decorator python
def our_decorator(func): def function_wrapper(x): print("Before calling " + func.__name__) func(x) print("After calling " + func.__name__) return function_wrapper @our_decorator def foo(x): print("Hi, foo has been called with " + str(x)) foo("Hi")
python decorator
import functools # A decorator is a Higher order function "_with_logging" # It takes the function to be decorated as its argument # In order to pass in some arbitrary arguments, it must be wrapped into # another HOF (Higher order function) that will receive the inputs def with_logging(level=logging.DEBUG, msg = None): def _with_logging(fn): # 'wraps' is a HOF that will give fn's name and docs to decorated_fn i.e. # decorated_fn.__name__ = fn.__name__ # help(decorated_fn) = help(fn) @functools.wraps(fn) def decorated_fn(*args, **kwargs): res = fn(*args, **kwargs) print("n***************", f"n{msg}", "nExecuting with Args: ", *args, **kwargs) logging.log(level, res) return res return decorated_fn return _with_logging # Used this way @with_logging(level=logging.DEBUG, msg="Some awesome comment") def hello_world(name): return f'Hello World {name}' # Results after calling hello_world("John") # # *************** # Some awesome comment # Executing with Args: John # Hello World John
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