====== Python: Decorator ======

===== 함수 실행시간 측정 =====

<code python>
from functools import wraps


def elapsed_time(func):
    import time
    
    @wraps(func)
    def wrapped(*args, **kwargs):
        start_time = time.perf_counter()
        returns = func(*args, **kwargs)
        end_time = time.perf_counter()
        print('{} -> elased time: {:.3f}'.format(func.__name__, end_time - start_time))
        return returns
    
    return wrapped
  
  
@elapsed_time
def test_sleep(t):
    import time
    time.sleep(t)
    return True
</code>

  
====== Logger wrapping ======

terminal 창의 마지막 줄에 elapsed time을 계속 표시함

<code python>
def logger_info_with_state_bar(func):

    global start_time

    def wrapped(msg):
        columns = os.get_terminal_size().columns
        print(Fore.RESET + Back.RESET + ' ' * (columns - 1), end='\r')
        func(msg)
        status = 'elapsed time: {}'.format(time.time() - start_time)
        if len(status) < (columns - 1):
            status += ' ' * (columns - len(status) - 1)
        print(Back.GREEN + Fore.BLACK + status + Fore.RESET + Back.RESET, end='\r')

    return wrapped

logger.info = logger_info_with_state_bar(logger.info)
</code>
  
===== Decorator with parameters =====

<code python>
def decorator_factory(argument):
    def decorator(function):
        def wrapper(*args, **kwargs):
            funny_stuff()
            something_with_argument(argument)
            result = function(*args, **kwargs)
            more_funny_stuff()
            return result
        return wrapper
    return decorator
    
# https://stackoverflow.com/questions/5929107/decorators-with-parameters
</code>

===== 튜토리얼 =====

  * http://www.hanbit.co.kr/network/category/category_view.html?cms_code=CMS5689111564