I get an error trying to run your sample: In [393]: my_array = np.array([[1,1,food,5], ...: [[2,1,food,5], ...: [2,2,clothes,10]]]) ... ... <看更多>

If you are familiar with Python's standard list indexing, indexing in NumPy will feel quite familiar. In a one-dimensional array, the ith value (counting ... ... <看更多>

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Data manipulation in Python is nearly synonymous with NumPy array manipulation: ... Keep in mind that, unlike Python lists, NumPy arrays have a fixed type. ... <看更多>