python列表处理效率对比测试

Posted 2021-01-05

Python列表添加元素效率测试

#!/usr/bin/env
import datetime
class adair:
    def test1(n):
        lst=[]
        for i in range(n*10000):
            lst = lst + [i]
        return lst

    def test2(n):
        for i in range(n*10000):
            lst = lst.append(i)
        return lst

    def test3(n):
        return [i for i in range(n*10000)]

    def test4(n):
        return list(range(n*10000)

if __name__ == ‘__main__‘:    
    f=adair()
    start = datetime.datetime.now()
    f.test1(2)
    end = datetime.datetime.now()
    print(end-start)

    start = datetime.datetime.now()
    f.test2(2)
    end=datetime.datetime.now()
    print(end-start)

    start=datetime.datetime.now()
    f.test3(2)
    end=datetime.datetime.now()
    print(end-start)

    start=datetime.datetime.now()
    f.test4(2)
    end=datetime.datetime.now()
    print(end-start)

测试结果如下：