1 / 13

Mastering Loops in Python: A Comprehensive Guide

Dive deep into different types of loops including for, while, and sentinel-controlled loops. Learn the nuances and applications in Python programming under the guidance of Dr. Sarah Diesburg in CS1510 class. Enhance loop control and efficiency for better coding practices.

vanwyk
Download Presentation

Mastering Loops in Python: A Comprehensive Guide

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. More Repetition While and For Loops Sentinel-Controlled Loops Intro to Computer Science CS1510 Dr. Sarah Diesburg

  2. Today’s Agenda • Exploring looping alternatives • For and While loops • Sentinel-Controlled vs Count-Controlled loops

  3. Some Things From PA02 • BMI • These were continuous regions. • Set up your code to handle all areas…

  4. Some Things From PA02 • BMI • While this is valid mathematically, it is bad form in programming languages. • And it causes real problems when not set up properly.

  5. Some Things From PA02 • BMI • Recognize that these are four related categories. This makes it much easier to use if/elif/else.

  6. Some Things From PA02 • BMI • Recognize that these are four related categories. This makes it much easier to use if/elif/else.

  7. Some Things From PA02 • BMI • Recognize that these are four related categories. This makes it much easier to use if/elif/else.

  8. Loops • Count-controlled loop, which means we will know in advance how many times the loop will run • Sentinel-controlled loop, which means we do not know in advance how many times the loop will run • Controlled by sentinels • Event-controlled

  9. For Loops for varName in iterableDataStructure: (next thing in DataStructure put in varName) suite of code • Is a for loop count-controlled or sentinel-controlled?

  10. While Loops while boolean expression: statementSuite • If while loop is count-controlled, will it contain some kind of counter?

  11. Moving to Sentinel Controlled • For loops are always count-controlled • Every for loop could be written as a while loop (although usually a little more complicated to set up) • While loops can behave like count controlled loops (kid in the car from this week) but also as sentinel-controlled loops (average quiz score from this week).

  12. Let’s go back to Thursday’s Lab • The “challenge” of using a while loop is that it is a pre-test solution. • That is, you have to have some data to work with • Several solutions to the “average” problem • Adjusting for the extra loop (example 1) • Using a “loop and a half” (example 2) • Infinite loops with a break statement (example 3)

  13. Let’s look at some code

More Related