import random

print 'Red balls and blue ball are created program!' a = raw_input('Do you want to create numbers?(Y/N)') list1 = ['y','Y',] list2 = ['n','N',] if a in list2:     print 'Quit program,please rerun!' else:     if a in list1:         redList = set()         bullList = set()         while len(redList)<7:             redList.add(random.randint(1,34))         while len(bullList)<1:             bullList.add(random.randint(1,17))         print 'Red balls are:',list(redList),'Blue ball is:',list(bullList)     else:         print 'Only input y or n'