solved issue 1713 and issue 1673

Closed Bitbucket Importer requested to merge bitbucket/declined-pr-219 into branch/default

Created originally on Bitbucket by carolman (Carol Man)

Changesets for this Pull Request have not been imported, because it had been already declined on Bitbucket. Marked as closed by the import user.

solved the issue that ast.dict is empty and ast node deepcopy issue

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