New submission from Nick Coghlan <[email protected]>:
While importlib provides all the *pieces* to implement lazy imports, we don't
actually provide a clear way of chaining them together into a lazy import
operation. Without any error checking, that looks like:
import sys
import importlib.util
def lazy_import(name):
spec = importlib.util.find_spec(name)
loader = importlib.util.LazyLoader(spec.loader)
spec.loader = loader
module = importlib.util.module_from_spec(spec)
sys.modules[name] = module
loader.exec_module(module)
return module
>>> lazy_typing = lazy_import("typing")
>>> lazy_typing.TYPE_CHECKING
False
I'm thinking it may make sense to just provide a robust implementation of that,
and accept that it may lead to some bug reports that are closed with "You need
to fix the module you're loading to be compatible with lazy imports"
----------
messages: 307370
nosy: ncoghlan
priority: normal
severity: normal
status: open
title: Provide importlib.util.lazy_import helper function
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Python tracker <[email protected]>
<https://bugs.python.org/issue32192>
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