Python 不同列表时间测试

 import timeit
 import threading
 
 def test1():
     l = []
     for i in range(1000):
         l = l + [i]
 
 def test2():
     l = []
     for i in range(1000):
             l.append(i)
 
 def test3():
     l = [i for i in range(1000)]  
 
 def test4():
     l = list(range(1000))  
 
 t1 = timeit.Timer("test1()","from __main__ import test1")
 print("concat", t1.timeit(number = 1000),"milliseconds")
 
 t2 = timeit.Timer("test2()","from __main__ import test2")
 print("append", t2.timeit(number = 1000),"milliseconds")
 
 t3 = timeit.Timer("test3()","from __main__ import test3")
 print("comprehension", t3.timeit(number = 1000),"milliseconds")
 
 t4 = timeit.Timer("test4()","from __main__ import test4")
 print("listrange", t4.timeit(number = 1000),"milliseconds")

concat 2.0353527 milliseconds
append 0.14437619999999995 milliseconds
comprehension 0.05449919999999997 milliseconds
listrange 0.03860090000000005 milliseconds