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Cython is an open-source programming language. It's designed to be a superset of the Python programming language that supports calling C functions and declaring C types on variables and class attributes. Cython can automatically convert Python-like code into optimized C or C++ code, which can then be compiled as a Python extension module. This combination allows for high-level operations with the simplicity of Python syntax while maintaining performance similar to programs written in C or C++. This makes it useful for scientific computing, computational tasks requiring numerical precision, and interfacing with existing codebases written in low-level languages like Fortran or assembly. Cython's static typing features enable developers to explicitly define types at compile time, reducing overhead during runtime execution compared to standard Python where types are checked at runtime.

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