import warnings


def deprecated(replaced_by_func):
    """
    This decorator is used to mark functions as deprecated. It also points
    the user to the newer function that should be used instead.
    """
    def wrap(f):
        def new_func(*args, **kwargs):
            warnings.simplefilter('always', DeprecationWarning)
            warnings.warn(
                "Call to deprecated function " + f.__name__ +
                ". This method is replaced by " + replaced_by_func.__name__,
                category=DeprecationWarning, stacklevel=2)
            warnings.simplefilter('default', DeprecationWarning)
            return f(*args, **kwargs)
        new_func.__dict__.update(f.__dict__)
        new_func.__doc__ = f.__doc__
        new_func.__name__ = f.__name__
        return new_func
    return wrap