def gen_list1():  
  l = []  
  for i in range(1000):    
    l = l + [i]

def gen_list2():  
  l = []  
  for i in range(1000):    
    l.append(i)

def gen_list3():  
  l = [i for i in range(1000)]

def gen_list4():  
  l = list(range(1000))

from timeit import Timer

t1 = Timer("gen_list1()", "from __main__ import gen_list1")
print("连接方式：", t1.timeit(number=1000), "ms")

t2 = Timer("gen_list2()", "from __main__ import gen_list2")
print("append方法：", t2.timeit(number=1000), "ms")

t3 = Timer("gen_list3()", "from __main__ import gen_list3")
print("列表表达式：", t3.timeit(number=1000), "ms")

t4 = Timer("gen_list4()", "from __main__ import gen_list4")
print("range函数：", t4.timeit(number=1000), "ms")