笨办法学python ex29-35

ex29

# -*- coding: utf-8 -*-

people = 20
cats = 30
dogs = 15

if people < cats:
    print "Too many cats! The world 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 # dogs = dogs + 5 ;x += y ,x = x + y

if people >= dogs:
    print "People are greater than equal to dogs."

if people <= dogs:
    print "People are less than equal to dogs."

if people == dogs:
    print "People are dogs."

asd = 1 
qwe = 2
if asd != qwe:
    print "Oh!"

ex30
不论if 还是def 行尾 ‘:’ 的作用是告诉Python接下来将要创建一个新的代码区段，接下来的区段要有缩进

# -*- coding: utf-8 -*-
a = int(raw_input("please give me a number"))
b = int(raw_input("please give me a letter"))
print a + b
people = 5
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 "Mayble we could take the buses."
else:
    print "We still can't decide."

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

if people > cars and buses > cars:
    print "Cars are the leastest."
else:
    print "That's not right."


a = int(raw_input("please wirte a number."))# raw_input 可以接受任何类型，会把他们转成字符串类型输出。
if a <= 60:
    print "don't pass."
elif a <= 80:
    print "Oh! you're good." # else if在满足一个条件后，会直接输出，不再继续运行; 即只会运行它碰到的第一个是True 的区块
elif a <= 90:
    print  "Nice."
else:
    print "Perfect" #int() 变成数字

else if在满足一个条件后，会直接输出，不再继续运行; 即只会运行它碰到的第一个是True 的区块

ex31

# -*- coding: utf-8 -*-

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

door = raw_input(">")
# 判断数字在某个区间中，1 < x < 10 or x in range(1, 10)
if door == "1":
    print "There's a gaint bear eating a cheese cake. What do you do?"
    print "1. Take the cakes."
    print "2. Scream at the bear."

    bear = raw_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 "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 = raw_input(">")
    if insanity == "1" or insanity == "2":
        print "Your body survives powered by a mind of jello. Good job!"
    else:
        print "The insanity rots your eyes into a pool of muck. Good job!"

else:
    print "You stumble around and fall on a knife and die. Good job!"

ex32

# coding=utf-8

the_count = [1,2,3,4,5]
fruits = ['apples', 'oranges', 'pears', 'apricots']
change = [1, 'apples', 2, 'orange', 3, 'pears', 4, 'apricots', 5]

#this first kind of for-loop goes through a list.
for number in the_count:
    print "This is count %d"% number

#same as above
for fruit in fruits:
    print "A fruit of type: %s." %fruit

# also we can go through mixed lists too
# notice we have to use %r since we don't know what's in it 
for i in change:
    print "I got %r." % i

# we can also build lists, first start with an empty one
elements = []

# then use the function to do 0 to 5 counts
for i in range(0,6):
    print "Adding %d to the list." % i
    #append is a function that lists undrestand 
    elements.append(i)

#now we can print them out too
for i in elements:
    print "Element was: %d." %i 

range 函数

range(1,5) #从1到5，不包含5
range(1,5,2)#从1到5，间隔2，不包含5
range(5) #从0到5，不包含5

#array = [1, 2, 5, 3, 6, 8, 4]
#>>> array[1:] 列出1以后的，从1开始
#>>>array[:-1] 列出-1 之前的，不包括-1
#>>>array[::2]
#[1, 5, 6, 4]
#>>> array[2::]
#[5, 3, 6, 8, 4]
#>>> array[::3]
#[1, 3, 4]
#>>> array[::-1]
#[4, 8, 6, 3, 5, 2 , 1]

#创建二维列表
# [[1,2],[4,5]]

array = [1,2,3，4]
'''这里讲列表本身并不包含数据1,2,3,4 而是包含变量array[0],array[1],array[2],array[3]

所以在del时，要del array[2]，下几篇细讲

ex33
oridinal 有序，以1开始；cardinal 随机选取，以0开始 基数 = 序数-1
from sys import exit
exit(1) 表示程序发生了错误
exit(0) 表示程序是正常退出

# coding=utf-8
# oridinal 有序，以1开始；cardinal 随机选取，以0开始 基数 = 序数-1
# from sys import exit 
# exit(1) 表示程序发生了错误
# exit(0) 表示程序是正常退出

i = 0
numbers = []

while i < 6:
    print "At the top i is %d."% i
    numbers.append(i)

    i += 1
    print "Numbers now:", numbers
    print "At the bottom i is %d" %i

print "The numbers:"

for num in numbers:
    print num

x = int(raw_input('>'))

def print_numbers(x):
    i = 0
    numbers = []

    while i < x:
        numbers.append(i)
        i += 1
    print numbers 

print_numbers(x)

ex35

from sys import exit
# from sys import exit 加载退出项
def gold_room():
    print "This room is full of gold. How much do you take?"

    next = int(raw_input(">"))
    if 0 in next or 1 in next:
        how_much = int(next)
    else:
        dead("Man, you're not greedy, you win!")

    if how_much < 50:
        print "Nice, you're not greedy, you win!"
        exit(0)
    else:
        dead("You greedy bastard!")

def bear_rooom():
    print "There is a bear here."
    print "The bear has a bunch of honey."
    print "The fat bear is in front of another door."
    print "How are you going to the bear?"
    bear_move = False

    while True:
        next = raw_input(">")

        if next == "take honey":
            dead("The bear looks at you then slaps your face off.")
        elif next == "taunt bear" and not bear_move:
            print "The bear has moved from the door. You can go through it now."
            bear_move = True 
        elif next == "taunt bear" and bear_move:
            dead("The bear gets pissed off and chews your leg off.")
        elif next == "open door" and bear_move: 
            gold_room()
        else:
            print "I got no idea what that means."

def cthulhu_room():
    print "Here you see the grear evil Cthulhu."
    print "He, it, whatever stares at you and you go insane."
    print "Do you flee for your life or your head?"

    next = raw_input(">")
    if  "flee" in next :
        start()
    elif "head" in next:
        dead("Well that was tasty!")
    else:
        cthulhu_room()  

def dead(why):
    print why, "Good job!"
    exit(0)

def start():
    print "You are in a dark room."
    print "There is a door to your right and left."
    print "Which one do you take?"

    next = raw_input(">")

    if next == "left" :
        bear_rooom()
    elif next == "right":
        cthulhu_room()
    else:
        dead("You stumble around the room until you starve.")

start()