To define a class attribute that should not be overridden by subclasses, prefix it with an underscore (_). While Python doesn't enforce strict encapsulation, this convention signals to other programmers that the attribute should not be modified.

The '@staticmethod' decorator in a class is used to turn a method into a class-specific method. Class-specific methods do not depend on instance-specific data and can be called on the class itself, without creating an instance.

The add() method is used to add a single element to a set in Python. It takes one argument, the element you want to add, and modifies the set in place.

To execute a block of code only if multiple conditions are all true in Python, you use the 'and' operator. It checks if all the specified conditions are true before executing the associated code block.

In Python, private access to class members is conventionally enforced by prefixing their names with an underscore (_). While this doesn't make them entirely inaccessible, it signals to other developers that these members should be treated as private and not accessed directly. It's a convention, not a strict enforcement, and it's part of Python's "we are all consenting adults here" philosophy.

To check if neither 'a' nor 'b' are true, you would use the 'not' operator before both 'a' and 'b'. The expression 'not a and not b' ensures that both 'a' and 'b' are not true.

The philosophy of Python is famously summarized in the "Zen of Python" (PEP 20). It's a collection of guiding aphorisms for writing computer programs in Python, providing insights into the design principles and philosophy behind the language.

In Python, the __get__ method is automatically invoked when an attribute's value is retrieved using dot notation.

The intersection operation between two sets in Python returns a new set containing all elements that are common to both sets. If there are no common elements, it returns an empty set.

The 'math' module is a built-in Python module that provides a wide range of mathematical functions, such as trigonometric, logarithmic, and exponential functions.

In scenarios where JSON data keys are not simple strings, the key_transform argument of the json module can be utilized to handle non-string keys by providing a custom function for key transformation.

To compute the sum of all positive numbers in a list, a conditional statement can be most beneficial. You can iterate through the list of numbers and use a conditional statement to check if each number is positive before adding it to the sum. This allows you to selectively sum the positive numbers in the list.