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The Dependency Injection (DI) is an essential pattern when building large systems. It forces classes to be more modular and reusable by making them depend on an interface instead of a concrete class. Simply put classes favor instances passed into the init instead of creating new instances.

Stackless Python, or Stackless, is a Python programming language interpreter, so named because it avoids depending on the C call stack for its own stack. The most prominent feature of Stackless is microthreads, which avoid much of the overhead associated with usual operating system threads. In addition to Python features, Stackless also adds support for coroutines, communication channels and task serialization.

ABOUT Slut is a programming framework for generative, synthetic, interactive, network-enabled graphics. Slut generates images from processes. Such processes may be simple "construction plans" or they may depend on user input. They may be drawn from incoming network data or messages that are sent to the network. Produced images may be adaptive, accumulative or static. They may look and feel like computer games or they may inform like scientific visualizations. They may be lyrical, cynical, political, intrusive (literally over the network), simply beautiful or banal.

common ways to use doctest: To check that a module’s docstrings are up-to-date by verifying that all interactive examples still work as documented. To perform regression testing by verifying that interactive examples from a test file or a test object work as expected. To write tutorial documentation for a package, liberally illustrated with input-output examples. Depending on whether the examples or the expository text are emphasized, this has the flavor of “literate testing” or “executable documentation”.

Running the module as a script causes the examples in the docstrings to get executed and verified

The file content is treated as if it were a single giant docstring; the file doesn’t need to contain a Python program! For example, perhaps example.txt contains this