#!/usr/bin/pythonnumber=23guess=int(input(‘Enter an interger:‘)) #input返回的结果是string类型，需要用int()转化为int类型if guess == number:    print(‘You guessed in.‘)elif guess < number:    print(‘No, it is a little higher than that‘)else:    print(‘No, it is a little lower than that‘)print(‘Done‘)

#!/usr/bin/pythonnumber = 23while True:    guess=int(input(‘Enter an integer:‘))    if guess==number:        print(‘You guessed it‘)        break    elif guess<num:        print(‘No, it is a little higher than that‘)    else:        print(‘No, it is a little lower than that‘)else:#else下的statements是在while的条件为假时执行的，但如果有break,它就不会执行了    print(‘The while loop is over‘)print(‘Done‘)

#!/usr/bin/pythonfor i in range(1,5):    print(i)else:#else下的statements是在for循环结束后执行的，但如果有break,它就不会执行了    print(‘The for loop is over‘)