笨办法学python习题39-40

#习题39 列表的操作
ten_things = "Apples Oranges Crows Telephone Light Sugar"print("Wait there's not 10 things in that list,let's fix that.")stuff = ten_things.split(' ')
more_stuff = ["Day","Night","Song","Firsbee","Corn","Banana","Girl","Boy"]while len(stuff) != 10:next_one = more_stuff.pop()print("Adding:",next_one)stuff.append(next_one)print("There's %d items now." % len(stuff))
print("There we go:",stuff)
print("Let's do some things with stuff.")
print(stuff[1])
print(stuff[-1])
print(stuff.pop())
print(' '.join(stuff))
print('#'.join(stuff[3:5]))

加分习题

1. 将每一个被调用的函数以上述的方式翻译成 Python 实际执行的动作。例如： ' '.join(things) 其实是 join(' ', things) 。

2. 将这两种方式翻译为自然语言。例如， ' '.join(things) 可以翻译成“用 ‘ ‘ 连接(join) things”，而 join(' ', things) 的意思是“为 ‘ ‘ 和 things 调用 join 函数”。这其实是同一件事情。

3. 上网阅读一些关于“面向对象编程(Object Oriented Programming)”的资料。晕了吧？嗯，我以前也是。别担心。你将从这本书学到足够用的关于面向对象编程的基础知识，而以后你还可以慢慢学到更多。

4. 查一下 Python中的 “class” 是什么东西。不要阅读关于其他语言的 “class” 的用法，这会让你更糊涂。

http://www.runoob.com/python3/python3-class.html

5. dir(something) 和 something 的 class 有什么关系？

6. 如果你不知道我讲的是些什么东西，别担心。程序员为了显得自己聪明，于是就发明了 Opject Oriented Programming，简称为 OOP，然后他们就开始滥用这个东西了。如果你觉得这东西太难，你可以开始学一下 “函数编程(functional programming)”。

#习题40 字典
cities = {'CA':'San Francisco','MI':'Detroit','FL':'Jacksonville'}
cities['NY'] = 'New York'
cities['OR'] = 'Portland'def find_city(themap,state):if state in themap:return themap[state]else:return "Not found."
cities['_find'] = find_citywhile True:print("State?(ENTER to quit)",end='')state = input(">")if not state:break# this line is the most important ever! study!city_found = cities['_find'](cities,state)print(city_found)

