Python的：限制在数组中元素的个数 [英] Python: Limiting number of elements in an array

问题描述

我使用的磨床和我有一个Python脚本，执行一些的Java API来收集的最小值，最大值，执行数和总执行（后者2中得到的平均执行时间）。这是每一个API（这是一个多维数组），并且每个线程中完成的。

I am using The Grinder and I have a Python script which executes some Java APIs to gather the minimum, maximum, number of executions, and total executions (the latter 2 to get the average execution times). This is done for each API (it's a multidimensional array) and each thread.

#Contents of apiTimingsList array: [min, max, number of executions, total execution time]
apiTimingsList = [[9999,0,0,0] for j in range(len(apiList))]

我调查的一些内存的问题，我认为这阵规模的不断扩大可能是一个问题。作为测试运行它会不断地增长。举例来说，如果我有10 API和我运行900线程，有9000阵列将继续增长，只要测试运行。

I am investigating some memory issues and I think that the growing size of this array might be a problem. It will grow constantly as the test runs. For example, if I have 10 APIs and I am running 900 threads, there are 9000 arrays that will keep growing as long as the test runs.

有没有办法来限制这些数组的大小，说只保留执行的最后x号，以便我的计算仍然是有效的，但数组不增长的失控？

Is there a way to limit the size of these arrays, to say only keep the last x number of executions so my calculations are still valid but the arrays are not growing out of control?

推荐答案

您可以使用 collections.deque ：

>>> from collections import deque
>>> d = deque(maxlen=2)
>>> d.append(3)
>>> d.append(4)
>>> d.append(5)
>>> d
    deque([4, 5], maxlen=2)

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