{"id":5780,"library":"lazify","title":"Lazify","description":"Lazify aims to be the defacto standard and most complete library for Python tools related to lazy evaluation. It is designed for deferred computation, evaluating expressions or attributes only when they are first accessed. The current version is 0.4.0, released in 2018, indicating a lack of active maintenance and a very slow release cadence.","status":"maintenance","version":"0.4.0","language":"en","source_language":"en","source_url":"https://github.com/numberly/lazify","tags":["lazy evaluation","deferred computation","performance","attribute"],"install":[{"cmd":"pip install lazify","lang":"bash","label":"Install latest version"}],"dependencies":[],"imports":[{"note":"Decorator for lazy evaluation of methods.","symbol":"lazy","correct":"from lazify import lazy"},{"note":"Class for creating lazy objects that evaluate an expression upon first access.","symbol":"LazyProxy","correct":"from lazify import LazyProxy"}],"quickstart":{"code":"from lazify import LazyProxy, lazy\n\n# Example 1: LazyProxy for deferred expression evaluation\ndef expensive_calculation():\n    print(\"  [TRACE] Performing expensive calculation inside function...\")\n    return 42\n\nprint(\"Creating LazyProxy object...\")\nlazy_value = LazyProxy(expensive_calculation)\nprint(\"LazyProxy created, but calculation not yet performed.\")\n\nprint(f\"First access to lazy_value: {lazy_value}\") # This triggers the calculation\nprint(f\"Second access to lazy_value: {lazy_value}\") # This uses the cached result\n\nprint(\"\\n\" + \"-\" * 20 + \"\\n\")\n\n# Example 2: @lazy decorator for lazy attributes in a class\nclass MyClass:\n    def __init__(self, initial_value):\n        self._initial_value = initial_value\n\n    @lazy\n    def processed_value(self):\n        print(f\"  [TRACE] Processing value {self._initial_value} with decorator...\")\n        return self._initial_value * 2\n\nobj = MyClass(10)\nprint(\"MyClass instance created, 'processed_value' not yet computed.\")\n\nprint(f\"First access to obj.processed_value: {obj.processed_value}\") # This triggers the processing\nprint(f\"Second access to obj.processed_value: {obj.processed_value}\") # This uses the cached result","lang":"python","description":"This quickstart demonstrates how to use `LazyProxy` for general lazy evaluation and the `@lazy` decorator for lazy attributes within classes. The decorated method or proxied function is only executed upon its first access, and its result is then cached for subsequent calls."},"warnings":[{"fix":"Consider evaluating alternatives if active development and support are critical for your project. If using `lazify`, thoroughly test its compatibility and behavior in your specific environment.","message":"The `lazify` library has not been updated since June 2018. This indicates a lack of active maintenance, meaning it may not receive bug fixes, security patches, or new features. Users should be aware of potential long-term support issues.","severity":"gotcha","affected_versions":"<=0.4.0"},{"fix":"Test `lazify` thoroughly with your target Python version. If issues arise, consider pinning an older, compatible Python version or refactoring your code to use an alternative lazy evaluation mechanism.","message":"While PyPI metadata states compatibility with Python 2 and 3, the last release was in 2018. There is a high likelihood of encountering compatibility issues with modern Python versions (e.g., Python 3.9+) that have introduced new syntax or removed deprecated features not present in 2018.","severity":"gotcha","affected_versions":"0.4.0 (with Python >= 3.9)"},{"fix":"Ensure that `lazify` aligns with your specific use case. If you intend to lazily load modules, investigate Python's `importlib.util.LazyLoader` or other dedicated 'lazy import' solutions.","message":"This library focuses on lazy *evaluation* of expressions and object attributes, not on dynamically loading entire Python *modules* only when they are first used (a concept sometimes referred to as 'lazy import'). While related to performance, `lazify`'s scope is distinct from tools designed for deferred module loading.","severity":"gotcha","affected_versions":"All"}],"env_vars":null,"last_verified":"2026-04-14T00:00:00.000Z","next_check":"2026-07-13T00:00:00.000Z"}