#习题41：来自Percal 25号行星的哥顿人（Gothons）
from sys import exit
from random import randintdef death():quips = ["You died. You kinda suck at this.","Nice job,you died ...jackass.","Such a luser.","I have a small puppy that's better at this."]print(quips[randint(0,len(quips)-1)])exit(1)def central_corridor():print("The Gothons of Planet Percal #25 have invaded your ship and destroy")print("your entire crew.You are the last surviving member and your last")print("mission is to get the neutron destruct bomb from the Weapons Armory,")print("put it in the bridge,and blow the ship up after getting into an")print("escape pod.")print("\n")print("You're running down the central corridor to the Weapons Armory when")print("a Gothon jumps out, red scaly skin,dark grimy teeth,and evil clown costume")print("flowing around his hate filled body. He's blocking the door to the")print("Armory and about to pull a weapon to blast you.")action = input("> ")if action == "shoot!":print("Quick on the draw you yank out your blaster and fie it at the Gothon.")print("His clown costume is flowing and moving around his body,which throws")print("off your aim. Your laster hits his costume but misses hime entirely. This")print("comletely ruins his brand new costume his mother bought him,which")print("makes him fly into an insane rage and blast you repeatedly in the face until")print("you are dead, Then he eats you.")return 'death'elif action == "dodge!":print("Like a world class boxer you dodge,weave,slip and slide right")print("as the Gothon's blaster cranks a laser past your head.")print("In the middle of your artful dodge your foot slips and you")print("bang your head on the metal wall and pass out.")print("You wake up shortly after only to die as the Gothon stomps on")print("your head and eats you.")return 'death'elif action == "tell a joke":print("Lucky for you they made you learn Gothon instults in the academy.")print("You tell the one Gothon joke you know:")print("Lbhe zbgure vf fb sng,jura fur fvgf nebhaq gurubhfr,fur fvgf nebhaq gur ubhfr.")print("The Gothon stops,tries not to laugh,then busts out laughing and can't move.")print("While he's laughing you run up and shoot him square in the head")print("putting him down, then jump through the Weapon Armory door.")return 'laser_weapon_armory'else:print("DOES NOT COMPUTE!")return 'central_corridor'def laser_weapon_armory():print("You do a dive roll into the Weapon Armory,crouch and scan the room")print("for more Gothons that might be hiding. It's dead quiet, too quiet.")print("You stand up and run to the far side of the and find the")print("neutron bomb in its container. There's a keypad lock on the box")print("and you need the code to get the bomb out. If you get the code")print("wrong 10 times then the lock closes forever and you can't")print("get the bomb. The code is 3 digits.")code = "%d%d%d" % (randint(1,9),randint(1,9),randint(1,9))guess = input("[keypad]> ")guesses = 0while guess != code and guesses < 10:print("BZZZZEDDD!")guesses += 1guess = input("[keypad]> ")if guess == code:print("The container clicks open and the seal breaks,letting gas out.")print("You grab the neutron bomb and run as fast as you can to the")print("bridge where you must place it in the right spot.")return 'the_bridge'else:print("The lock buzzes one last time and then you hear a sickening")print("melting sound as the mechanism is  fused together.")print("You decide to sit there,and finally the Gothons blow up the")print("ship from their ship and you die.")return 'death'
def the_bridge():print("You burst onto the Bridge with the neutron destruct bomb")print("under your arm and surprise 5 Gothons who are trying to")print("take control of the ship. Each of them has an even uglier")print("clown costume than the last. They haven't pulled their")print("weapons out yet,as they see the active bomb under your")print("arm and don't want to set it off.")action = input("> ")if action == "throw the bomb":print("In a panic you throw the bomb at the group of Gothons")print("and make a leap for the door. Right as you drop it a")print("Gothon shoots you right in the back killing you.")print("As you die you see another Gothon frantically try to disarm")print("the bomb.You die knowing they will blow up when")print("it goes off.")return 'death'elif action =="slowly p;ace the bomb":print("You point your blaster at the bomb under your arm")print("and the Gothons put their hands up and start to sweat.")print("You inch backward to the door,open it,and then carefuuly")print("place the bomb on the floor,pointing your blaster at it.")print("You then jump back through the door,punch the close button")print("and blast the lock so the Goths can't get out.")print("Now that the bomb is placed you run to the escape pod to")print("get off this tin can.")return 'escape_pod'else:print("DOES NOT COMPUTE!")return "the_bridge"
def escape_pod():print("You rush through the ship desperately trying to make it to")print("the escape pod before the whole ship explodes. It seems like")print("hardly any Gothons are on the ship, so your run is clear of")print("interference.You get to the chamber with the escape pods,and")print("now need to pick one to take. Some of them could be damaged")print("but you don't have time to look. There's 5 pods, which one")print("do you take?")good_pod = randint(1,5)guess = input("[pod #]> ")if int(guess) != good_pod:print("You jump into pod%s and hit the eject button."% guess)print("The pod escapes out into the void of space,then")print("implodes as the hull ruptures,crushing your body")print("into jam jelly.")return 'death'else:print("You jump into pod%s and hit the eject button."%guess)print("The pod easily slides out into space heading to")print("the planet below. As it flies to the planet,you look")print("back and see your ship implode then explode like a")print("bright star,taking out the Gothon ship at the same")print("time.You won!")exit(0)
ROOMS = {'death':death,'central_corridor':central_corridor,'laser_weapon_armory':laser_weapon_armory,'the_bridge':the_bridge,'escape_pod':escape_pod
}
def runner(map,start):next = startwhile True:room = map[next]print("\n--------")next = room()
runner(ROOMS,'central_corridor')

C:\Users\Aminiy\PycharmProjects\untitled\venv\Scripts\python.exe C:/Users/Aminiy/PycharmProjects/untitled/ex41.py

--------
The Gothons of Planet Percal #25 have invaded your ship and destroy
your entire crew.You are the last surviving member and your last
mission is to get the neutron destruct bomb from the Weapons Armory,
put it in the bridge,and blow the ship up after getting into an
escape pod.

You're running down the central corridor to the Weapons Armory when
a Gothon jumps out, red scaly skin,dark grimy teeth,and evil clown costume
flowing around his hate filled body. He's blocking the door to the
Armory and about to pull a weapon to blast you.
> tell a joke
Lucky for you they made you learn Gothon instults in the academy.
You tell the one Gothon joke you know:
Lbhe zbgure vf fb sng,jura fur fvgf nebhaq gurubhfr,fur fvgf nebhaq gur ubhfr.
The Gothon stops,tries not to laugh,then busts out laughing and can't move.
While he's laughing you run up and shoot him square in the head
putting him down, then jump through the Weapon Armory door.

