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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_identifier_input(self, identifier_data):
 """Convert the various formats of input identifier_data into the proper json format expected by the ApiClient fetch method, which is a list of dicts."""


        identifier_input = []

        if isinstance(identifier_data, list) and len(identifier_data) > 0:
            # if list, convert each item in the list to json
            for address in identifier_data:
                identifier_input.append(self._convert_to_identifier_json(address))
        else:
            identifier_input.append(self._convert_to_identifier_json(identifier_data))

        return identifier_input