A dependency injection system for python
Fang is a dependency injection library for Python.
Fang adds dependency injection in Pythonic way, without requiring the elements more usually seen in “big OO” languages. Particularly:
- dependencies are specified by identifier strings, rather than strict interface classes or types.
- the constructs which meet dependencies (resource providers) are just functions, not factory classes.
- the dependencies which a piece of code needs and the dependencies it can provide are both declared concisely with decorators.
- the linking of dependents and resource providers is done at run-time in Python, not with a custom-built configuration language.
The pieces used are small and easy to understand: the total library is less than 300 lines. But it’s clear and simple enough to serve as a foundation for other features (eg dependency graphs, interface verification), which can enabled or added on a per-project basis.
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