timeit模块
timeit模块可以用来测试一小段Python代码的执行速度
class timeit.Timer(stmt=‘pass’,setup=‘pass’,timer=)
Timer是测量⼩段代码执⾏速度的类。
stmt参数是要测试的代码语句(statment);
setup参数是运⾏代码时需要的设置;
timer参数是⼀个定时器函数,与平台有关。
timeit.Timer.timeit(number = 1000000)
Timer类中测试语句执行速度的对象方法。
number参数是测试代码的测试次数,默认为1000000。方法返回代码的平均耗时,一个float类型的秒数。
# list的操作测试
def t1():
l = []
for i in range(1000):
l = l + [i]
def t2():
l = []
for i in range(1000):
l.append(i)
def t3():
l = [i for in range(1000)]
def t4():
l = list(range(1000))
from timeit import Timer
timer1 = Timer("t1()","from __main__ import t1")
print("concat: " + timer1.timeit(number=1000))
timer2 = Timer("t2()","from __main__ import t2")
print("append: ",timer2.timeit(number=1000))
timer3 = Timer("t3()","from __main__ import t3")
print("comprehension: ",timer3.timeit(number=1000))
timer4 = Timer("t4()","from __main__ import t4")
print("list range: ",timer4.timeit(number=1000))