Tools like , py2exe , and cx_Freeze solve this by bundling everything the script needs into a single package. When you run a PyInstaller EXE, it performs the following steps:
A file named struct (this contains critical header information).
Extracts internal PYZ archives and .pyc files from PyInstaller EXEs. GitHub Repository
The main entry point file of the original script, usually named my_program or main (without an extension, or ending in .pyc ). Step 2: Fix the Missing Magic Bytes (If Required)
Recommendations for based on your specific Python version. Share public link convert exe to py
If the developer compiled the script using python -O (optimization), the resulting file is a .pyo file. These are harder to decompile as they strip out docstrings and assertions.
pycdc extracted_file.pyc
: A faster tool often used for newer Python versions like 3.10+, where uncompyle6 may struggle.
After running, you get a folder containing .pyc files and other dependencies. Tools like , py2exe , and cx_Freeze solve
Now let's walk through the actual process. I'll assume you're working with a PyInstaller-generated executable, as this is the most common scenario.
Unpacking Python Executables on Windows and Linux - Fortinet
For older Python versions (2.7, 3.0 - 3.8), uncompyle6 is the standard tool.
The most effective, modern decompilation tool for Python 3 environments is ( pycdc ). Step 1: Choose Your Decompiler GitHub Repository The main entry point file of
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If the executable was built using an older version of Python (Python 3.8 or older), uncompyle6 is highly reliable and easy to install directly via pip. Install the tool via your terminal: pip install uncompyle6 Use code with caution. Run the decompiler against your target bytecode file: uncompyle6 -o restored_script.py main.pyc Use code with caution.
When a Python script is packaged into an executable (commonly using tools like PyInstaller, auto-py-to-exe, or cx_Freeze), the Python source code is byte-compiled into .pyc files and bundled with the Python interpreter and required dependencies. This process is essentially one-way.
The Ultimate Guide to Decompiling EXE Files Back to Python Source Code