than are not considered prime by the strict mathematical definition to be really pickythis code also fails for negative numbers and succeeds for floating-point numbers with no decimal digits also note that its code must use /instead of in python because of the migration of to "true division,as described in (we need the initial division to truncate remaindersnot retain them!if you want to experiment with this codebe sure to see the exercise at the end of part ivwhich wraps it in function for reuse more on the loop else because the loop else clause is unique to pythonit tends to perplex some newcomers (and go unused by some veteransi've met some who didn' even know there was an else on loops!in general termsthe loop else simply provides explicit syntax for common coding scenario--it is coding structure that lets us catch the "otherway out of loopwithout setting and checking flags or conditions supposefor instancethat we are writing loop to search list for valueand we need to know whether the value was found after we exit the loop we might code such task this way (this code is intentionally abstract and incompletex is sequence and match is tester function to be defined)found false while and not foundif match( [ ])print('ni'found true elsex [ :if not foundprint('not found'value at frontslice off front and repeat herewe initializesetand later test flag to determine whether the search succeeded or not this is valid python codeand it does workhoweverthis is exactly the sort of structure that the loop else clause is there to handle here' an else equivalentwhile xif match( [ ])print('ni'break [ :elseprint('not found'exit when empty exitgo around else only here if exhausted this version is more concise the flag is goneand we've replaced the if test at the loop end with an else (lined up vertically with the word whilebecause the break inside the main part of the while exits the loop and goes around the elsethis serves as more structured way to catch the search-failure case breakcontinuepassand the loop else