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gh-142349: Clarify that sys.lazy_modules may contain extra items #155547

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gh-142349: Clarify that sys.lazy_modules may contain extra items #155547

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21 changes: 17 additions & 4 deletions Doc/library/sys.rst
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Expand Up @@ -1485,11 +1485,24 @@ always available. Unless explicitly noted otherwise, all variables are read-only
.. data:: lazy_modules

A :class:`set` of fully qualified module name strings that have been lazily
imported in the current interpreter but not yet loaded. When a
lazily imported module is accessed for the first time, its name is removed
from this set.
imported in the current interpreter but not yet loaded.
When a lazily imported module is accessed for the first time, its name is
typically removed from this set.

This attribute is intended for debugging and introspection.
The set may contain some additional strings.
It is intended for debugging and introspection, and consumers are expected
to verify each entry's status.

.. impl-detail::

Currently, :data:`!lazy_modules` may also contain:

* names of *attributes* (non-modules), such as ``"pathlib.Path"`` after
running ``lazy from pathlib import Path``, and
* names of items than have already been accessed.

In future versions of Python, these may be removed, and/or additional
extras may be added.

See also :func:`set_lazy_imports` and :pep:`810`.

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