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bzrlib/branch.py
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        return InterBranch.get(self, target).push(overwrite, stop_revision,
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            *args, **kwargs)
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    def lossy_push(self, target, stop_revision=None):
 
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        """Push deltas into another branch.
 
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        :note: This does not, like push, retain the revision ids from 
 
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            the source branch and will, rather than adding bzr-specific 
 
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            metadata, push only those semantics of the revision that can be 
 
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            natively represented by this branch' VCS.
 
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        :param target: Target branch
 
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        :param stop_revision: Revision to push, defaults to last revision.
 
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        :return: Dictionary mapping revision ids from the target branch 
 
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            to new revision ids in the target branch, for each 
 
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            revision that was pushed.
 
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        """
 
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        inter = InterBranch.get(self, target)
 
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        lossy_push = getattr(inter, "lossy_push", None)
 
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        if lossy_push is None:
 
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            raise errors.LossyPushToSameVCS(self, target)
 
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        return lossy_push(stop_revision)
 
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    def basis_tree(self):
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        """Return `Tree` object for last revision."""
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        return self.repository.revision_tree(self.last_revision())