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CPython
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<p>CPython is the <a href="/facts/Reference_implementation/k9B97xel">reference implementation</a> of the <a href="/facts/Python_/YbuGqofa">Python programming language</a>. Written in <a href="/facts/C_/Ky2No763">C</a> and Python, CPython is the default and most widely used implementation of the Python language. </p><p>CPython can be defined as both an <a href="/facts/Interpreter_(computing)/JB85fbyb">interpreter</a> and a <a href="/facts/Compiler/WNfCDFJe">compiler</a> as it compiles Python code into <a href="/facts/Bytecode/EPkMFR7M">bytecode</a> before interpreting it. It has a <a href="/facts/Foreign_function_interface/ntAxkhK0">foreign function interface</a> with several languages, including C, in which one must explicitly write <a href="/facts/Language_binding/V5HW4Wr4">bindings</a> in a language other than Python. </p>