Python interface definitions stub files for professional development

python interface definitions stub files are used in professional development to provide type hints and documentation for external libraries or modules, especially in cases where the source code is not available or when working with dynamically typed languages like python.

stub files have the extension `.pyi` and contain only function signatures, class definitions, and type hints without any actual implementation code. these stub files can be used by code editors and ides to provide autocomplete suggestions, type checking, and improve code readability.

here is an example of a simple python interface definition stub file for a hypothetical library `my_library`:

in this stub file, we have defined two functions `add_numbers` and `greet` with their respective type hints. the `...` indicates that there is no implementation code in the stub file.

to use this stub file in your python code, you can simply import it like a regular module:

using interface definition stub files can greatly improve the development experience when working with external libraries or modules in python, especially in large codebases where type hints and documentation are crucial for maintaining code quality and readability.

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