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>

We can create numpy arrays with more than one dimension. This section will focus only on 2D arrays, but you ... ... <看更多>

Array Indexing: Accessing Single Elements¶. If you are familiar with Python's standard list indexing, indexing in NumPy will feel quite familiar. In a ... ... <看更多>

First off don't use multiplication . It's creates 2 lists, not 7001. To better show this, hop into IDLE: >>> a = [[0] * 3] * 3 >>> a [[0, 0, ... ... <看更多>

The NumPy library is the most widely-supported means for supporting numeric arrays in Python. In this exercise, you will use the meshgrid function in NumPy ... ... <看更多>