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App Inventor 2 进制转换与位运算教程 - 十六进制、二进制、补码、字节操作...
...进制转换与位运算教程 - 十六进制、二进制、补码、字节操作
一、为什么需要进制转换
二、App Inventor 2 内置的进制相关积木块
2.1 基本数字块（Basic Number Block）
2.2 基数数字块（Radix ...
Python Requests and persistent sessions
...ests.Session()
After that, continue with your requests as you would:
s.post('https://localhost/login.py', login_data)
#logged in! cookies saved for future requests.
r2 = s.get('https://localhost/profile_data.json', ...)
#cookies sent automatically!
#do whatever, s will keep your cookies intact :)...
pg_config executable not found
...
pg_config is in postgresql-devel (libpq-dev in Debian/Ubuntu, libpq-devel on Centos/Cygwin/Babun.)
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扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...器，只需拖动一个块并在发生特定事件时添加所需的相应操作即可。
与传统的基于文本的编程不同，MIT App Inventor 引入了一种事件驱动的编程模型。“事件”是计算机科学中的一个概念，指的是用户的操作，例如触摸屏幕、单...
How to color System.out.println output? [duplicate]
...20-console.html
Edit: of course there are newer articles than that one I posted, the information is still viable though.
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Linux/Unix command to determine if process is running?
I need a platform independent (Linux/Unix|OSX) shell/bash command that will determine if a specific process is running. e.g. mysqld , httpd ...
What is the simplest way/command to do this?
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Difference between binary semaphore and mutex
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They are NOT the same thing. They are used for different purposes!
While both types of semaphores have a full/empty state and use the same API, their usage is very different.
Mutual Exclusion Semaphores
Mutual Exclusion semaphores are used to protect shared resources (data structure...
Is gettimeofday() guaranteed to be of microsecond resolution?
...that was originally written for the Win32 API, to Linux (well, porting the OS X port of the Win32 port to Linux).
10 Answer...
TCPClient TCP客户端扩展：连接TCP服务器进行文本消息通信 · App Inventor 2 中文网
...cted 或 Aborted，返回 true。
连接超时 ConnectionTimeout
连接操作的超时时间（毫秒）。默认值：1000ms。
IO超时 IoTimeout
I/O 操作的超时时间（毫秒）。默认值：1000ms。
连接中止延迟 ConnectionAbortedDelay
连接中止后触发 DelayedConnect...
How do I add a path to PYTHONPATH in virtualenv
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I want to add a friendly comment that on shared hosts and similar situations venv wrapper is not desired. In such cases one venv is in effect and all that is needed making the additional install is not desired. Locally things are different, but on server/image KISS is reall...