1.for循环+
def fun1():
l = []
for i in range(1000):
l = l + [i]
2.for循环append
def fun2():
l = []
for i in range(1000):
l.append(i)
3.生成器
def fun3():
l = [i for i in range(1000)]
4.list加range
def fun4():
l = list(range(1000))
速度对比选择Python库timeit
t1 = Timer("fun1()", "from __main__ import fun1")
print("concat:",t1.timeit(number=1000), "milliseconds")
t2 = Timer("fun2()", "from __main__ import fun2")
print("concat:",t2.timeit(number=1000), "milliseconds")
t3 = Timer("fun3()", "from __main__ import fun3")
print("concat:",t3.timeit(number=1000), "milliseconds")
t4 = Timer("fun4()", "from __main__ import fun4")
print("concat:",t4.timeit(number=1000), "milliseconds")
运行结果:
concat: 0.767764812 milliseconds
concat: 0.057362731 milliseconds
concat: 0.027215053000000045 milliseconds
concat: 0.014774799999999977 milliseconds