#6046 [BUG] `LAZY_MODULES` is populated with modules, not strings. Issue created by patrick-kidger Describe the bug On this line: https://github.com/flyteorg/flytekit/blob/6f8b9a09c24b22553e249308abb36b14ff6a6876/flytekit/lazy_import/lazy_module.py#L21 Then

module_name not in LAZY_MODULES

will always return

True

as the list is populated with modules, not module names (i.e. strings). That means that this check: https://github.com/flyteorg/flytekit/blob/6f8b9a09c24b22553e249308abb36b14ff6a6876/flytekit/core/type_engine.py#L1264-L1266 will actually import all of pandas. This is slow. Expected behavior I think the check you probably want here instead is

object.__getattribute__(module, "__class__") is not importlib.util._LazyModule

. Additional context to reproduce No response Screenshots No response Are you sure this issue hasn't been raised already? • Yes Have you read the Code of Conduct? • Yes flyteorg/flyte