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def __init__(self, branch, pristine_upstream_branch, tree=None,
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"""Create a distribution branch.
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You can only import packages on to the DistributionBranch
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if both tree and pristine_upstream_tree are provided.
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:param branch: the Branch for the packaging part.
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:param tree: an optional tree for the branch.
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:param pristine_upstream_tree: an optional tree for the