python 装饰器进行函数运行时间统计

示例：

# encoding="utf-8"

import os
import random
import shutil
import time
import subprocess
from functools import wraps


def print_run_time(func):
    @wraps(func)
    def wrapper(*args, **kw):
        start_time = time.time()
        result = func(*args, **kw)
        end_time = time.time()
        print("函数的运行时间(s)：{}".format(end_time - start_time))
        print("函数的运行时间(ms)：{}".format(float(end_time - start_time) * 1000.0))
        return result

    return wrapper


@print_run_time
def sum():
    a = 1 + 2
    print(a)