How Does the Python Interpreter Execute Your Code?

Python is a beloved programming language in many fields. Most AI developers and researchers write Python code on the Tensorflow and PyTorch frameworks. Python is also widely used in data analytics with a rich set of data visualization tools like matplotlib. And thanks to Python’s feature enabling easy binding to C/C++, programmers can easily write code in Python while using C++ frameworks like Qt or ROS frameworks.

But do you know how the Python interpreter executes your code under the hood? If you are curious about the implementation of the Python interpreter, here’s a series of articles explaining and discussing the implementation of CPython, an implementation of Python written in C.

In this series of articles, our explanation is based on CPython of version 3.19 and the Ubuntu environment. You can build CPython from source with the commands below.

PyPreConfig configurations are related to the user environment or the operating system. One of the most important things that PyPreConfig does is to set the Python memory allocator. Pyconfig defines runtime configurations such as execution mode specifying the source of the Python code (from a file or stdin).

Now that we have looked into the flow from typing python into the terminal to the beginning of the compilation phase of the input Python code, let’s take a look at how CPython conducts lexical and syntax analysis with its lexer and parser in our next article!

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