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d� Zdd� Zdd� Zdd� Zejdd� �ZdS )a� Lazy loading for Python 3.6 and above.
This uses the new importlib finder/loader functionality available in Python 3.5
and up. The code reuses most of the mechanics implemented inside importlib.util,
but with a few additions:
* Allow excluding certain modules from lazy imports.
* Expose an interface that's substantially the same as demandimport for
Python 2.
This also has some limitations compared to the Python 2 implementation:
* Much of the logic is per-package, not per-module, so any packages loaded
before demandimport is enabled will not be lazily imported in the future. In
practice, we only expect builtins to be loaded before demandimport is
enabled.
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``ModuleSpec`` has a ``loader`` attribute, which is called to actually
load a module.
Our class wraps an existing finder and overloads its ``find_spec()`` to
replace the ``loader`` with our lazy loader proxy.
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