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When a docker build -t mytag . fails with a message such as ---> Running in d9a42e53eb5a The command '/bin/sh -c returned a non-zero code: 127 (127 means "command not found, but 1) it is not trivial for everybody 2) 127 may be replaced by 6 or anything) it may be non trivia...

Sphinx allows the inclusion of docstrings in the documentation using the autodoc extension which is shipped with the package. This documentation will show you how to format your docstrings an how to include them in your documentation.

When using async callback we need to consider scope. Especially if inside a loop. This simple article shows what not to do and a simple working example.

You can use Pentaho Data Integration (Kettle) to Transfer Data from One Database to another. Its very easy as the transformation is automatically created just by creating the connection.and it can transfer Lacs of records very quickly.

Applicative is the class of types f :: * -> * which allows lifted function application over a structure where the function is also embedded in that structure. Definition class Functor f => Applicative f where pure :: a -> f a (<*>) :: f (a -> b) -> f a -> f ...

Manipulating directories from the command line

Buttons can be one of the most frustrating parts of email development, but they can be built with code instead of images and still display well in all major email clients. When built in HTML/CSS, a button will display in all email clients even with images off. Both the content and style of each butt...

Input and Output in scheme is usually handled trough ports. A port is a data structure which is used to interact with the world outside Scheme. A Port isn't limited to files but can be used to read/write to sockets. In some ways, the port object is some kind of universal object that can not onl...

As the name implies, vector drawables are based on vector graphics. Vector graphics are a way of describing graphical elements using geometric shapes. This lets you create a drawable based on an XML vector graphic. Now there is no need to design different size image for mdpi, hdpi, xhdpi and etc. W...

This section provides an overview of what automation is, and why a developer might want to use it. It should also mention any large subjects within automation, and link out to the related topics. Since the Documentation for automation is new, you may need to create initial versions of those rel...

Java objects which are created by web container.There are 9 implicit objects | object | Type | | ---------- | ------------------ | | out | JspWriter | | request | HttpServletRequest | | response | HttpServletResponse| | config | ServletConfig | | app...

When you receive an error: "Microsoft Access has encountered a problem and needs to close", there is often not a lot of information to help you identify the cause of the error. Below are a series of steps you can take to troubleshoot the cause of the errors. Be sure to remove other vari...

What is the difference between a listener and a visitor? The difference between listener and visitor mechanisms is listener methods are called by the ANTLR-provided walker object, whereas visitor methods must walk their children with explicit visit calls. Forgetting to invoke visit() on a node’s chi...

This Simple Google App Web Script (Standalone) allows Google Drive to be repeated polled for files to be downloaded to the user's local PC. Shows how to use one app script to provide the function of both the: 1. User interface (a simple one in this example) 2. The file download page. For a fu...