Tag：Dictionaries
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Redis core principle and practice — implementation principle of hash type and dictionary structure
Redis hash type can store a set of unordered key value pairs, which is especially suitable for storing an object data. > HSET fruit name apple price 7.6 origin china 3 > HGET fruit price “7.6” This paper analyzes the hash type in redis and the implementation principle of its underlying data structure dictionary. Dictionaries […]
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Detailed explanation of the use of Python dictionary and example code
catalogue What does the dictionary look like What can I put in the dictionary Access dictionary content Modify dictionary content Delete dictionary data Dictionary built-in function Dictionary is a form of hash table data structure implemented by python, which represents the mapping relationship, one-to-one. What does the dictionary look like {}It can be seen that […]
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A dictionary tree
What is a dictionary tree Dictionary tree is aSpace for timeThe data structure, also known as trie tree and prefix tree, is a tree structure (dictionary tree is a data structure), which is typically used for statistics, sorting and saving a large number of strings. Therefore, it is often used in text word frequency statistics […]
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Discover a secret: both Python 3 After 6, the dictionary turned into an ordered set. I verified it again!
I’ve been using version 3.8 for the higher version. I’ll use Python 3.0 first 8 version to test whether it will produce orderly words [read the full text] test_dict = {‘o’: 1,’p’: 2,’q’: 3,’r’: 4,’s’: 5,’t’: 6} Use the KSYS () function to verify that the keys of the dictionary are in order print(test_dict.keys()) # […]
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Source code analysis of WebView JavaScript Bridge
In the recent project, 80% of the pages in the app and applet have been replaced with H5 for rapid development and easy hot update. In addition to ensuring high code reuse and reducing coupling, the front end should also actively communicate with the students responsible for native development, define the protocol and leave documents […]
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[IOS] watch animation from implicit animation
In fact, I have written the reading notes of advanced animation before, which are mainly about view. In fact, this time it is the same. I just summarize the several knowledge points I said in pieces before, and discuss something else. 1. Implicit animation Each of usUIViewThere is a defaultrootLayer, thislayerIt’s actually the real thing […]
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Fault analysis | handling of a failure in upgrading MySQL 5.6 to 8.0
Author: Fu Xiang Now living in Zhuhai, he is mainly responsible for the maintenance of Oracle, mysql, mongodb and redis. Source: original contribution *It is produced by aikesheng open source community. The original content cannot be used without authorization. For reprint, please contact Xiaobian and indicate the source. 1. Background At present, the MySQL version […]
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1.7 dictionary sorting
Problem description You want to create a dictionary and control the order of elements when iterating or serializing the dictionary. Solution Here is a new container:collectionsIn the moduleOrderedDictClass. Its usage is as follows: from collections import OrderedDict d = OrderedDict() d[‘a’] = 1 d[‘b’] = 2 d[‘c’] = 3 discuss Ordered dictionaries are like regular […]