You're technically trying to index an uninitialized array. You have to first initialize the outer list with lists before adding items; Python calls this ... ... <看更多>

In this lesson, we are going to learn Python 2D lists. Python 2D lists are very useful in machine learning and data science. ... <看更多>

You can create a two dimensional array by applying np.array() to a list of lists, as long as the sublists are of the same size, and contain elements of a ... ... <看更多>

Initialize 2D Array /List in Python. GitHub Gist: instantly share code, notes, and snippets. ... <看更多>

To fix this, consider writing it in this form instead: [[0, 0] for _ in range(2)] which will create two brand-new lists and combine them ... ... <看更多>