Protecting or obfuscating Python source code in PyCharm

Question

Does PyCharm include a built-in tool to compile and encrypt or obfuscate Python source code, similar to PyArmor? If not, what is the recommended approach?

Answer

PyCharm does not include a built-in feature that compiles and encrypts or obfuscates Python source code. There is no equivalent to PyArmor shipped inside the IDE.

Python is an interpreted language, so source code cannot be made completely unreadable. The tools below raise the difficulty of inspection and deter casual reading, but a determined party can still reverse engineer the result.

Running PyArmor from PyCharm

PyArmor is the standard dedicated tool for compiling Python to bytecode and encrypting it. It can be run from inside PyCharm as an external tool:

• Open Settings | Tools | External Tools.
• Add a new tool, specifying the path to the PyArmor executable, its arguments, and the working directory.
• Run it from the Tools menu, or include it as a step in a run configuration.

See Configuring third-party tools in PyCharm and External Tools settings for detailed steps.

Alternatives

Two other tools are commonly used for the same purpose. Nuitka compiles Python code to C and then to a native executable, which provides stronger protection than plain bytecode and can improve runtime performance. Cython compiles selected modules into C extensions (.so or .pyd files), which hides the source of those modules.

Tools that package but do not protect

PyInstaller and cx_Freeze bundle an application into a single executable, but they do not protect the source. The embedded bytecode can be extracted and decompiled. These tools are suited to distribution convenience, not code protection.