lazy-imports is a Python library (current version 1.2.0) designed to facilitate lazy loading of modules and symbols, primarily to reduce application startup times. It provides decorators and functions to defer the actual import process until the imported object is first accessed. The library is actively maintained with updates released as needed.
pip install lazy-importsVerified import paths — ran on the pinned version, not inferred.
This example demonstrates how to lazily import a specific function (`loads` from `json`) using `lazy_import`. The `json` module is only loaded into memory when `loads` is first invoked, illustrating the startup performance benefit.
Use type-checking comments (`if TYPE_CHECKING: import ...`) or stub files (`.pyi`) to provide type information for static analysis without triggering eager imports, or accept reduced IDE support.
Be aware of the deferred loading mechanism. Temporarily replace lazy imports with direct imports for intense debugging sessions, or set breakpoints strategically where the lazy object is first used.
Prioritize refactoring to eliminate circular dependencies. Use lazy imports only as a last resort or for specific performance optimizations where a cycle is unavoidable and well-understood.
Profile your application to ensure that the performance benefits of lazy loading outweigh the first-access overhead in critical paths. Use lazy imports strategically for larger, less frequently accessed modules or for startup-critical paths.
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