programmers sometimes use a dictionary of dictionaries as a simp

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programmers sometimes use a dictionary of dictionaries as a simple database. for example, to keep track of information about famous scientists, they might use something like this:download setdict/dict_of_dicts.py{'jgoodall' : {'surname' : 'goodall' ,'forename' : 'jane' ,'born' : 1934,'died' : none,'notes' : 'primate researcher''author' : ['in the shadow of man' , 'the chimpanzees of gombe' ]},'rfranklin' : {'surname' : 'franklin' ,'forename' : 'rosalind' ,'born' : 1920,'died' : 1957,'notes' : 'contributed to discovery of dna' },'rcarson' : {'surname' : 'carson' ,'forename' : 'rachel' ,'born' : 1907,'died' : 1964,'notes' : 'raised awareness of effects of ddt' ,'author' : ['silent spring' ]}}write a function called db_headings that returns the set of keys used in any of the inner dictionaries. in this example, the function should return set(’author’, ’forename’, ’surname’, ’notes’, ’born’, ’died’).
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