python dictionary of dictionaries

{' sarlay ': 12000, ' name ': ' Zhangsan '}Find Value by keyCode: People = {' name ': ' Zhangsan '}print (people[' name ') ') Result: ZhangsanReturns all keys in the dictionaryCode dic = {' Tom ': One, ' Sam ': $, ' Lily ': 100}print (Dic.keys ()) results [' Lily ', ' Sam ', ' Tom ']Returns all the value in the dictionaryCode dic = {' Tom ': One, ' Sam ': $, ' Lily ': 100}print (Dic.values ()) Results [100, 57, 11]Set Set First, the concept:Fast access, can not be repeated, unorderedT

() Set the dictionary key-value pairs, group members, and finally return as a listDictionary operations: Keys (), VALUES ()Dictionary operation: Update (DICT1) updates the key-value pairs in the dictionary dict1 to the dictionaryDictionary operation:Items () An iterator that returns all elements of the dictionaryKeys () returns an iterator consisting of all keys

The following is a simple implementation of converting a json string into a dictionary in Python. I think this is quite good. now I will share it with you and give you a reference. Let's take a look at a friend's demand today: Lailai {'Isok': 1, 'isrunning': None, 'iserror': None} How to convert to dictionary Well, the json conversion is very simple. star

determine whether it can be used as a key value;Create a dictionary: {key:value}, or you can use the Dict () factory function to createA={' A ': 1, ' B ': 2}print aa=dict (a= ' C ', b=2) print Aprint a.get (' C ', ' not exist ')Dict () function is created so that the key is the default string, value is also the default, the number can be directly written;In the dictionary does not confirm whether there is

() is the return list in P2, which copies a copy of the memory, P3 in the generator, does not replicate within the P2 can be used D.iteritems ()6. Dictionary RestrictionsThe key of the dictionary cannot be duplicated, and can be hash, unordered7. Default DictionaryFrom collections Import DefaultdictD1 = defaultdict (list) #default初始化时, need to pass in a function, this function is also called the factory fu

, sorting and other operations>>> student = {'GHOSTWU': {'name':'GHOSTWU',' Age': 20,'score': {'Math': 78,'中文版': 66,'python': 75 } } }>>>student{'GHOSTWU': {' Age': 20,'score': {'python': 75,'Math': 78,'中文版': 66},'name':'GHOSTWU'}}>>> student['Tom'] = {'name':'Tom',' Age': 21,'score': {'Math': 60,'中文版': 80,'python': 90 } }>>>student{'GHOSTWU': {' Age': 20,'score'

Python dictionaries can store any type of object, such as strings, numbers, tuples ... Advantages: Easy to take value, fast speed1, create a dictionaryA dictionary consists of a key (key) and a corresponding value (value). Dictionaries are also referred to as associative arrays or hash tables. The basic syntax is as fo

): Determine if there is a key in the dictionary, it is recommended to use in and not in instead of+dic.keys () returns a list of keys in the dictionary+dic.items () Returns a list of the corresponding tuples of the key value+dic.iter* () Iteritems () Iterkeys () returns the iteration value instead of the list+dic.setdefault (Key,default=none) with set, if key exists return its value, if key does not exist

(dic name): Gets the number of key-value pairs for the dictionary. Dic.keys (): Returns all keys in the dictionary. Dic.values (): Returns all values in the dictionary. Dic.items (): Converts the dictionary to Ganso. Iv. Ganso (11,22,33) function is the same as the list, and differs in that Y

Python implements the merge of two dictionaries (dict), pythondict This article describes how to merge two dictionaries (dict) in Python. The specific method is as follows: Two existing dictionaries, dict, are as follows: dict1={1:[1,11,111],2:[2,22,222]}dict2={3:[3,33,333],

,b_list))>>> AA{' Baidu ': ' com ', ' www ': ' 163 ', ' 123 ': ' B ', ' com ': ' vedio ', ' cn ': ' OA '}The a_list list is a keyword straight in the new dictionary, while the B_list list is straight in the new dictionary.2. Get3. References and copies4. Insert (update), deleteCC = {' QQ ': ' qq.com '}>>> cc{' QQ ': ' qq.com '}>>> aa.update (CC)>>> AA{' Baidu ': ' com ', ' QQ ': ' qq.com ', ' www ': ' 163 '

1. Basic RequirementsWrite a program to query the Employee Information table to achieve the following functions:(1) Let the user enter no less than 3 characters to query employee information(2) Through employee number or employee personal information can be accurate or fuzzy query to employee information(3) Output employee information 2. Implementing Code and annotationsfirst, provide the TXT file for employee information:[Email protected]:/mnt/hgfs/py