familytree.py

#Single Gold Star

#Family Trees

#In the lecture, we showed a recursive definition for your ancestors. For this
#question, your goal is to define a procedure that finds someone's ancestors,
#given a Dictionary that provides the parent relationships.

#Here's an example of an input Dictionary:

ada_family = { 'Judith Blunt-Lytton': ['Anne Isabella Blunt', 'Wilfrid Scawen Blunt'],
              'Ada King-Milbanke': ['Ralph King-Milbanke', 'Fanny Heriot'],
              'Ralph King-Milbanke': ['Augusta Ada King', 'William King-Noel'],
              'Anne Isabella Blunt': ['Augusta Ada King', 'William King-Noel'],
              'Byron King-Noel': ['Augusta Ada King', 'William King-Noel'],
              'Augusta Ada King': ['Anne Isabella Milbanke', 'George Gordon Byron'],
              'George Gordon Byron': ['Catherine Gordon', 'Captain John Byron'],
              'John Byron': ['Vice-Admiral John Byron', 'Sophia Trevannion'] }

#Define a procedure, ancestors(genealogy, person), that takes as its first input
#a Dictionary in the form given above, and as its second in put the name of a
#person. It should return a list giving all the known ancestors of the input
#person (this should be the empty list if there are none). The order of the list
#does not matter and duplicates will be ignored.

def ancestors(genealogy, person):
    if person in genealogy:
        relatives = genealogy[person]
    else:
        return []
    for i in relatives:
        if i in genealogy:
            new = genealogy[i]
            for j in new:
                if j not in relatives:
                    relatives.append(j)



    return relatives


#Here are some examples:

#print ancestors(ada_family, 'Augusta Ada King')
#>>> ['Anne Isabella Milbanke', 'George Gordon Byron',
#    'Catherine Gordon','Captain John Byron']

#print ancestors(ada_family, 'Judith Blunt-Lytton')
#>>> ['Anne Isabella Blunt', 'Wilfrid Scawen Blunt', 'Augusta Ada King',
#    'William King-Noel', 'Anne Isabella Milbanke', 'George Gordon Byron',
#    'Catherine Gordon', 'Captain John Byron']

#print ancestors(ada_family, 'Dave')
#>>> []