Screencap – Cross-platform screenshot + annotate

Capture the screen with Ctrl+Cmd+3 (Mac) or Ctrl+Alt+3 (Windows/Linux), then annotate with colors and shapes. Ctrl+S saves to Desktop; Ctrl+C exits.

Requirements

• Python 3.7+
• macOS, Ubuntu (or most Linux), or Windows

Install

From PyPI:

pip install python-cap

From source:

pip install -r requirements.txt

Run

python_cap

Or from source: python python_cap.py

Leave the terminal open. Press Ctrl+Cmd+3 (Mac) or Ctrl+Alt+3 (Windows/Linux) to take a full-screen capture. The annotation window opens with:

• 6 colors – red, blue, green, black, yellow, purple

• Arrow – draw an arrow (drag from start to end)

• Rect – rectangle

• Circle – circle/oval

• Brush – freehand drawing

• Ctrl+S (or Cmd+S on Mac) – save the annotated image to your Desktop as PNG.

• Click Done to close the annotation window. The app keeps running; use the hotkey again to capture another screen.

• Ctrl+C in the terminal stops the program.

Permissions

• macOS: Allow the terminal (or Python) in System Settings → Privacy & Security → Accessibility so the global hotkey works.
• Linux: Some setups need accessibility or input-monitor permissions for global hotkeys.
• Windows: No extra steps usually needed.

Publishing to PyPI

1. Account & token
   Create an account at pypi.org and create an API token (scope: entire account or project-specific).

2. Install build tools (one-time):

   pip install build twine
   

3. Bump version (optional)
   Edit version in pyproject.toml (e.g. 0.1.1) before each release.

4. Build (from project root):

   rm -rf dist build *.egg-info
   python -m build
   

5. Upload:

   twine upload dist/*
   

   When prompted:

   • Username: __token__
   • Password: your PyPI API token

   Or use env vars (no prompt):

   export TWINE_USERNAME=__token__
   export TWINE_PASSWORD=pypi-YourTokenHere
   twine upload dist/*
   

6. Test install (optional):

   pip install python-cap --force-reinstall
   python-cap
   

If the name python-cap is taken on PyPI, change name in pyproject.toml to a unique name, then rebuild and upload again.