习题27-33.md

print(3!=4 and not ("testing"!="test" or "python"=="python")) 

False

people = 20
cats = 30
dogs = 15

if people<cats:
    print("Too many cats!The word is doomed!")

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

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.")
    

Too many cats!The word is doomed!
The world is dry!
People are greater than or equal to dogs.
People are less than or equal to dogs.
People are dogs.

people = 30
cars = 40
buses = 15

if cars > people:
    print("We should take the cars.")
elif cars < people:
    print("we should not take the cars.")
else:
    print("We can't decide")

if buses > cars:
    print("That's too many buses.")
elif(buses < cars):
    print("Maybe we could take the buses.")
else:
    print("We still can't decide.")

if people > buses:
    print("Alright,Let's just take the buses.")
else:
    print("Fine,let's stay home then.")

We should take the cars.
Maybe we could take the buses.
Alright,Let's just take the buses.

print("You enter a dark room with two doors. Do you go through door #1 or door #2?")

door = input("> ")

if door == "1":
    print("There's a giant bear here eating a cheese cake.What do you do?")
    print("1.Take the cake.")
    print("2.Scream at the bear.")
    
    bear = input("> ")
    
    if bear == "1":
        print("The bear eats your face off.Good job!")
    elif bear =="2":
        print("The bear eats your legs off.Good job!")
    else:
        print("Well,doing %s is probably better. Bear runs away."%bear)
        
elif door == "2":
    print("You stare into the endless abyss at Cthulhu's retina.")
    print("1.Blueberries.")
    print("2.Yellow jacket clothespins.")
    print("3.Understanding revolvers yelling melodies.")
    
    insanity = input("> ")
    if insanity == "1"or insanity == "2":
        print("Your  body survives powered by a mind of jello. Good job!")
    else:
        print("You stumble around and fall on a knife and die. Good job!")
        

You enter a dark room with two doors. Do you go through door #1 or door #2?
> 1
There's a giant bear here eating a cheese cake.What do you do?
1.Take the cake.
2.Scream at the bear.
> 1
The bear eats your face off.Good job!

#创建列表
hairs = ['brown','blond','red']
eyes = ['brown','blond','red']
weight = [1,2,3,4]

the_count = [1,2,3,4,5]
fruits = ['apple','oranges','pears','apricots']
change = [1,'pennies',2,'dimes',3,'quarters']

for fruit in fruits:
    print("A fruit of type:%s"%fruit)

for number in the_count:
    print("This is count %d"%number)
    
for i in change:
    print("I got %r"%i)
  
elements = []

for i in range(0,6):
    print("Adding %d to the list."%i)
    elements.append(i)
  
for i in elements:
    print("Elements was:%d"%i)

A fruit of type:apple
A fruit of type:oranges
A fruit of type:pears
A fruit of type:apricots
This is count 1
This is count 2
This is count 3
This is count 4
This is count 5
I got 1
I got 'pennies'
I got 2
I got 'dimes'
I got 3
I got 'quarters'
Adding 0 to the list.
Adding 1 to the list.
Adding 2 to the list.
Adding 3 to the list.
Adding 4 to the list.
Adding 5 to the list.
Elements was:0
Elements was:1
Elements was:2
Elements was:3
Elements was:4
Elements was:5

#while循环
i = 0
numbers = []

while i < 5:
    print("At the top i is %d"%i)
    numbers.append(i)
    
    i+=1
    print("Numbers now:",numbers)
    print("At the bttom i is %d"%i)
    

print("The numbers:")

for num in numbers:
    print(num)

At the top i is 0
Numbers now: [0]
At the bttom i is 1
At the top i is 1
Numbers now: [0, 1]
At the bttom i is 2
At the top i is 2
Numbers now: [0, 1, 2]
At the bttom i is 3
At the top i is 3
Numbers now: [0, 1, 2, 3]
At the bttom i is 4
At the top i is 4
Numbers now: [0, 1, 2, 3, 4]
At the bttom i is 5
The numbers:
0
1
2
3
4