标签:锻炼 有趣的 void 学习 alt control 看到了 each 资料
你在上一节中发现 dict 的秘密功能了吗?你可以解释给自己吗?让我来给你解释一下,顺便和你自己的理解对比看有什么不同。这里是我们要讨论的代码:
cities[‘_find‘] = find_city city_found = cities[‘_find‘](cities, state)
你要记住一个函数也可以作为一个变量,``def find_city`` 比如这一句创建了一个你可以在任何地方都能使用的变量。在这段代码里,我们首先把函数 find_city 放到叫做 cities 的字典中,并将其标记为 ‘_find‘。 这和我们将州和市关联起来的代码做的事情一样,只不过我们在这里放了一个函数的名称。
好了,所以一旦我们知道 find_city 是在字典中 _find 的位置,这就意味着我们可以去调用它。第二行代码可以分解成如下步骤:
我再教你一个小技巧。如果你倒着阅读的话,代码可能会变得更容易理解。让我们来试一下,一样是那行:
还有一种方法读它,这回是“由里向外”。
数十年的编程下来,我在读代码的过程中已经用不到上面的三种方法了。我只要瞟一眼就能知道它的意思。甚至给我一整页的代码,我也可以一眼瞄出里边的 bug 和错误。这样的技能是花了超乎常人的时间和精力才锻炼得来的。在磨练的过程中,我学会了下面三种读代码的方法,它们是用户几乎所有的编程语言:
下次碰到难懂的语句时,你可以试试这三种方法。
现在我们来写这次的练习,写完后再过一遍,这节习题其实挺有趣的。
1 from sys import exit 2 from random import randint 3 4 def death(): 5 quips = ["You died. You kinda suck at this.", 6 "Nice job, you died ...jackass.", 7 "Such a luser.", 8 "I have a small puppy that‘s better at this."] 9 10 print quips[randint(0, len(quips)-1)] 11 exit(1) 12 13 14 def central_corridor(): 15 print "The Gothons of Planet Percal #25 have invaded your ship and destroyed" 16 print "your entire crew. You are the last surviving member and your last" 17 print "mission is to get the neutron destruct bomb from the Weapons Armory," 18 print "put it in the bridge, and blow the ship up after getting into an " 19 print "escape pod." 20 print "\n" 21 print "You‘re running down the central corridor to the Weapons Armory when" 22 print "a Gothon jumps out, red scaly skin, dark grimy teeth, and evil clown costume" 23 print "flowing around his hate filled body. He‘s blocking the door to the" 24 print "Armory and about to pull a weapon to blast you." 25 26 action = raw_input("> ") 27 28 if action == "shoot!": 29 print "Quick on the draw you yank out your blaster and fire it at the Gothon." 30 print "His clown costume is flowing and moving around his body, which throws" 31 print "off your aim. Your laser hits his costume but misses him entirely. This" 32 print "completely ruins his brand new costume his mother bought him, which" 33 print "makes him fly into an insane rage and blast you repeatedly in the face until" 34 print "you are dead. Then he eats you." 35 return ‘death‘ 36 37 elif action == "dodge!": 38 print "Like a world class boxer you dodge, weave, slip and slide right" 39 print "as the Gothon‘s blaster cranks a laser past your head." 40 print "In the middle of your artful dodge your foot slips and you" 41 print "bang your head on the metal wall and pass out." 42 print "You wake up shortly after only to die as the Gothon stomps on" 43 print "your head and eats you." 44 return ‘death‘ 45 46 elif action == "tell a joke": 47 print "Lucky for you they made you learn Gothon insults in the academy." 48 print "You tell the one Gothon joke you know:" 49 print "Lbhe zbgure vf fb sng, jura fur fvgf nebhaq gur ubhfr, fur fvgf nebhaq gur ubhfr." 50 print "The Gothon stops, tries not to laugh, then busts out laughing and can‘t move." 51 print "While he‘s laughing you run up and shoot him square in the head" 52 print "putting him down, then jump through the Weapon Armory door." 53 return ‘laser_weapon_armory‘ 54 55 else: 56 print "DOES NOT COMPUTE!" 57 return ‘central_corridor‘ 58 59 def laser_weapon_armory(): 60 print "You do a dive roll into the Weapon Armory, crouch and scan the room" 61 print "for more Gothons that might be hiding. It‘s dead quiet, too quiet." 62 print "You stand up and run to the far side of the room and find the" 63 print "neutron bomb in its container. There‘s a keypad lock on the box" 64 print "and you need the code to get the bomb out. If you get the code" 65 print "wrong 10 times then the lock closes forever and you can‘t" 66 print "get the bomb. The code is 3 digits." 67 code = "%d%d%d" % (randint(1,9), randint(1,9), randint(1,9)) 68 guess = raw_input("[keypad]> ") 69 guesses = 0 70 71 while guess != code and guesses < 10: 72 print "BZZZZEDDD!" 