x, y, z = 0, 1, 0 if x == 1 or y == 1 or z == 1: print('passed') if 1 in (x, y, z): print('passed') # These only test for truthiness: if x or y or z: print('passed') if any((x, y, z)): print('passed')…

x, y, z = 0, 1, 0 if x == 1 or y == 1 or z == 1: print('passed') if 1 in (x, y, z): print('passed') if x or y or z: print('passed') if any((x, y, z)): print('passed') 上面的公式效果是等效的.…

原文:https://coryrylan.com/blog/angular-multiple-http-requests-with-rxjs --------------------------------------------------------------- Cory Rylan Nov 15, 2016 Updated Feb 25, 2018 - 5 min readangular rxjs This article has been updated to the latest v…

http://docs.oracle.com/javase/tutorial/essential/regex/index.html This lesson explains how to use the java.util.regex API for pattern matching with regular expressions. Although the syntax accepted by this package is similar to the Perl programming l…

Beej's Guide to Network Programming Using Internet Sockets Brian "Beej Jorgensen" Hallbeej@beej.us Version 3.0.15July 3, 2012 Copyright © 2012 Brian "Beej Jorgensen" Hall Contents 1. Intro 1.1. Audience 1.2. Platform and Compiler 1.3. …

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CoffeeScript is a little language that compiles into JavaScript. Underneath that awkward Java-esque patina, JavaScript has always had a gorgeous heart. CoffeeScript is an attempt to expose the good parts of JavaScript in a simple way. The golden rule…

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本文为阅读MDN文档笔记 目录 Different types of Selectors Attribute Selectors Presence and value attribute selectors Substring and value attribute selectors Pseudo-selectors Pseudo-classes Pseudo-elements Combinators Different types of Selectors Simple selectors:…

Serial Wire Debug interface The Serial Wire Debug protocol operates with a synchronous serial interface. This uses a single bidirectional data signal, and a clock signal. This section gives an overview of the physical Serial Wire Debug interface. Lin…

influxdb influxdb是最新的一个时间序列数据库,最新一两年才产生,但已经拥有极高的人气.influxdb 是用Go写的,0.9版本的influxdb对于之前会有很大的改变,后端存储有LevelDB换成了BoltDB,读写的API也是有了很大的变化,也将支持集群化,continuous query,支持retention policy,读写性能也是哇哇的,可以说是时间序列存储的完美方案,但是由于还很年轻,可能还会存在诸多的问题,就像现在正在开发的0.9一样,发布一拖再拖,就是由于还有…

知识结构 pyplot.plot()流程 1. _axes.py中plot()函数说明 a. 调用说明 plot([x], y, [fmt], data=None, **kwargs)       plot([x], y, [fmt], [x2], y2, [fmt2], ..., **kwargs) You can use `.Line2D` properties as keyword arguments for more control on the appearance. Line pro…

CoffeeScript is a little language that compiles into JavaScript. Underneath that awkward Java-esque patina, JavaScript has always had a gorgeous heart. CoffeeScript is an attempt to expose the good parts of JavaScript in a simple way. The golden rule…

LOCKFILE(1) LOCKFILE(1) NAME lockfile - conditional semaphore-file creator SYNOPSIS lockfile -sleeptime | -r retries | -l locktimeout | -s suspend | -! | -ml | -mu | filename ... DESCRIPTION lockfile can be used to create one or more semaphore files.…

转自:http://kernel.meizu.com/linux-workqueue.html 21 August 2016   Workqueue 是内核里面很重要的一个机制,特别是内核驱动,一般的小型任务 (work) 都不会自己起一个线程来处理,而是扔到 Workqueue 中处理.Workqueue 的主要工作就是用进程上下文来处理内核中大量的小任务. 所以 Workqueue 的主要设计思想:一个是并行,多个 work 不要相互阻塞:另外一个是节省资源,多个 work 尽量共享资源 (…

Manual -- curl usage explained Related: Man Page FAQ LATEST VERSION   You always find news about what's going on as well as the latest versions from the curl web pages, located at:   https://curl.haxx.se   SIMPLE USAGE   Get the main page from Netsca…

influxdb和boltDB简介——MVCC+B+树,Go写成,Bolt类似于LMDB,这个被认为是在现代kye/value存储中最好的,influxdb后端存储有LevelDB换成了BoltDB https://www.cnblogs.com/bonelee/p/6236234.html influxdb influxdb是最新的一个时间序列数据库,最新一两年才产生,但已经拥有极高的人气.influxdb 是用Go写的,0.9版本的influxdb对于之前会有很大的改变,后端存储有Level…

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[译]Android API 规范 译者按: 修改R代码遇到Lint tool的报错,搜到了这篇文档,aosp仓库地址:Android API Guidelines. 58e9b5f Project import generated by Copybara. by Android API Council · 9 months ago c0b835d Initial empty repository by Baligh Uddin · 8 years ago 提交记录显示最近才更新的,是官方的应用…

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今天写了一条iptables的规则 iptables -t filter -A INPUT -s 192.168.192.0/24 -d 192.168.192.140 -p tcp -dport 22 -j ACCEPT  然后一直出现上面的错误 原来是-dport 写错了 应该写成--dport…

Convert from list Apply np.array() method to convert a list to a numpy array: import numpy as np mylist = [1, 2, 3] x = np.array(mylist) x Output: array([1, 2, 3]) Or just pass in a list directly: y = np.array([4, 5, 6]) y Output: array([4, 5, 6]) Pa…

Virtual addresses from multiple address spaces are translated to real addresses in main memory by generating for each virtual address an address space identifier (AID) identifying its address space. Then, the virtual address and its AID are used to o…

The present invention allocates resources in a multi-operating system computing system, thereby avoiding bottlenecks and other degradations that result from competition for limited resources. In one embodiment, a computer system includes resources an…

https://datatracker.ietf.org/doc/rfc8684/?include_text=1 TCP Extensions for Multipath Operation with Multiple AddressesRFC 8684   Document Type   RFC - Proposed Standard (March 2020; No errata) Obsoletes RFC 6824 Was draft-ietf-mptcp-rfc6824bis (mptc…

1225. Flags Time limit: 1.0 secondMemory limit: 64 MB On the Day of the Flag of Russia a shop-owner decided to decorate the show-window of his shop with textile stripes of white, blue and red colors. He wants to satisfy the following conditions: Stri…