5.1/2/3 Loops¶ A loop is a program construct that repeatedly executes the loop's statements (known as the loop body) while the loop's expression is true; when false, execution proceeds past the loop Each time through a loop's statements is called an iteration. While loop basics¶ A while loop is a construct that repeatedly executes an indented block of code (known as the loop body) as long as the loop's expression is True At the end of the loop body, execution goes back to the while loop statement and the loop expression is evaluated again But, if the expression evaluates to False, then execution instead proceeds to below the loop body. Sentinel value: the value needed to terminate a loop Good practice is to include greater than or less than along with equality in a loop expression to help avoid infinite loops. Example: Greatest Common Divisor¶ Example: Conversation¶ Example: Getting input until a sentinel is seen¶
