not be a list at all, but a simple
Python scalar.
Parameters:
none
Returns:
y : object, or list of object, or list of list of object, or …
The possibly nested list of array elements. 数组元素的嵌套列表
Notes:
The array may be recreated via a = np.array(a.tolist()), although this may sometimes lose precision.
官网例子截图：
