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This article mainly shows you "how python realizes query", the content is simple and easy to understand, and the organization is clear. I hope it can help you solve your doubts. Let Xiaobian lead you to study and learn this article "how python realizes query".

query

Sort and query are good friends, long data structure inside (dictionary, list) inside we will have query, filter requirements. Sometimes, we need to find a certain element or a certain type of element from a long list. How to do it is very simple. Use the advanced function filter :

1). lambda filter

Comments:lambda is a very concise expression of the function, short and concise, coupled with the use of filter, very beautiful. For example, we use the startswith built-in function in the string to filter out the data we need in the list very conveniently! (Python3 slightly changed and added a list in addition to filter, otherwise the generated iterator address)

Comments: regular is a very good filtering method, sometimes a good regular top dozens of lines of code, proficient in regular play data analysis, data cleaning is a necessary skill!

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