Python uses PyInstaller to package exe files, why only spec files are generated?

PyInstaller package failed, only the spec file was generated and the solution

When using PyInstaller to package Python scripts into exe files, sometimes only spec files are generated, but no exe files are generated. This is usually caused by file encoding issues or PyInstaller itself errors. This article will analyze the issue of "using PyInstaller to package Python scripts and only generate spec files".

Problem: The user used the pyinstaller -F -w test.py command to package it, but only got the spec file, and UnicodeDecodeError: 'utf-8' codec can't decode byte 0xbd in position 4: invalid start byte error. This shows that PyInstaller is having encoding issues when processing scripts, it tries to decode using utf-8 but encounters bytes that cannot be decoded. This is usually because the script file encoding is inconsistent with utf-8, such as GB2312.

Invalid attempt:

1. Add encoding declaration # -\*- coding: utf-8 -\*- : If the script file itself is not utf-8 encoding, this method is invalid and may even exacerbate the problem.
2. Modify PyInstaller\\compat.py : Change out = out.decode(encoding) to out = out.decode(encoding, errors='ignore') . This method ignores encoding errors, which may cause data loss or display exceptions, and is not recommended.
3. Setting Code Page chcp 65001 : This changes the console code page, but PyInstaller internal encoding processing is not affected.

Root cause and solution: UnicodeDecodeError clearly states that the encoding of test.py does not match the default utf-8 encoding of PyInstaller. The solution is to make sure that test.py is encoded correctly.

suggestion:

1. Open test.py with text editors that support encoding display (such as Notepad, Sublime Text) and check its encoding.
2. If the encoding is not UTF-8, save it as UTF-8 encoding.
3. Rerun pyinstaller -F -w test.py command.
4. If the problem persists, try other packaging tools, such as nuitka, to troubleshoot problems with PyInstaller itself.

Through the above steps, the problem of PyInstaller packaging only generates spec files. The key is to correctly set the encoding of the script file.

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