练习30.else和if
people = input("people?")
cars = input("cars?")
trucks = input("trucks?")
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 trucks > cars:
print("that's we could take the trucks.")
elif trucks < cars:
print("maybe we could take the trucks.")
else:
print("we still can't decide")
if people > trucks:
print("alright, let's just take the trucks.")
else:
print("fine, let's stay home then.") 练习31.作出决定if-elif-else
print("you enter a dark room with two doors.do you go through door #1 or door #2?")
door = input("1 or 2?")
if door == "1":
print("there's a giant bear here eating a cheese cake.what do you do?")
print("1.thake the cake.\n2.scream at the bear.")
bear = input("1 or 2?")
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,bear runs away")
elif door == "2":
print("you can see:\n1blueberries.\n2yellow jacket.\n3a key")
answer = input("please...")
if answer == "1" or answer == "2":
print("you can go")
else:
print("drop the hole")
else:
print("that's only a dream.good luck") 练习32.循环和列表[,]
the_count =
fruits = ['apple','oranges','pears','apricots']
change =
#第一种列表for循环
for number in the_count:
print('this is count %d'%number)
#同上
for fruit in fruits:
print("a fruit of type: %s"%fruit)
#通过%r循环输出混合列表
for i in change:
print('I got %r'%i)
elements = []#空列表
for i in range(0,6):#0,1,2,3,4,5循环输出
print("adding %d to the list"%i)
elements.append(i)#添加到列表
for i in elements:#循环输出列表
print("element was: %d"%i)
练习33.while循环
def print_number(n):
i = 0
while i<n:
print("at the top i is %d"%i)
numbers.append(i)
i += 1
print("number now:",numbers)
print("at the bottom i is %d"%i)
numbers = []
print_number(6)
print("the numbers:")
for num in numbers:
print(num) 练习38.列表操作
ten_things = "Apples Oranges Crows Telephon Light Sugar"
print("wait there are not 10 tings in that list .let's fix that")
stuff = ten_things.split(' ')#按空格分开
more_stuff = ['day','night','song','frisbee','corn','banana','girl','boy']
while len(stuff)!=10:#while循环，直到stuff的长度为10
next_one = more_stuff.pop()#取出more_stuff的最后一个元素
print("adding:",next_one)
stuff.append(next_one)#添加到stuff里
print('there are %d items noww.'%len(stuff))
print("there we go:",stuff)
print(stuff)#stuff的第二个元素
print(stuff[-1])#stuff的最后一个元素
print(stuff.pop())#stuff的最后一个元素
print(' '.join(stuff))#将stuff里的元素用户空格连接
print('#'.join(stuff))#第三、第四个元素用户#号连接
#列表是常用的数据结构之一，是数据的有序列表
练习39.字典，可爱的字典{：，}
states = {
'Oregon':'OR',
'Florida':'FL',
'Califonia':'CA',
'New York':'NY',
'Michigan':'MI'}
cities = {
'CA':'San Francisco',
'MI':'Detroit',
'FL':'Jacksonville'}
#添加数据
cities['NY'] = 'New York'
cities['OR'] = 'Portland'
#显示一些城市
print('-'*10)
print('NY State has:',cities['NY'])
print('OR State has:',cities['OR'])
#显示一些州
print('-'*10)
print("Michigan's abbreviation is:",states['Michigan'])
print("Florida's abbreviation is:",states['Florida'])
#用州 然后城市
print('-'*10)
print("Michigan has:",cities])
#显示每一个州、缩写
for abbrev,city in cities.items():
print("%s has the city %s"%(abbrev,city))
#一次做两件事情
print('-'*10)
for state,abbrev in states.items():
print("%s state is abbreviated %s and has city %s"%(state,abbrev,cities))
state = states.get('Texas')
if not state:
print("Sorry,no Texas.")
city = cities.get('Tx','Does not exist')
print("the city fot the state 'TX' is:%s"%city)
#字典是另一常用数据结构。如果你要用一个非数字的key，使用 dict ，如果你需要有序的东西，使用 list。 练习40.模块，类，对象
#类的简单工作原理：
类是用来创建迷你模块的蓝本或定义实例化是如何创建这些小模块，并在同一时间将其导入。
实例化仅仅是指通过类创建一个对象。
由此产生的迷你模块被称为对象，你可以将其分配给一个变量，让它开始运行
class Song(object):#定义类
def __init__(self,lyrics):
self.lyrics = lyrics
def sing_me_a_song(self):
for line in self.lyrics:
print(line)
happy_bday = Song(["Happy birthday to you",
"I don't want to get sued",
"so I'll stop right there"])#实例化对象
bulls_on_parade = Song(["They rally around the family",
"With pockets full of shells"])#实例化对象
happy_bday.sing_me_a_song()#调用函数
bulls_on_parade.sing_me_a_song()#调用函数 欧小麦 发表于 2018-8-14 21:55
练习20.函数和文件
from sys import argv
2023年9月12日打卡
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