def opAll(operator, *numbers):
    """opAll(op, numbers) --> Based on the first arg operator, the function applies to the given set of numbers.

    Parameters:
    op: Operator: + or - or * or /
    numbers: Any length of numbers

    Returns:
     A floating point number
    """
    numbers = list(numbers)
    res = numbers.pop(0)
    if operator == '+':
        for n in numbers:
            res = res + n

    
    elif operator == '*':
        for n in numbers:
            res = res * n

    elif operator == '-':
        for n in numbers:
            res = res - n

    elif operator == '/':
        for n in numbers:
            res = res / n

    else:
        print('Operator', operator, 'is not applicable on the numbers')
    return res