The preferred way to get the length of any python object is to pass it as an argument to the len function. Internally, python will then try ... ... <看更多>

This is an excerpt from the Python Data Science Handbook by Jake VanderPlas; ... NumPy has fast built-in aggregation functions for working on arrays; ... ... <看更多>

A more common approach is to over-allocate space and then keep two values, "length" and "_allocated". The first is how many valid elements your ... ... <看更多>

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def first_last6(nums):. """ Given an array of ints, return True if 6 appears as either the first or last. element in the array. The array will be length 1 ... ... <看更多>