The built-in function "in" keyword in Python will return True if my_str contains str as a substring, and False otherwise. For example, my_str = "ICS3U teaches you to think differently" "ICS3C" in my_str will return False. But "ICS3U" in my_str will return True. Using this idea, write a function is_numerical_str(my_str) that accepts a string parameter my_str and returns True if my_str contains a number from 0-9 anywhere inside it. For example, my_str = "ICS3U" will return True since it contains the number 3. But "ICS" will return False.