代码

people = 20
cats = 30
dogs = 15if people < cats:#同“def”一样，用“：”表示一个程序块。print ("Too many cats! The world is doomed!")# 同“def”一样，用开头缩进4个来表示这是一个程序块。if people > cats:print ("Not many cats! The world is saved!")if people < dogs:print ("The world is drooled on!")if people > dogs:print ("The world is dry!")dogs += 5 #"+="意为递增if people >= dogs:print ("People are greater than or equal to dogs.")if people <= dogs:print ("People are less than or equal to dogs.")if people == dogs:print ("People are dogs.")if people == dogs or dogs < cats:print ('I\'m end now.')if people == dogs:print (1)
elif People < dogs:print (2)#30题的内容，因为太简单就和26放一起了。虽然“if条件”简单，但是想完成还是要事事关心，多学多看。

问题

1、or 运算：有True，返回true；无True，返回情况如何呢？
2、and 运算：有False，返回false，无Flase，返回情况如何呢？

学到的

1、if 函数应该是很多地方都有用到的比较简单的函数，判断就离不开if。
2、if之后跟随一个布尔值相互比较的算式，可以任何复杂程度。