Distribute python code with python inside to avoid installation

ALai 0
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I have built a bundled Python application that is a composition of an installed (i.e. "*.exe", via pyinstaller) and a code (i.e. "*.py") part. This is due to a package that does not support installation, thus I have to call it directly from source.

I am able to distribute and run the application by including in the bundle my environment in .\venv and running the code via .\venv\Scripts\python.exe my_script.py, however it requires Python installed onto the machine, raising an Error otherwise

No Python at 'C:\Python38\python.exe'

Is there a way to include Python38 folder in my package to allow anyone to start the application regardless of Python installed or not (and its version)? I've tried to:

  • copy Python38 folder within package and within .\venv\Scripts\ hoping that .\venv\Scripts\python.exe was searching there before looking in C:\ -> not working
  • include Python38 in my package and force its copy in C:\ as the very first instruction -> it works, but it seems like cheating, and it may mess up things on recipient's computer
pyinstaller installation python
1 Answers

I managed to solve the problem in a somehow easy way:

  • include Python38 in my package together with my venv (obviously, they cause the destination folder to grow in size, but it is not a big issue for my purposes)
  • update .\venv\pyvenv.cfg changing from absolute path to Python on my computer to a relative path inside the destination folder

Here a reference to the updated pyvenv.cfg:

home = .\Python38                          <-- updated: it was "C:\Python38"
implementation = CPython
version_info = 3.8.5.final.0
virtualenv = 20.4.7
include-system-site-packages = false
base-prefix = .\Python38                   <-- updated
base-exec-prefix = .\Python38              <-- updated
base-executable = .\Python38\python.exe    <-- updated

FYI, here the code I used to automatically update the pyvenv.cfg, that works with different python versions and paths:

import os
import re
from configparser import ConfigParser

# Set original and updated config paths
venv_cfg = 'pyvenv.cfg'
in_venv_cfg = os.path.join('.', 'venv', venv_cfg)
out_venv_cfg = os.path.join('.', 'config', venv_cfg)  # changing folder to avoid override of venv config

# Parse data in config
with open(in_venv_cfg, 'r') as f:
    config_lines = f.readlines()
config = ConfigParser()
config.read_string('[cfg]\n' + ''.join(config_lines))

# Get python version and location
py_path = config.get('cfg', 'home')
py_dir, py_name = os.path.dirname(py_path), os.path.basename(py_path)

# Update paths to python and save venv configuration
new_config_lines = [re.sub(r'(=\s*)' + py_dir.replace("\\", r"\\") + f'({py_name})', r'\1.\\\2', line) for line in config_lines]
with open(out_venv_cfg, 'w') as f:
    f.writelines(new_config_lines)
ALai0
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