![]() What’s the difference between a while loop and a for loop?Ĥ. Make a program that lists the countries in the set below using a while loop.Ģ. If you are a beginner, then I highly recommend this book. If the code gets very long you can also call functions from inside the loop. It should be noted that there can be multiple statements inside the while loop. A visual way of what happens when a while loop is entered. This is called the control flow graph (cfg). Schematically a while loop looks like the image below. Most of the times that is done with an iterator, but it could also be done by a boolean (switch). The program automatically leaves the while loop if the condition changes. In normal cases you want the program to exit the while loop at some point. You can also create infinite loops, this is when the condition never changes. ![]() Save then run with your Python IDE or from the terminal. Unlike a for loop, the iterator i is increased in the loop. Type this code:Įxecutes the code below until the condition x < 10 is met. The while loop below defines the condition (x < 10) and repeats the instructions until that condition is true. Il ciclo while esegue le sue istruzioni un numero sconosciuto di volte fino a quando la condizione data viene valutata true. Related course: Complete Python Programming Course & Exercises Example While loop example A while loop always consists of a condition and a block of code.Ī while loop ends if and only if the condition is true, in contrast to a for loop that always has a finite countable number of steps. Unlike for loops, the number of iterations in it may be unknown. ![]() Python "while" Loops (Indefinite Iteration)Ī while loop repeats code until the condition is met.
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