Programmer Think

The main functions are as follows: 1. Call api interface to get json data; 2. Convert json data to a csv file; 3. Convert each line of data in the csv file to a single xml file; 4. Package every 5 XML files The modules used are:        csv,xml,threading,tarfile,queue Daemons         memorandum: Multi thread communication can use a safe q ...

I have a dictionary: the key is a string and the value is an integer. Example: stats = {'a':1000, 'b':3000, 'c': 100} I would like to use'b'as the answer because it is a key of greater value. I use an intermediate list with a tuple of reverse key values to do the following: inverse = [(value, key) for key, value in stats.items()] ...

Can another regular expression be used to detect valid regular expressions?If so, give an example below. #1st floor Not likely. Evaluate try..catch or the language you provide. #2nd floor / ^ # start of string ( # first group start (?: ( ...

Java 8 API provides many new functional interfaces to make the work more convenient. Some interfaces are from Google Guava library. Even if you are familiar with these interfaces, it is necessary to see how they are extended to lambda. I. Optional interface 1. Various problems caused by null 1) it is the source of error: NullPointException is t ...

This article will lead to several questions, and through examples to analyze the delegation and usage in C#as a starting point For delegation I find that most people have the following questions, or may have encountered such questions in an interview: Is a delegate equivalent to a C/C++ function pointer? What exactly is a delegation? What exac ...

background Multithreading updates the value of variables, which may not get the expected value. Of course, adding the synchronized keyword can solve the problem of thread concurrency. Another solution is provided here, that is, the atomic operation class under the java.util.concurrent.atomic package, which provides a simple, efficient and thre ...

python test development project practice directory python tools book download - continuous update python 3.7 quick start tutorial - Directory Requirement Use tkinter to generate the following window: Enter a name in the text box in the upper right corner, select a number in the next drop-down box, click "click me!", and the text o ...

[TOC] target List of existing dictionaries # A = [ {dict1}, {dict2} ] B = [ {dict3}, {dict2} ] C = [ {dict3}, {dict4} ] M = [A,B,C] X = [] Put M's de duplicated dictionary into list X, and get X = [{dict1}, {dict2},{dict3}, {dict4}] difficulty Dictionary list At the beginning, you may think of using set() function to ...

Recently, our shopping mall has been more and more widely used. But in the process of application upload, there is a problem: each application on the shelf needs to be configured with an application cover image, and the size of the cover image has a specified range of 300 * 175. And the size of the picture we make is usually larger than that. S ...

The examples prepared for MOOC are simple in thinking. In order to include knowledge points, some verbose functions are used, which may not be the most concise. But they are very easy to use. The main programs of many tractors and landlords are estimated to be so complete. Later, they can be modified into interface version when ...