--------
You do a dive roll into the Weapon Armory,crouch and scan the room
for more Gothons that might be hiding. It's dead quiet, too quiet.
You stand up and run to the far side of the and find the
neutron bomb in its container. There's a keypad lock on the box
and you need the code to get the bomb out. If you get the code
wrong 10 times then the lock closes forever and you can't
get the bomb. The code is 3 digits.
[keypad]> 123
BZZZZEDDD!
[keypad]> 234
BZZZZEDDD!
[keypad]> 345
BZZZZEDDD!
[keypad]> 456
BZZZZEDDD!
[keypad]> 567
BZZZZEDDD!
[keypad]> 678
BZZZZEDDD!
[keypad]> 789
BZZZZEDDD!
[keypad]> 384
BZZZZEDDD!
[keypad]> 764
BZZZZEDDD!
[keypad]> 354
BZZZZEDDD!
[keypad]> 263
The lock buzzes one last time and then you hear a sickening
melting sound as the mechanism is fused together.
You decide to sit there,and finally the Gothons blow up the
ship from their ship and you die.

--------
I have a small puppy that's better at this.

Process finished with exit code 1

加分习题

1. 解释一下返回至下一个房间的工作原理。

2. 创建更多的房间，让游戏规模变大。

3. 除了让每个函数打印自己以外，再学习一下“文档字符串(doc strings)”式的注解。看看你能不能将房间描述写成文档注解，然后修改运行它的代码，让它把文档注解打印出来。

4. 一旦你用了文档注解作为房间描述，你还需要让这个函数打印出用户提示吗？试着让运行函数的代码打出用户提示来，然后将用户输入传递到各个函数。你的函数应该只是一些 if 语句组合，将结果打印出来，并且返回下一个房间。

