Python Cookbook 3rd notes (1.16): filtering sequence elements
Filter sequence elements
problem
You have a data sequence and want to use some rules to extract the required values or shorten the sequence
solution
The simplest way to filter sequence elements is to use list derivation. For example:
>>> mylist = [1, 4, -5, 10, -7, 2, 3, -1]
>>> [n for n in mylist if n > 0]
[1, 4, 10, 2, 3] ...
Posted by solaris77 on Mon, 09 May 2022 03:17:15 +0300
python SDK example of alicloud object storage OSS
background
In recent projects, the company needs to use Alibaba cloud oss storage to store image files online in real time. Therefore, we investigated and developed the python version of Alibaba cloud oss SDK. Here we introduce the common methods of oss and python oss.
oss introduction
Alibaba cloud object storage OSS (Object Storage Service) i ...
Posted by ziong on Mon, 09 May 2022 02:26:51 +0300
Crawler practice platform for scratch learning 4
preface
The last article talked about how to use the combination of sweep and selenium to crawl data. This article is about how to use selenium to crawl websites that use Ajax to load data and pass the anti crawl.
Environment configuration
All the environments used in this article have been configured in the previous article. If you don't know ...
Posted by hbradshaw on Sun, 08 May 2022 23:47:21 +0300
Python crawler send request
send request
1. urlopen
urllib.request simulates the most basic form of constructing HTTP requests API of urlopen() function:
urllib.request.urlopen(url, data=None, [timeout, ]*, cafile=None, capath=None, cadefault=False, context=None)
In addition to the first parameter, you can pass the url, and you can pass the following parameters.
1.1 ...
Posted by .Darkman on Sun, 08 May 2022 14:19:50 +0300
Two key points of Python deconstruction and encapsulation
The text and pictures of this article come from the Internet and are only for learning and communication. They do not have any commercial use. The copyright belongs to the original author. If you have any questions, please contact us in time for handling
The following article comes from Tencent cloud, written by brother Liang in the workplace ...
Posted by cshinteractive on Sun, 08 May 2022 12:08:08 +0300
python analyzes the current situation of rental housing in Beijing, and the final price distribution map is bright
The rental information is already available. In order to have an intuitive understanding of the current rental market in Beijing, I conducted an in-depth analysis of the data and visualized it.
From the analysis results, I obtained important information such as where there are many housing listings, the average rental price in each district, an ...
Posted by shruti on Sun, 08 May 2022 11:32:01 +0300
[from the official case study framework Keras] seq2seq based on character LSTM
[from the official case study framework Keras] seq2seq based on character LSTM
Keras official case link Tensorflow official case link Paddle official case link Pytoch official case link
Note: this series only helps you to quickly understand and learn, and can independently use the relevant framework for in-depth learning research. Please ...
Posted by sarah on Sun, 08 May 2022 07:29:41 +0300
Technology sharing | common causes of MySQL startup failure
Author: Yao yuan
Focus on Oracle and MySQL databases for many years, Oracle 10G and 12C OCM, MySQL 5.6, 5.7, 8.0 OCP. Now Dingjia technology serves as a technical consultant to provide database training and technical support services for colleagues and customers.
Source of this article: original contribution * produced by aikesheng o ...
Posted by squalls_dreams on Sun, 08 May 2022 03:53:20 +0300
python xmind to Excel (puppet Lolo original)
Requirements: Convert the xmind file to an Excel file, and add UI interface operations to reduce the difficulty of operation.
This requirement can be made clear in one sentence, but in fact there is still a lot of work to be done:
1. Understand the Xmind file structure
2. Extract the branch content of the Xmind file (emphasis)
3. UI interface ( ...
Posted by Goon on Sun, 08 May 2022 00:42:39 +0300
[backtracking algorithm] facebook interview question - bracket generation
catalogue
Title Description
Backtracking solution
Title Description
Title address: https://leetcode-cn.com/problems/generate-parentheses/
Given that n represents the logarithm of the generated parentheses, please write a function so that it can generate all possible and effective parenthesis combinations. For example, given n = 3, the gen ...
Posted by sundawg on Sat, 07 May 2022 22:48:58 +0300