If a function's return statement has no expression, what is the result?

When a function's return statement is used without an expression, it implicitly returns the value None. In Python, when a function is executed and reaches a return statement without an accompanying value, it signifies the end of the function's execution with no specific value being returned. This behavior means that the function can still be used as part of a program, but it will yield None when called.

This return value of None is particularly useful in Python because it allows functions to indicate that they have completed execution without producing a meaningful result, distinguishing between a function that returns a value and one that does not. Additionally, the function can still interact with elements or perform operations as needed, even if it does not provide a value upon completion.

This concept is foundational in understanding how functions operate in Python, especially in contexts where output may not always be necessary, such as in functions that are primarily designed for side effects (like printing to console or modifying a global variable).