various improvements

docs/source/pyapi/exceptions.rst

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+``exceptions``
+==============
+
+.. automodule:: compute.exceptions
+   :members:

docs/source/pyapi/index.rst

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+Python API
+==========
+
+The API allows you to perform actions on instances programmatically. Below is
+an example of changing parameters and launching the `myinstance` instance.
+
+.. code-block:: python
+
+    import logging
+
+    from compute import Session
+
+    logging.basicConfig(level=logging.DEBUG)
+
+    with Session() as session:
+        instance = session.get_instance('myinstance')
+        instance.set_vcpus(4)
+        instance.start()
+        instance.set_autostart(enabled=True)
+
+
+:class:`Session` context manager provides an abstraction over :class:`libvirt.virConnect`
+and returns objects of other classes of the present library.
+
+Entity representation
+---------------------
+
+Entities such as a compute-instance are represented as classes. These classes directly
+call libvirt methods to perform operations on the hypervisor. An example class is
+:class:`Volume`.
+
+The configuration files of various libvirt objects in `compute` are described by special
+dataclasses. The dataclass stores object parameters in its properties and can return an
+XML config for libvirt using the ``to_xml()`` method. For example :class:`VolumeConfig`.
+
+`Pydantic <https://docs.pydantic.dev/>`_ models are used to validate input data.
+For example :class:`VolumeSchema`.
+
+Modules documentation
+---------------------
+
+.. toctree::
+    :maxdepth: 4
+
+    session
+    instance/index
+    storage/index
+    utils
+    exceptions

docs/source/pyapi/instance/guest_agent.rst

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+``guest_agent``
+===============
+
+.. automodule:: compute.instance.guest_agent
+   :members:
+   :special-members: __init__

docs/source/pyapi/instance/index.rst

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+``instance``
+============
+
+.. toctree::
+    :maxdepth: 1
+    :caption: Contents:
+
+    instance
+    guest_agent
+    schemas

docs/source/pyapi/instance/instance.rst

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+``instance``
+============
+
+.. automodule:: compute.instance.instance
+   :members:
+   :special-members: __init__

docs/source/pyapi/instance/schemas.rst

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+``schemas``
+===========
+
+.. automodule:: compute.instance.schemas
+   :members:

docs/source/pyapi/session.rst

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+``session``
+===========
+
+.. automodule:: compute.session
+   :members:
+   :special-members: __init__

docs/source/pyapi/storage/index.rst

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+``storage``
+============
+
+.. toctree::
+    :maxdepth: 1
+    :caption: Contents:
+
+    pool
+    volume

docs/source/pyapi/storage/pool.rst

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+``pool``
+========
+
+.. automodule:: compute.storage.pool
+   :members:
+   :special-members: __init__

docs/source/pyapi/storage/volume.rst

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+``volume``
+==========
+
+.. automodule:: compute.storage.volume
+   :members:
+   :special-members: __init__

docs/source/pyapi/utils.rst

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+``utils``
+=========
+
+``utils.units``
+---------------
+
+.. automodule:: compute.utils.units
+   :members:
+
+``utils.ids``
+-------------
+
+.. automodule:: compute.utils.ids
+   :members: