练习题第三题
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# 练习题3: 切片和索引操作
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# 题目: 有一个NumPy数组 a = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]) ,
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# 请使用切片和索引操作获取数组的第二行第三列的元素。
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import numpy as np
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a = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
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print(a[1, 2])
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