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4 cze 2021 · Break and Continue Two useful commands in loops (while or for) are: break:exit the loop; continue:exit the current iteration, but continue with the loop. """Squareuserinputsuntila0isentered.""" while(True): num =int(input( "Enter an integer or 0 to stop: " )) ifnum == 0: break else: print( num ** 2 ) """Printallnumbers<100thatarenotmultiplesof5."""
In this tutorial, you'll learn about indefinite iteration using the Python while loop. You’ll be able to construct basic and complex while loops, interrupt loop execution with break and continue, use the else clause with a while loop, and deal with infinite loops.
30 sty 2013 · break stops the while loop, but there isn't a 'False signal': while means 'loop while the expression following the while statement evaluates as True', so if what comes after while is True itself, while will loop forever; break means 'stop looping right now' and works any loop, including both while and for loops.
The While Loop. This type of loop can be used if it’s not known in advance how many times that the loop will repeat (most powerful type of loop, any other type of loop can be simulated with a while loop). It can repeat so long as some arbitrary condition holds true. while (Boolean expression): body.
Breaking Out of a Loop. The break statement ends the current loop and jumps to the statement immediately following the loop. It is like a loop test that can happen anywhere in the body of the loop. while True: line = raw_input('> ') if line == 'done' : break print line. print 'Done!' > hello there. hello there. > finished.
Python "while" Loops (Indefinite Iteration) A while loop repeats code until the condition is met. Unlike for loops, the number of iterations in it may be unknown. A while loop always consists of a condition and a block of code.
How it works. The while True creates an indefinite loop. Once you enter quit, the condition color.lower() == 'quit' evaluates True that executes the break statement to terminate the loop. The color.lower() returns the color in lowercase so that you can enter Quit, QUIT or quit to exit the program.
