lazi 1.5.59

A lightweight and extensible way to implement lazy imports globally.

Lazi: Lazy Imports Everywhere

An easy way to implement and track lazy imports globally.

No external dependencies.

Requres Python 3.11.

Usage:

poetry add lazi

"""Automatic lazy loading example.

Install django to run, or change the imports.
"""
import lazi.auto as lazi         # Install import tracking.
import django.test               # Import stuff.
# print(lazi.used_count())         # Count loaded modules. <Not yet re-implemented>
TestCase = django.test.TestCase  # Trigger lazy loading.
# print(lazi.used_count())         # More modules were lazy loaded. <TBD>

python example.py

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"""Manual lazy loading example.
"""
import lazi.core as lazi                # Import Lazi.
django = lazi.lazy("django")            # Import stuff.
django_test = lazi.lazy("django.test")  # Import more stuff.
# print(lazi.used_count())              # Count loaded modules. <TBD>
TestCase = django_test.TestCase         # Trigger lazy loading.
# print(lazi.used_count())              # Module was lazy loaded. <TBD>

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Configuration

The lazi.conf namespace package contains configuration modules that get autoloaded (in import order) by lazi.conf.conf. It is fully decoupled from the rest of the codebase.

As a result, it's possible configure Lazi by creating lazi.conf modules in your project (within the lazi.conf namespace package), and use conf modules provided by other packages.

Configuration is not yet controllable via environment variables, but this is planned for the future. Update: Supported for DEBUG_TRACING.

It's also possible to manually change the configuration at runtime, with the caveat that some variables may have already been used by lazi.core. To avoid this, configure Lazi before importing it:

from lazi.conf import conf
conf.DEBUG_TRACING = 1
import lazi.auto
# ...