python get value from dictionary

0x 01 Dictionary IntroductionThe child and list are the two most common data types in Python, the dictionary is the data type of the key-value pair (key-value) format, it has the same index as the list, but not the subscript in the list, but the key is used as the index, the

the initial value corresponding to all keys in the dictionary 4 Radiansdict.get (Key, Default=none)Returns the value of the specified key if the value does not return the default value in the dictionary

Mappings : Relationship of key-value pairs, key (key) mapping values (value)The dictionary is the only type of mapping for Python>>> Phonebook = {'Wakey':'1111','Ethon':'2222','Joho':'3333'}>>>phonebook{'Joho':'3333','Wakey':'1111','Ethon':'2222'}Extension: the difference between a mapping type and a sequence type1, Ac

"value=%s"% (value)the difference between values and viewvalues hereThe latter returns a View object of the dictionary, similar to the view in the database, when the dict changes, the View object changes as well .Common MethodsPython codeD = {"Name": "Nico", "Age": 23}d["name"] = "AAAA"d["Address"] = "ABCDEFG ...."Print d #{' age ':, ' name ': ' AAAA ', ' addres

. If the key does not exist, a new key-value is created. # Delete Infos. pop ('name') # specify the key to delete the key and the corresponding value.Infos. popitem () # randomly delete a key and the corresponding valueDel infos ['phone'] # specify the key to delete the key. If the key exists, the key and value are deleted. If the key does not exist, an error is returned.Infos. clear () # clear the

traversed (key, value) tuples as a list. Keys ()#returns a dictionary of all keys in a list>>> D1 = {'Addr':{'IP': 127.0.0.1,'Port': 80},'msg': 18}>>>D1.keys () Dict_keys (['msg','Addr']). VALUES ()#returns all values in the dictionary as a list>>> D1 = {'Addr':{'IP': 127.0.0.1,'Port': 80},'msg': 18}>>>d1.values () dict_values ([19, {'IP':'127.0.0.1','Port': 80}

This article mainly introduced the Python dictionary Sort implementation method, the example analyzes the Python dictionary sorting correlation skill, needs the friend to refer to the next This paper analyzes the method of Python dictio