{"id":4960,"library":"halo","title":"Halo","description":"Halo is a Python library that provides beautiful terminal spinners, offering visual feedback for long-running operations in command-line applications, IPython, and Jupyter. It is currently at version 0.0.31 and is actively maintained, though new releases are not frequent.","status":"active","version":"0.0.31","language":"en","source_language":"en","source_url":"https://github.com/manrajgrover/halo","tags":["terminal","spinner","cli","progress","loading","ux"],"install":[{"cmd":"pip install halo","lang":"bash","label":"Install stable version"}],"dependencies":[{"reason":"Used for cross-platform terminal coloring, especially on Windows, though not explicitly listed as a PyPI dependency.","package":"colorama","optional":true}],"imports":[{"symbol":"Halo","correct":"from halo import Halo"}],"quickstart":{"code":"import time\nfrom halo import Halo\n\n# Basic usage with a 'with' statement for automatic start/stop and cleanup\nwith Halo(text='Loading data...', spinner='dots', color='cyan') as spinner:\n    time.sleep(2) # Simulate a long-running operation\n    spinner.succeed('Data loaded successfully!')\n\nprint(\"Application continues...\")","lang":"python","description":"The `Halo` class is the primary interface for creating and managing terminal spinners. It can be used directly with `start()` and `stop()` methods, as a context manager (using `with` statement), or as a decorator. The context manager approach is generally recommended for clean resource management."},"warnings":[{"fix":"No direct fix for users; requires library update. Monitor GitHub issues for resolution.","message":"The library internally uses `threading.Thread.setDaemon`, which has been deprecated in Python 3.10 in favor of setting the `daemon` attribute directly. This may lead to deprecation warnings or unexpected behavior in newer Python environments.","severity":"deprecated","affected_versions":"0.0.31 and older (Python 3.10+ environments)"},{"fix":"Avoid changing animated text to a significantly shorter string, or ensure animations are stopped before text changes, particularly if crashes are observed.","message":"There is an open bug where using text animations and then switching to a new message that is shorter than the current animated text can cause a crash.","severity":"breaking","affected_versions":"All versions up to 0.0.31"},{"fix":"Initialize `Halo` with `spinner='dots'` (or another desired spinner) explicitly: `Halo(..., spinner='dots')`.","message":"On Windows operating systems, the default spinner might be 'line' instead of the commonly shown 'dots' spinner due to terminal compatibility. Users should explicitly specify `spinner='dots'` if they want that animation on Windows.","severity":"gotcha","affected_versions":"All versions"},{"fix":"If leading spaces are critical, consider pre-padding the terminal output or using alternative methods for alignment rather than relying on `Halo`'s text parameter for leading spaces.","message":"Text provided to the `Halo` spinner may incorrectly ignore leading spaces, which can affect precise formatting and alignment in the terminal.","severity":"gotcha","affected_versions":"All versions up to 0.0.31"},{"fix":"Test terminal output in your specific CI environment. Consider disabling spinners (`enabled=False`) in CI environments if display issues occur, or check for CI-specific configuration options.","message":"Halo spinners may not render correctly or appear at all in certain continuous integration (CI/CD) environments, such as Jenkins, due to terminal emulation differences.","severity":"gotcha","affected_versions":"All versions"}],"env_vars":null,"last_verified":"2026-04-12T00:00:00.000Z","next_check":"2026-07-11T00:00:00.000Z"}