有关 list 内存释放的小技巧
用python也有一段时间了,有了不少体会。平时老写要求效率很高的程序,发现python真的很不错。但是对于超大list的数据, 内存经常需要立即释放。 我总结了一些有关性能的技巧,看看大家能不能用上。 1。大数据量的list,要进行局部元素删除,尽量避免用del随
用python也有一段时间了,有了不少体会。平时老写要求效率很高的程序,发现python真的很不错。但是对于超大list的数据,
内存经常需要立即释放。我总结了一些有关性能的技巧,看看大家能不能用上。
1。大数据量的list,要进行局部元素删除,尽量避免用del随机删除,非常影响性能,如果删除量很大,不如直接新建list,
然后用下面的方法释放清空旧list。
2。对于一般性数据量超大的list,快速清空释放内存,可直接用 a = [] 来释放。其中a为list。
3。对于作为函数参数的list,用上面的方法是不行的,因为函数执行完后,list长度是不变的,
但是可以这样在函数中释放一个参数list所占内存: del a[:],速度很快,也彻底:)

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