nonstandard loop structures such as loop-and- -half can be built using while loop having loop condition of true and using break statement to provide loop exit python boolean operators and and or employ short-circuit evaluation they also have operational definitions that allow them to be used in certain decision contexts even though python has built-in bool data typeother data types ( intmay also be used where boolean expressions are expected exercises review questions true/false python while implements definite loop the counted loop pattern uses definite loop sentinel loop asks the user whether to continue on each iteration sentinel loop should not actually process the sentinel value the easiest way to iterate through the lines of file in python is to use while loop while is post-test loop the boolean operator or returns true when both of its operands are true and ( or =( and bor ( and not( or =(not aor not( true or false multiple choice loop pattern that asks the user whether to continue on each iteration is called (nainteractive loop bend-of-file loop csentinel loop dinfinite loop loop pattern that continues until special value is input is called (nainteractive loop bend-of-file loop csentinel loop dinfinite loop loop structure that tests the loop condition after executing the loop body is called apre-test loop bloop-and- -half csentinel loop dpost-test loop