Always respect software licenses and copyright laws. Reverse engineering proprietary software without permission may violate Terms of Service or intellectual property rights.
| Obstacle | Why It Fails | |----------|---------------| | | Tools like PyArmor encrypt bytecode, making extraction pointless without the decryption key. | | Custom Packers | Some developers pack EXEs with UPX or custom loaders that hide Python structures. | | C/C++ Compiled EXEs | You cannot get Python code from a non-Python EXE. | | Python Version Mismatch | Decompilers lag behind new Python versions (e.g., 3.11, 3.12). | | Partial Recovery | You might get only 70-90% of the code; the rest may be missing or corrupted. |
The uncompyle6 project explicitly states: "Do not use the tool for unethical or illegal purposes". Similarly, experts recommend: "Only deobfuscate code you wrote, own, or have explicit written permission to analyze".
A file named struct (this contains critical header information).
Another alternative that supports cross-platform compilation. The decompilation approach for cx_Freeze is similar—you extract the contents and then decompile the .pyc files. convert exe to py
To reverse the process, you can use these community-standard tools:
: If the original developer used an "obfuscator," the resulting code may be nearly impossible to understand even after successful decompilation. Are you trying to recover your own lost source code , or are you looking to reverse-engineer a specific tool?
Open a known-working .pyc file (from the same extracted folder) in a hex editor like HxD . Copy the first 12–16 bytes (the header).
Inside the extracted folder, look for a file with no extension (or .pyc ) that matches your original script name. Always respect software licenses and copyright laws
Before we dive into techniques, understand when this process is legal and ethical:
Once you have the .pyc file, use a decompiler like uncompyle6 or pycdc to turn it back into readable Python source code.
Converting an executable ( ) file back into Python source code ( ) is a process known as decompilation
To successfully convert a Python-based .exe back into a .py file, you must treat the file through two distinct phases: | | Custom Packers | Some developers pack
Because the original code is just packed inside the executable container, we can extract the embedded .pyc bytecode files and decompile them back into readable .py source code. Step 1: Extract the Bytecode (.pyc) from the EXE
When a user runs the .exe , it extracts these files to a temporary directory and runs the bytecode using the embedded interpreter.
This creates a directory named your_program.exe_extracted containing all the extracted files.