I need to create decorator for a function so that if a particular function is called twice in a row with the same parameters, it will not run, and return None instead.
The function being decorated can have any number of parameters, but no keyword arguments.
For example:
@dont_run_twice def myPrint(*args): print(*args) myPrint("Hello") myPrint("Hello") #won't do anything (only return None) myPrint("Hello") #still does nothing. myPrint("Goodbye") #will work myPrint("Hello") #will work See if this simple approach works for you.
prev_arg = () def dont_run_twice(myPrint): def wrapper(*args): global prev_arg if (args) == prev_arg: return None else: prev_arg = (args) return myPrint(*args) return wrapper @dont_run_twice def myPrint(*args): print(*args) 
def filter_same_args(func): args_store = set() def decorator(*args): if args in args_store: return None args_store.add(args) func(*args) return decorator @filter_same_args def my_print(*args): print(*args) my_print('one', 'two', 3) my_print('one', 'two', 3) my_print('one', 'two', 3, 4) 