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bzrlib/branch.py
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        return format
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    def create_checkout(self, to_location, revision_id=None,
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                        lightweight=False):
 
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                        lightweight=False, accelerator_tree=None):
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        """Create a checkout of a branch.
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        :param to_location: The url to produce the checkout at
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        :param revision_id: The revision to check out
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        :param lightweight: If True, produce a lightweight checkout, otherwise,
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        produce a bound branch (heavyweight checkout)
 
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        :param accelerator_tree: A tree which can be used for retrieving file
 
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            contents more quickly than the revision tree, i.e. a workingtree.
 
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            The revision tree will be used for cases where accelerator_tree's
 
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            content is different.
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        :return: The tree of the created checkout
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        """
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        t = transport.get_transport(to_location)
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            checkout_branch.pull(self, stop_revision=revision_id)
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            from_branch=None
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        tree = checkout.create_workingtree(revision_id,
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                                           from_branch=from_branch)
 
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                                           from_branch=from_branch,
 
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                                           accelerator_tree=accelerator_tree)
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        basis_tree = tree.basis_tree()
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        basis_tree.lock_read()
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        try: