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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 __update_stack_with_isotopes_infos(self, stack: dict):
 """retrieve the isotopes, isotopes file names, mass and atomic_ratio from each element in stack"""

        for _key in stack:
            _elements = stack[_key]['elements']
            for _element in _elements:
                _dict = _utilities.get_isotope_dicts(element=_element, database=self.database)
                stack[_key][_element] = _dict

        stack = self.__fill_missing_keys(stack=stack)
        return stack