8. Decorator with Optional Arguments Creating a decorator that works with or without arguments: def smart_decorator(arg=None): def decorator(func): @wraps(func) def wrapper(*args, **kwargs): if arg: print(f"Argument: {arg}") return func(*args, **kwargs) return wrapper if callable(arg...
sleep(rate) return func(*args, **kwargs) return wrapper_slow_down if _func is None: return decorator_slow_down else: return decorator_slow_down(_func) You’re using the boilerplate introduced in the Creating Decorators With Optional Arguments section to make @slow_down callable both with ...
def decorator_with_arguments(function): def wrapper_accepting_arguments(arg1, arg2): print("My arguments are: {0}, {1}".format(arg1,arg2)) function(arg1, arg2) return wrapper_accepting_arguments @decorator_with_arguments def cities(city_one, city_two): print("Cities I love are {0} an...
*other_data (list): Additional data items to incorporate into processing. output_format (str, optional): Desired output format. Defaults to "json". **options (dict): Arbitrary keyword arguments to customize processing. Returns: str or dict: Processed data in the chosen output format. """ ....
The @pedantic decorator does the following things: The decorated function can only be called by using keyword arguments. Positional arguments are not accepted. The decorated function must have type annotations. Each time the decorated function is called, pedantic checks that the passed arguments and ...
$ ptpython --help usage: ptpython [-h] [--vi] [-i] [--light-bg] [--dark-bg] [--config-file CONFIG_FILE] [--history-file HISTORY_FILE] [-V] [args ...] ptpython: Interactive Python shell. positional arguments: args Script and arguments optional arguments: -h, --help show ...
decorator装饰器 装饰器是把一个要执行的函数包含在wrapper函数里面,并且在要执行的函数前后去执行代码 classmethod和staticmethod staticmethod不需要已经实例化的类的函数来作为输入,可以传入任何东西。method中不使用self就不会改变class instance,因此不传入class instance或者没有class instance的时候也能被调用。
The optional arguments flags and dont_inherit control which future statements affect the compilation of source.If neither is present (or both are zero) the code is compiled with those future statements that are in effect in the code that is calling compile().If the flags argument is given and...
The Python v1 model uses a functions.json file to define functions, and the new v2 model lets you instead use a decorator-based approach. This new approach results in a simpler file structure, and it's more code-centric. Choose the v2 selector at the top of the article to learn about...
Django provides a simple way to define__str__()and ` __unicode__()`_ methods that work on Python 2 and 3: you must define a__str__()method returning text and to apply thepython_2_unicode_compatible()decorator. On Python 3, the decorator is a no-op. On Python 2, it defines ...