python第四篇-if

#!/usr/bin/pythonnumber = 23guess = int(input('Enter an integer : '))if guess == number:    print('Congratulations,you guessed it.')    print('(but you do not win any prizes)')elif guess < number:    print('No,it is a little higer than that')else:    print('No,it is a little lower than that.')print('done')

结果：

[(8) root@Fedora~/Note/python]#./if.py Enter an integer : 3No,it is a little higer than thatdone[(9) root@Fedora~/Note/python]#./if.py Enter an integer : 23Congratulations,you guessed it.(but you do not win any prizes)done[(10) root@Fedora~/Note/python]#./if.py Enter an integer : 45No,it is a little lower than that.done

#首先input是接收用户的输入，并加上提示字符'Enter an integer',
#之后就是关于if的函数块的使用，这里的if的使用不需要加括号，但是判断之后必须加上 ： 冒号，
#然后下面属于if的语句要tab键开头，这样解释器就默认为if的语句。
#最后的那个print，既不属于else也不属于if，所以是顶头开始，这样最后不管if执行还是else执行，这句话都会执行
#