笨办法学Python记录--习题38-40，复习前面，运用list操作函数

#习题38 区分列表和字符串，用到了split（字符串专用函数），join、append、pop（这些是list操作函数）

 ten_things = "Apples Oranges Crows Telephone Liht Sugar"

 print "Wait there is not 10 things in that list, let's fix that."

 stuff=ten_things.split(' ')

 more_stuff = ["Day","Night","Song","Frisbee","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[-1]"
 print stuff[-1]

 print "stuff.pop()"
 print stuff.pop()

 print "' '.join(stuff)"
 print ' '.join(stuff)

 print "'#'.join(stuff[3:5]"
 print '#'.join(stuff[3:5]

 )

结果：

#习题38 区分列表和字符串，同时学者使用split函数
ten_things = "Apples Oranges Crows Telephone Liht Sugar"

print "Wait there is not 10 things in that list, let's fix that."

stuff=ten_things.split(' ')

more_stuff = ["Day","Night","Song","Frisbee","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[-1]"
print stuff[-1]

print "stuff.pop()"
print stuff.pop()

print "' '.join(stuff)"
print ' '.join(stuff)

print "'#'.join(stuff[3:5]"
print '#'.join(stuff[3:5]

)

个人觉得这么使用字典很帅很帅！！

 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_city

 while True:
     print "State?(ENTER to quit)",
     state = raw_input("> ")

     if not state:break
     city_found = cities['_find'](cities,state)
     print city_found

关于字典：字典出现在当索引不好用的时候--字典中的值并没有特殊的顺序，但是都存储在一个特定的键（key）里。key可以是数字、字符串甚至元组。

字典应用：1. 数字电话/地址簿；2. 存储文件修改次数，用文件名作为键；3. 表征游戏键盘的状态，每个键都是由坐标值组成的元组；

dict函数的使用：

>>>d=dict(name='GG', age=32)

>>>d

{'age':32,'name':'GG'}

or

>>>a=[('name','GG'),('age',42)]

>>>d=dict(a)

简单数据库实现：

 people = {'Alice':{'phone':'','addr':'Foo drive 23'},'Beth':{'phone':'','addr':'Bar steet 42'},'Cecil':{'phone':'','addr':'Baz avenue 90'}}
 labels = {'phone':'phone number','addr':'address'}
 name = raw_input('Name: ')
 request=raw_input('phone number(p) or address(a)?')
 if request=='p':
     key = 'phone'
 if request == 'a':
     key = 'addr'
 if name in people:
     print "%s's %s is %s." % (name,labels[key],people[name][key])

深拷贝，浅拷贝

待续