Python helper function for making it work both locally and on Vercel is to correctly determine the project's root directory, as Vercel's serverless environment can change the working directory.
The primary cause for import errors on Vercel is often a mismatch between your local development environment's flexibility and Vercel's strict, serverless build process. Beyond the crucial __init__.py file, you need to pay attention to your project's overall structure, the way you write imports, and Vercel's build configuration.
The pyenv: python: command not found error occurs when pyenv is not properly configured to manage your Python versions. The solution is to ensure your shell's configuration files are correctly updated to point to pyenv's shims, which are small executable files that intercept commands like python and pip and redirect them to the correct Python version [4, 5].