测试一行代码的运行时间,在python中比较方便,可以直接使用timeit:
>>> import timeit
#执行命令
>>> t2 = timeit.Timer('x=range(1000)')
#显示时间
>>> t2.timeit()
10.620039563513103
#执行命令
>>> t1 = timeit.Timer('sum(x)', 'x = (i for i in range(1000))')
#显示时间
>>> t1.timeit()
0.1881566039438201
import timeit
sum_by_for ="""
for d in data:
s += d
"""
def timeit_using_list(n, loops):
list_setup = """
data = [1] * {}
s = 0
""".format(n)
print('list result:')
print(timeit.timeit(sum_by_for, list_setup, number = loops))
if __name__ == '__main__':
timeit_using_list(30000, 500)
list result:
0.872876773999451