5. 这其实是一个小版本的“有限状态机(finite state machine)”，找资料阅读了解一下，虽然你可能看不懂，但还是找来看看吧。

#习题41：来自Percal 25号行星的哥顿人（Gothons）
from sys import exit
from random import randint
class Game(object):def __init__(self,start):self.quips = ["You died. You kinda suck at this.","Nice job,you died ...jackass.","Such a luser.","I have a small puppy that's better at this."]self.start = startdef play(self):next = self.startwhile True:print("\n--------------")room = getattr(self,next)next = room()def death(self):print(self.quips[randint(0,len(self.quips)-1)])exit(1)def central_corridor(self):print("The Gothons of Planet Percal #25 have invaded your ship and destroy")print("your entire crew.You are the last surviving member and your last")print("mission is to get the neutron destruct bomb from the Weapons Armory,")print("put it in the bridge,and blow the ship up after getting into an")print("escape pod.")print("\n")print("You're running down the central corridor to the Weapons Armory when")print("a Gothon jumps out, red scaly skin,dark grimy teeth,and evil clown costume")print("flowing around his hate filled body. He's blocking the door to the")print("Armory and about to pull a weapon to blast you.")action = input("> ")if action == "shoot!":print("Quick on the draw you yank out your blaster and fie it at the Gothon.")print("His clown costume is flowing and moving around his body,which throws")print("off your aim. Your laster hits his costume but misses hime entirely. This")print("comletely ruins his brand new costume his mother bought him,which")print("makes him fly into an insane rage and blast you repeatedly in the face until")print("you are dead, Then he eats you.")return 'death'elif action == "dodge!":print("Like a world class boxer you dodge,weave,slip and slide right")print("as the Gothon's blaster cranks a laser past your head.")print("In the middle of your artful dodge your foot slips and you")print("bang your head on the metal wall and pass out.")print("You wake up shortly after only to die as the Gothon stomps on")print("your head and eats you.")return 'death'elif action == "tell a joke":print("Lucky for you they made you learn Gothon instults in the academy.")print("You tell the one Gothon joke you know:")print("Lbhe zbgure vf fb sng,jura fur fvgf nebhaq gurubhfr,fur fvgf nebhaq gur ubhfr.")print("The Gothon stops,tries not to laugh,then busts out laughing and can't move.")print("While he's laughing you run up and shoot him square in the head")print("putting him down, then jump through the Weapon Armory door.")return 'laser_weapon_armory'else:print("DOES NOT COMPUTE!")return 'central_corridor'def laser_weapon_armory(self):print("You do a dive roll into the Weapon Armory,crouch and scan the room")print("for more Gothons that might be hiding. It's dead quiet, too quiet.")print("You stand up and run to the far side of the and find the")print("neutron bomb in its container. There's a keypad lock on the box")print("and you need the code to get the bomb out. If you get the code")print("wrong 10 times then the lock closes forever and you can't")print("get the bomb. The code is 3 digits.")code = "%d%d%d" % (randint(1,9),randint(1,9),randint(1,9))guess = input("[keypad]> ")guesses = 0while guess != code and guesses < 10:print("BZZZZEDDD!")guesses += 1guess = input("[keypad]> ")if guess == code:print("The container clicks open and the seal breaks,letting gas out.")print("You grab the neutron bomb and run as fast as you can to the")print("bridge where you must place it in the right spot.")return 'the_bridge'else:print("The lock buzzes one last time and then you hear a sickening")print("melting sound as the mechanism is  fused together.")print("You decide to sit there,and finally the Gothons blow up the")print("ship from their ship and you die.")return 'death'def the_bridge(self):print("You burst onto the Bridge with the neutron destruct bomb")print("under your arm and surprise 5 Gothons who are trying to")print("take control of the ship. Each of them has an even uglier")print("clown costume than the last. They haven't pulled their")print("weapons out yet,as they see the active bomb under your")print("arm and don't want to set it off.")action = input("> ")if action == "throw the bomb":print("In a panic you throw the bomb at the group of Gothons")print("and make a leap for the door. Right as you drop it a")print("Gothon shoots you right in the back killing you.")print("As you die you see another Gothon frantically try to disarm")print("the bomb.You die knowing they will blow up when")print("it goes off.")return 'death'elif action =="slowly p;ace the bomb":print("You point your blaster at the bomb under your arm")print("and the Gothons put their hands up and start to sweat.")print("You inch backward to the door,open it,and then carefuuly")print("place the bomb on the floor,pointing your blaster at it.")print("You then jump back through the door,punch the close button")print("and blast the lock so the Goths can't get out.")print("Now that the bomb is placed you run to the escape pod to")print("get off this tin can.")return 'escape_pod'else:print("DOES NOT COMPUTE!")return "the_bridge"def escape_pod(self):print("You rush through the ship desperately trying to make it to")print("the escape pod before the whole ship explodes. It seems like")print("hardly any Gothons are on the ship, so your run is clear of")print("interference.You get to the chamber with the escape pods,and")print("now need to pick one to take. Some of them could be damaged")print("but you don't have time to look. There's 5 pods, which one")print("do you take?")good_pod = randint(1,5)guess = input("[pod #]> ")if int(guess) != good_pod:print("You jump into pod%s and hit the eject button."% guess)print("The pod escapes out into the void of space,then")print("implodes as the hull ruptures,crushing your body")print("into jam jelly.")return 'death'else:print("You jump into pod%s and hit the eject button."%guess)print("The pod easily slides out into space heading to")print("the planet below. As it flies to the planet,you look")print("back and see your ship implode then explode like a")print("bright star,taking out the Gothon ship at the same")print("time.You won!")exit(0)
a_game = Game("central_corridor")
a_game.play()
# ROOMS = {
#     'death':death,
#     'central_corridor':central_corridor,
#     'laser_weapon_armory':laser_weapon_armory,
#     'the_bridge':the_bridge,
#     'escape_pod':escape_pod
# }
# def runner(map,start):
#     next = start
#     while True:
#         room = map[next]
#         print("\n--------")
#         next = room()
# runner(ROOMS,'central_corridor')

C:\Users\Aminiy\PycharmProjects\untitled\venv\Scripts\python.exe C:/Users/Aminiy/PycharmProjects/untitled/ex41t.py

--------------
The Gothons of Planet Percal #25 have invaded your ship and destroy
your entire crew.You are the last surviving member and your last
mission is to get the neutron destruct bomb from the Weapons Armory,
put it in the bridge,and blow the ship up after getting into an
escape pod.

--------------
You do a dive roll into the Weapon Armory,crouch and scan the room
for more Gothons that might be hiding. It's dead quiet, too quiet.
You stand up and run to the far side of the and find the
neutron bomb in its container. There's a keypad lock on the box
and you need the code to get the bomb out. If you get the code
wrong 10 times then the lock closes forever and you can't
get the bomb. The code is 3 digits.
[keypad]> 111
BZZZZEDDD!
[keypad]> 3334
BZZZZEDDD!
[keypad]> 555
BZZZZEDDD!
[keypad]> 666
BZZZZEDDD!
[keypad]> 7
BZZZZEDDD!
[keypad]> 1
BZZZZEDDD!
[keypad]> 2
BZZZZEDDD!
[keypad]> 3
BZZZZEDDD!
[keypad]> 4
BZZZZEDDD!
[keypad]> 5
BZZZZEDDD!
[keypad]> 6
The lock buzzes one last time and then you hear a sickening
melting sound as the mechanism is fused together.
You decide to sit there,and finally the Gothons blow up the
ship from their ship and you die.

--------------
You died. You kinda suck at this.

Process finished with exit code 1

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