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def is_numeric(value):
    "Checks whether value is an integer or a float (decimal number)."
    return isinstance(value, int) or isinstance(value, float)

def is_coordinates(value):
    "Checks whether value is a tuple of two numeric values."
    try:
        x, y = value
        return is_numeric(x) and is_numeric(y)
    except (TypeError, ValueError):
        return False

def has_method(obj, method_name):
    "Checks whether the object has a method called `method_name`."
    attr = getattr(obj, method_name, None)
    return callable(attr)

def expect_type(obj, expected_type):
    """Checks whether obj is of the expected type. 
    If multiple types are provided, checks whether obj is one of the types.
    """
    try:
        if not any(isinstance(obj, t) for t in expected_type):
            raise TypeError(f"Expected {obj} to be one of the following types: {expected_type}")
    except TypeError:
        if not isinstance(obj, expected_type):
            raise TypeError(f"Expected {obj} to be a {expected_type}")