ray/rllib/models/tf/complex_input_net.py

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A .py file contains Python source code in plain text. The Python interpreter reads the file and runs the code directly, without a separate compile step. Developers write scripts, modules, and full programs in this format. A text editor can open and change the file. Python is one of the most used programming languages, thus .py files are common on many systems.

A file extension is only a part of the file name. It does not give a guarantee about the format or the content of a file. But on Windows, the extension selects the program that opens the file.