Tag：python
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Time：2019-10-23
In the previous article, we added two modelsQuestionsandCommentsAnd for theUsersincreasedavatar_pathThis field is then updated to the database with this code: with app.test_request_context(): db.drop_all() db.create_all() Because when useddb.create_all()After that, use it directly againdb.create_all(), the changes to the model will not be updated to the databasedb.drop_all()Delete all the tables in the database first, thendb.create_all()At a time. Sounds […]
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Time：2019-10-23
Description: Build React Native Android development environment and basic React Native project under Windows Environment variable add control panel -> system and security -> system -> advanced system Settings -> advanced -> environment variable -> new The project is built and debugged by real machine. If necessary, Android emulator is used Reference documentation https://reactnative.cn/docs/g… I. […]
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Time：2019-10-23
Abstract:How can you learn machine learning without these resources? (TFboy discipline) If you’re curious about artificial intelligence, data science, and machine learning, I’m sure you’ve heard of Google’s machine learning API, TensorFlow, which they’ve used to develop their Rank Brain algorithm for Google search. TensorFlow is one of the most popular machine learning apis that […]
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Time：2019-10-23
More than a year ago the http://segmentfault.com/a/1190000000426460 to read this article, plus some jscoGive me the knowledge, have a deeper understanding. Front Knowledge yield and generator will be the front knowledge of this article. And you should also have some sense of epoll/kqueue and callback style. Let’s enjoy the source code of the implement of […]
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Time：2019-10-23
Why is the xor problem linearly indivisible? When you read the textbook, it’s often said that perceptrons (single layer neural networks) can’t solve the xor problemWhy??? because Perceptrons deal with linear problems An xor problem is a nonlinear problem What is linearly separable? Whether an n-dimensional binary dataset is linearly separable depends on whether there […]
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Time：2019-10-23
1. Introduction We’ve already talked about AlexNet, so let’s look at GoogLeNet. GoogLeNet won the first prize in the 2014 ImageNet challenge (ILSVRC14). So how does GoogLeNet improve network performance?Generally speaking, the most direct way to improve the network performance is to increase the depth and width of the network. Depth refers to the number […]
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Time：2019-10-23
This article is original and first published on the public account [Python is a cat, without authorization, do not reprint.The original address: https://mp.weixin.qq.com/s/5hpFDgjCpfb0O1Jg-ycACw Readers familiar with “Python cat” should know that all of my posts use highly distinctive illustrations — cat for the original article and dog for the reproduced article, with rare exceptions. These […]
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Time：2019-10-23
Python3 web crawler actual practice –2, request library installation: GeckoDriver, PhantomJS, Aiohttp Crawlers can be simply divided into several steps: grab the page, analyze the page, store data. In the process of fetching the page in the first step, we need to simulate the browser to make a request to the server, so we need […]
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Time：2019-10-21
Preface Liver a day, finally hit the third, record.It’s really a good dish~~~~ Reverse baby_reverse The encryption function is as follows int __fastcall encode(const char *a1, __int64 a2) { char v3[32]; // [rsp+10h] [rbp-70h] char v4[32]; // [rsp+30h] [rbp-50h] char v5[36]; // [rsp+50h] [rbp-30h] int v6; // [rsp+74h] [rbp-Ch] int v7; // [rsp+78h] [rbp-8h] int […]
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Time：2019-10-21
4.1 write the code for the sum function. def diy_sum(arr): if not arr: return 0 elif len(arr) == 1: return arr[0] else: return arr.pop(0) + diy_sum(arr) arr = [1, 2, 3] print(diy_sum(arr)) 4.2 write a recursive function to calculate the number of elements in the list. def count_elements(list): if not list: return None elif len(list) […]
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Time：2019-10-21
code # encoding: utf-8 # author: walker # date: 2017-07-31 #Summary: Linux view all users of a user group # filename: group_users.py import sys #Print all members of a group def ShowGroupUsers(group_name): group_id = ‘err’ users = ” with open(‘/etc/group’) as f: for line in f: line = line.strip() vec = line.split(‘:’) if vec[0] == […]
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Time：2019-10-21
In the last chapter, I learned about automated testing, which is very good. Now we can work hard to write a comprehensive test to ensure that the code is always healthy. That said, as an independent developerIt’s hard to write really comprehensive test code。 This is because users will not follow the rules when using […]
