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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_filetypes(self):
 # type: () -> List[str] """Return list of filetypes in your data Returns: List[str]: List of filetypes """

        if not self.is_requestable():
            return [resource.get_file_type() for resource in self.get_resources()]
        return self._get_stringlist_from_commastring('file_types')