Python Programming | JNTUA | UNIT 2 | Fruitful Functions |
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This document discusses Python programming concepts including fruitful functions, return values, incremental development, nested functions, Boolean functions, recursion, and type checking. Fruitful functions allow a function to return a value that can be used. Return values terminate function execution, and code after a return is dead code. Incremental development adds and tests small amounts of code at a time to avoid long debugging sessions. Nested functions allow one function to be called within another through composition. Boolean functions return True or False values. Recursion and type checking with isinstance are also covered.
Python Programming | JNTUA | UNIT 2 | Fruitful Functions |
- 1. Python Programming Unit – II (Part III) (Lecture 12) Fruitful functions Return values Incremental development Nested functions
- 2. Fruitful functions Lecture 12 Lecture 13 Return values Incremental development Nested functions Boolean functions More recursion Checking types
- 3. Fruitful functions Lecture 12 Return values Incremental development Nested functions
- 4. • As soon as a return statement executes, the function terminates without executing any subsequent statements. • Code that appears after a return statement is called dead code. Return values
- 5. Return values Function: Statement 3 Statement 4 Statement 5 Statement 6 …. …. Program: Statement 1 Statement 2 Call function Statement 7 Call function …. …. Executed Function without return
- 6. Return values Function: Statement 3 Statement 4 return Statement 5 Statement 6 …. …. Program: Statement 1 Statement 2 Call function Statement 7 Call function …. …. Executed Function with return Dead code
- 7. Fruitful functions Lecture 12 Return values Incremental development Nested functions
- 8. Incremental development • Larger functions are difficult to debug. • To deal with complex programs, use incremental development. • The goal of incremental development is to avoid long debugging sessions by adding and testing only a small amount of code at a time.
- 9. Incremental development • Suppose you want to find the distance between two points, given by the coordinates (x1, y1) and (x2, y2). • By the Pythagorean theorem, the distance is:
- 10. Fruitful functions Lecture 12 Return values Incremental development Nested functions
- 11. Nested functions • We can call one function from within another. This ability is called composition.
- 12. Fruitful functions Lecture 12 Return values Incremental development Nested functions
- 13. Python Programming Unit – II (Part III) (Lecture 13) Fruitful functions Boolean functions More recursion Checking types
- 14. Fruitful functions Lecture 12 Lecture 13 Return values Incremental development Nested functions Boolean functions More recursion Checking types
- 15. Fruitful functions Lecture 13 Boolean functions More recursion Checking types
- 16. Boolean functions • Functions can return Booleans. • For hiding complicated tests inside functions.
- 17. Fruitful functions Lecture 13 Boolean functions More recursion Checking types
- 18. More recursion
- 19. More recursion
- 20. Fruitful functions Lecture 13 Boolean functions More recursion Checking types
- 21. Checking types
- 22. Checking types • We can use the built-in function isinstance to verify the type of the argument.
- 23. Fruitful functions Lecture 13 Boolean functions More recursion Checking types