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a# The inspection module provides the :func:`_sa.inspect` function,
which delivers runtime information about a wide variety
of SQLAlchemy objects, both within the Core as well as the
ORM.
The :func:`_sa.inspect` function is the entry point to SQLAlchemy's
public API for viewing the configuration and construction
of in-memory objects. Depending on the type of object
passed to :func:`_sa.inspect`, the return value will either be
a related object which provides a known interface, or in many
cases it will return the object itself.
The rationale for :func:`_sa.inspect` is twofold. One is that
it replaces the need to be aware of a large variety of "information
getting" functions in SQLAlchemy, such as
:meth:`_reflection.Inspector.from_engine`,
:func:`.orm.attributes.instance_state`, :func:`_orm.class_mapper`,
and others. The other is that the return value of :func:`_sa.inspect`
is guaranteed to obey a documented API, thus allowing third party
tools which build on top of SQLAlchemy configurations to be constructed
in a forwards-compatible way.
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The returned value in some cases may be the
same object as the one given, such as if a
:class:`_orm.Mapper` object is passed. In other
cases, it will be an instance of the registered
inspection type for the given object, such as
if an :class:`_engine.Engine` is passed, an
:class:`_reflection.Inspector` object is returned.
:param subject: the subject to be inspected.
:param raiseerr: When ``True``, if the given subject
does not
correspond to a known SQLAlchemy inspected type,
:class:`sqlalchemy.exc.NoInspectionAvailable`
is raised. If ``False``, ``None`` is returned.
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