CPython is bytecode interpreter?

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CPython is the implementation of Python in C. It’s the first implementation, and still the main one that people mean when they talk about Python. It compiles .py files to .pyc files. .pyc files contain bytecodes. The CPython implementation also interprets those bytecodes.
CPython is not written in C++, it is C.

The compilation from .py to .pyc happens transparently as needed. When you execute a .py file, it will first be compiled to a .pyc file if needed, then the .pyc file will be interpreted.

Jython is different because (in addition to being implemented in Java instead of C) it compiles .py files into .class files so they can be executed in the JVM.

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