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Pip's command-line interface allows the install of Python software packages by issuing a command: pip install some-package-name. Users can also remove the package by issuing a command: pip uninstall some-package-name. pip has a feature to manage full lists of packages and corresponding version numbers, possible through a "requirements" file. [14]
Package metadata include package description, package version, and dependencies (other packages that need to be installed beforehand). Package managers are charged with the task of finding, installing, maintaining or uninstalling software packages upon the user's command. Typical functions of a package management system include:
The command is customizable with many options and modifiers. The emerge tool is the most important utility for accessing the features of Portage from the command line. The program calculates and manages dependencies, executes ebuilds and maintains the local Portage tree and database of installed packages.
BitBake is co-maintained by the Yocto Project and the OpenEmbedded project. BitBake recipes specify how a particular package is built. Recipes consist of the source URL ( http , https , ftp , cvs , svn , git , local file system) of the package, dependencies and compile or install options.
This avoids overriding the system python binary by default when installing Python as a dependency. It also paves the way to eventually have python be Python 3.x. 1.2.0 2017-05-01 most Homebrew taps (package repositories) in the Homebrew GitHub organisation have been deprecated and the currently buildable software moved into Homebrew/homebrew-core.
Interface injection, where the dependency's interface provides an injector method that will inject the dependency into any client passed to it. In some frameworks, clients do not need to actively accept dependency injection at all. In Java, for example, reflection can make private attributes public when testing and inject services directly. [30]
The following projects were formerly part of Jakarta, but now form independent projects within the Apache Software Foundation: Ant - a build tool; Commons - a collection of useful classes intended to complement Java's standard library. HiveMind - a services and configuration microkernel; Maven - a project build and management tool
In object-oriented design, the dependency inversion principle is a specific methodology for loosely coupled software modules.When following this principle, the conventional dependency relationships established from high-level, policy-setting modules to low-level, dependency modules are reversed, thus rendering high-level modules independent of the low-level module implementation details.