check-install 0.1.0

Auto-installs missing Python packages at runtime or startup.

check-install (check_install)

Automatically detect and install missing Python modules at runtime or pre-execution using pip.

📥 Installation

pip install check-install

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💡 What It Does

When imported and invoked early in your Python scripts, check_install scans for missing imports:

• Prompts to install them using pip.
• Restarts the script seamlessly after installation.
• Works both during import time and runtime (ModuleNotFoundError).
• Optionally displays nice output with rich, but works without it.
• Great for prototyping, scratch scripts, or educational notebooks.

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✅ Quick Start

Add this to the very top of your script:

import check_install
check_install.install_hooks_and_preflight()

That’s it! If any module is missing, you’ll be prompted to install it.

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📦 Example

Say your script contains:

import check_install
check_install.install_hooks_and_preflight()
import numpy
import yaml

And you don't have numpy or PyYAML installed — you’ll see an interactive prompt:

Missing Dependencies Detected
Import name     PyPI package
──────────────  ─────────────
numpy           numpy
yaml            PyYAML

Attempt to auto-install missing 2 package(s) now? [Y/n]:

It will install and re-execute the script.

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🧠 How It Works

• Uses ast to statically analyze the current script and extract imports.
• Catches ModuleNotFoundError at runtime using a custom sys.excepthook.
• Attempts installation via subprocess.run([python -m pip install ...]).
• Tracks attempted installations to avoid loops.

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⚠️ Notes

• Meant for dev/test scripts — not production!
• Respects existing venvs, shows interpreter context.
• Maps known import names to their PyPI equivalents (PIL → pillow, etc).
• Requires no external config, arguments, or setup.

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🔒 Security & Safety

• Does not use eval, exec, or shell calls.
• Uses subprocess securely to invoke pip.
• Gracefully exits or restarts using os.execv.

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🚫 Limitations

• Won’t resolve C/C++ build errors or OS-level dependencies.
• Assumes pip is functional and available in the current Python environment.

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🧪 Want Tests?

Let me know and I’ll whip up a test suite for you! 🧪

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📜 License

MIT License — see the LICENSE file for full text.