Python's first basic Tutorial 4 Chapter Dictionary: When the index does not work also

Python 2.7.5 (default, May, 22:43:36) [MSC v.1500 + bit (Intel)] on Win32type "copyright", "credits" or "license ( "For more information. #4.1 Dictionary use >>> names=[' Alice ', ' Beth ', ' Cecil ', ' Dee-dee ', ' Earl ']>>> numbers=[ ' 2341 ', ' 9102 ', ' 3158 ', ' 042 ', ' 5551 ']>>> names=[' Alice ', ' Beth ', ' Cecil ', ' Dee-dee ', ' Earl ']>>> numbers=[' 2341 ', ' 9102 ', ' 3158 ', ' 042 ', ' 5551 ']>>> numbers[names.index (' Cecil ')] ' 3158 ' >>> 014298 >>> 0912syntaxerror:invalid token>>> 0812syntaxerror:invalid token#4.2 Creating and using dictionaries >>> phonebook={' Alice ': ' 2341 ', ' Beth ': ' 9102 ', ' Cecil ': ' 3258 '}>>> phonebook[' Cecil '] ' 3258 ' #4.2.1 Dict functions > >> items=[(' name ', ' Gumby '), (' Age ', "]>>>") d = dict (items) >>> d{' age ': "The ' name ': ' Gumby '}> >> d[' name '] ' Gumby ' >>> d = dict (name= ' Gumby ', age=42) >>> d{' age ':, ' name ': ' Gumby '} #4.2.2 The Basic dictionary Operation #len (d) Returns the number of items in D (key-value pairs) #d[k] Returns the value associated to the key K #d[k]=v the value V is associated to the key K #del D[k] Delete the item with the key K #k in D checks if D includes the key KThe type of the item # Key: The dictionary key can be integer, float (real), string, or tuple. The key of a dictionary can be any immutable type. #在字典中检查键的成员资格比在列表中检查值的成员资格更有效, the larger the size of the data structure, the more obvious the efficiency gap between them >>> x=[]>>> x[42]= ' Foobar ' Traceback (most recent): File "<pyshell#24>", line 1, <module> x[42]= ' Foobar ' Indexerro R:list Assignment index out of range>>> x={}>>> x[42]= ' Foobar ' >>> x{42: ' Foobar '} #代码清单4-1 dictionary Sample #4.2.3 Dictionary formatted string >>> phonebook{' Beth ': ' 9102 ', ' Alice ': ' 2341 ', ' Cecil ': ' 3258 '}>>> ' Cecil ' phone Number is% (Cecil) s. "% phonebook" Cecil's phone number is 3258. ">>> template =" ' 
Sample Dictionary Demo
#coding =utf-8#e4-1.py Dictionary Demo sample # Simple Database # Use the name as a dictionary of keys, each with a dictionary, with the key ' phone ' and ' addr ' representing their phone number and address respectively. People = {' Alice ': {' Phone ': ' 2341 ', ' addr ': ' Foo Drive ', ' Beth ': {' phone ': ' 9102 ', ' addr ': ' Bar  Street '}, ' Cecil ': {' phone ': ' 3158 ', ' Addr ': ' Baz Avenue '}} #针对电话号码和地址使用的描写叙述性标签, will be used when printing output labels = {' Phone ': ' Phone number ', ' addr ': ' Address '}name=raw_ Input (' Name: ') #查找电话号码还是地址?
Use the correct key: request = Raw_input (' Phone number (p) or address (a)?
') #使用正确的键: if request = = ' P ': key = ' phone ' if request = = ' A ': key = ' addr ' #假设名字是字典中的有效键才信息打印: If name in People:print '%s ' s %s is%s. "% (name, Labels[key], People[name][key]) #python e4-1.py#name:beth#phone number (p) or address (a)? P#beth ' s phone number is 9102.

Sample Dictionary Method demo
    
#coding =utf-8#e4-2# A simple database with Get () # Add code to insert the database in code listing 4-1 people = {' Alice ': {' phone ': ' 2341 ', ' addr ': ' Foo drive 23 '}, ' Beth ': {' phone ': ' 9102 ', ' addr ': ' Bar  Street '}, ' Cecil ': {' phone ': ' 3158 ', ' addr ': ' Baz avenue '}}labels = {' Phone ' : ' Phone number ', ' addr ': ' address '}name = raw_input (' name: ') #查找电话号码还是地址? request = Raw_input (' Phone number (p) or address ( a)? ') #使用正确的键key = Request #假设请求既不是 ' P ' is also not ' a ' if request = = ' P ': key = ' phone ' if request = = ' A ': key = ' addr ' #使用get () provides default value: Per son = People.get (name, {}) label = Labels.get (key, key) result = Person.get (key, ' not available '), print '%s '%s ' is%s. "% ( Name, label, result) #python e4-2.py#name:beth#phone number (p) or address (a)? A#beth's address is Bar  Street. #python e4-2.py#name:cecil#phone Number (p) or address (a)? P#cecil ' s Phone number I S 3158. #python e4-2.py#name:cecil#phone Number (p) or address (a)?
X#cecil ' s x is not available.


 
Copyright notice: This article blog original articles, blogs, without consent, may not be reproduced.
 
Python's first basic Tutorial 4 Chapter Dictionary: When the index does not work also