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Revision parsing
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.. autoclass:: pygit2.Repository
   :members: revparse, revparse_ext, revparse_single
   :noindex:

You can use any of the fancy `<rev>` forms supported by libgit2::

    >>> commit = repo.revparse_single('HEAD^')

.. autoclass:: pygit2.RevSpec
   :members:


Constants:

.. py:data:: GIT_REVPARSE_SINGLE
.. py:data:: GIT_REVPARSE_RANGE
.. py:data:: GIT_REVPARSE_MERGE_BASE