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querying Category. Of course, django's orm provides a lot of frequently-used functions. I will not give them one by one here. Note that here I am talking about a lot of frequently-used functions, for the complex hibing policies in hibenate. I didn't see it in django. However, I'm glad that I didn't find this function in django, because django is positioned as a fast Internet development. it doesn't need to pay too much attention to things that rarely

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IntroductionThe blog just opened, want to take the recent study of things to record down, is a kind of notes. Recently I'm going to start learning python, because I feel python is a very interesting language, long ago to learn (lazy), it is very powerful, you can use it for scientific operations, or digital image processing, or task automation, you can also build dynamic website, A lot of it sounds like an

Original works, reproduced please indicate the source: point IPrevious article Python Advanced Programming Generator (Generator) and Coroutine (i): Generator, we describe what is Generator, and write a few examples of using Generator function, this section, We'll introduce Python's coroutine, and there will be a small example, and the next article will introduce the advanced usage of coroutine in the form o

well suited for applications in various practical issues. I acknowledge that I do not have any basic knowledge of the analog aspects of the field of programming prior to recent communication and research. I suspect that most of the readers of this column, like me, know little about this knowledge. While some might argue that this style of programming is somewhat novel, simulations can be useful in understa

In the previous chapter, reading self-study python-socket programming inside found a lot of problems, a focus is not know what Python class is, always in Baidu every code is what meaning, found as if the problem is very big, in case there is also a class how to do, is every word Baidu??? , resolute Baidu "Python object

The Python decorator's name is decorator, and when you see the English name, you might confuse it with the decorator in design, which is a totally different two thing. Although it seems that they want to do is very similar--all want to do some "cosmetic work" for an existing module, the so-called cosmetic work is to add some small decoration (some small functions, these small functions may be used in many modules), But not to allow this small decorati

The generator is an iterator, and it is not just an iterator. However, there are not many uses outside the iterator, so we can say it out loud: the generator provides a convenient way to customize the iterator. This is the last article in the functional programming guide. It seems that it took a week to write it well ...... For reprint, please specify the original author and original address :) 4. Generator 4.1. Introduction to Generator First, be s

I have been using Python for many years, and even today I am still amazed at the cleanliness of the code and its applicability to the DRY programming principles. Over the years, I have learned a lot of tips and knowledge. most of them are through reading popular open-source software, such as Django, Flask, the skills I picked below in Requests are often ignored, but they can really help us in daily

binding The attentive reader may recall the limitations I pointed out in the 1th part of the function technique. It is not possible to avoid the rebinding of names that represent function expressions, especially in Python. In FP, names are often interpreted as abbreviations for longer expressions, but this implies that "the same expression always evaluates the same value". This hint is not true if the name of the tag is re-bound. For example, let's d

Python's decorator is similar to java/c# 's annotation in its use, which is to decorate something for this method by adding a @xxx annotation to the method name. However, Java/c# 's annotation is also very daunting, too TMD complex, you want to play it, you need to know a bunch of annotation library documents, let people feel is learning another language. Python uses a very elegant method relative to decorator pattern and annotation, which does not re

One, function-type programming Create a function A function is composed of the keyword Def, with the function name and the parentheses colon, and the arguments in parentheses, when you want to execute the function, just write the function name and parentheses Format: def functions (parameter) create a function below #!/usr/bin/env python#-*-coding:utf-8-*-#创建函数def print_str (): print ("Hello World") #调用

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I've been programming with Python for years, even today I'm still amazed at how this language can make the code behave neatly and apply to dry programming principles. These years of experience have made me learn a lot of small skills and knowledge, mostly by reading very popular open source software, such as Django, Flask, requests. Some of the techniques I've p