73 guesses += 1 74 guess = raw_input("[keypad]> ") 75 76 if guess == code: 77 print "The container clicks open and the seal breaks, letting gas out." 78 print "You grab the neutron bomb and run as fast as you can to the" 79 print "bridge where you must place it in the right spot." 80 return ‘the_bridge‘ 81 else: 82 print "The lock buzzes one last time and then you hear a sickening" 83 print "melting sound as the mechanism is fused together." 84 print "You decide to sit there, and finally the Gothons blow up the" 85 print "ship from their ship and you die." 86 return ‘death‘ 87 88 89 def the_bridge(): 90 print "You burst onto the Bridge with the neutron destruct bomb" 91 print "under your arm and surprise 5 Gothons who are trying to" 92 print "take control of the ship. Each of them has an even uglier" 93 print "clown costume than the last. They haven‘t pulled their" 94 print "weapons out yet, as they see the active bomb under your" 95 print "arm and don‘t want to set it off." 96 97 action = raw_input("> ") 98 99 if action == "throw the bomb": 100 print "In a panic you throw the bomb at the group of Gothons" 101 print "and make a leap for the door. Right as you drop it a" 102 print "Gothon shoots you right in the back killing you." 103 print "As you die you see another Gothon frantically try to disarm" 104 print "the bomb. You die knowing they will probably blow up when" 105 print "it goes off." 106 return ‘death‘ 107 108 elif action == "slowly place the bomb": 109 print "You point your blaster at the bomb under your arm" 110 print "and the Gothons put their hands up and start to sweat." 111 print "You inch backward to the door, open it, and then carefully" 112 print "place the bomb on the floor, pointing your blaster at it." 113 print "You then jump back through the door, punch the close button" 114 print "and blast the lock so the Gothons can‘t get out." 115 print "Now that the bomb is placed you run to the escape pod to" 116 print "get off this tin can." 117 return ‘escape_pod‘ 118 else: 119 print "DOES NOT COMPUTE!" 120 return "the_bridge" 121 122 def escape_pod(): 123 print "You rush through the ship desperately trying to make it to" 124 print "the escape pod before the whole ship explodes. It seems like" 125 print "hardly any Gothons are on the ship, so your run is clear of" 126 print "interference. You get to the chamber with the escape pods, and" 127 print "now need to pick one to take. Some of them could be damaged" 128 print "but you don‘t have time to look. There‘s 5 pods, which one" 129 print "do you take?" 130 131 good_pod = randint(1,5) 132 guess = raw_input("[pod #]> ") 133 134 135 if int(guess) != good_pod: 136 print "You jump into pod %s and hit the eject button." % guess 137 print "The pod escapes out into the void of space, then" 138 print "implodes as the hull ruptures, crushing your body" 139 print "into jam jelly." 140 return ‘death‘ 141 else: 142 print "You jump into pod %s and hit the eject button." % guess 143 print "The pod easily slides out into space heading to" 144 print "the planet below. As it flies to the planet, you look" 145 print "back and see your ship implode then explode like a" 146 print "bright star, taking out the Gothon ship at the same" 147 print "time. You won!" 148 exit(0) 149 150 151 ROOMS = { 152 ‘death‘: death, 153 ‘central_corridor‘: central_corridor, 154 ‘laser_weapon_armory‘: laser_weapon_armory, 155 ‘the_bridge‘: the_bridge, 156 ‘escape_pod‘: escape_pod 157 } 158 159 160 def runner(map, start): 161 next = start 162 163 while True: 164 room = map[next] 165 print "\n--------" 166 next = room() 167 168 runner(ROOMS, ‘central_corridor‘)
代码不少,不过还是从头写完吧。确认它能运行,然后玩一下看看。
我玩起来时这样的:
1.
标签:锻炼 有趣的 void 学习 alt control 看到了 each 资料
原文地址:http://www.cnblogs.com/yllinux/p/7624796.html