A while loop is apt for this task because it allows you to repeatedly check if the current number is negative and, if not, print it. When a negative number is encountered, the loop terminates, ensuring only non-negative numbers are printed.

When sorting a list using the sort() method, you can provide a key argument to specify a custom sorting behavior. This allows you to sort based on specific criteria or functions.

To create a tuple with a single item, you need to add a comma after the item. For example, my_tuple = (42,). A trailing comma distinguishes a single-item tuple from an expression in parentheses.

To recommend new products to User A based on User B's purchases while avoiding duplicates, you would use the "Difference" set operation. This will provide products in User B's set that are not in User A's set.

Python uses a technique called "name mangling" to make attributes private by adding a prefix to their names.

You can use 'from module import function' to import only a specific function or class from a module in Python.

The values() method in Python returns a view object that displays a list of all the values in the dictionary. You can convert this view to a list if needed.

A REPL (Read-Eval-Print Loop) is an interactive environment where you can input and execute Python commands interactively.

Python was created by Guido van Rossum in the late 1980s and was first released in 1991.

In the case of multiple inheritance, if two base classes have a method with the same name, the method of the first base class listed in the inheritance declaration is invoked. In this scenario, calling power_on() from a Laptop object without specifications will invoke the power_on() method of the Computer class.

Tuples in Python are immutable, which means their elements cannot be changed or modified after the tuple is created.

In Python, the maximum length of an identifier (variable name, function name, etc.) is 79 characters. However, it's good practice to keep identifiers concise and meaningful.