Python函数计时

函数计时-函数装饰器

from functools import wraps
import time
def func_timer(function):
    '''
    用装饰器实现函数计时
    :param function: 需要计时的函数
    :return: None
    '''
    @wraps(function)
    def function_timer(*args, **kwargs):
        print('[Function: {name} start...]'.format(name = function.__name__))
        t0 = time.time()
        result = function(*args, **kwargs)
        t1 = time.time()
        print('[Function: {name} finished, spent time: {time:.2f}s]'.format(name = function.__name__,time = t1 - t0))
        return result
    return function_timer
@func_timer
def test():
    time.sleep(1.5)
if __name__ == '__main__':
    test()
'''
[Function: test start...]
[Function: test finished, spent time: 1.50s]
'''

代码片段计时——上下文管理器

from functools import wraps
import time
class Timer(object):
    '''
    用上下文管理器计时
    '''
    def __enter__(self):
        self.t0 = time.time()
    def __exit__(self, exc_type, exc_val, exc_tb):
        print('[time spent: {time:.2f}s]'.format(time = time.time() - self.t0))
if __name__ == '__main__':
    with Timer() as t:
        print('do something')