- Read the guideline before start
You have a list of dicts people, every dict means
a person, it has keys: name, age,
wife/husband - depends on person is male or
female. All names are different. Key
wife/husband can be either None or
name of another person.
-
Define a Class
Person -
The
__init__method should take two parametersname: A string representing the name of the person.age: An integer representing the age of the person.
-
Define a class attribute
peoplein thePersonclass to store instances by theirname.- The keys are the
namevalues of instances. - The values are references to the
Personinstances themselves. - Within the
__init__method, add each newPersoninstance to thepeopledictionary.
- The keys are the
Write function create_person_list, this function
takes list people and return list with
Person instances instead of dicts.
Note:
If person's key wife/husband is not
None - create_person_list should add
attribute wife/husband respectively
to its instance. This attribute should
be a link to a Person instance with name the
same as wife/husband key in person's dict.
Exemplo:
people = [
{"name": "Ross", "age": 30, "wife": "Rachel"},
{"name": "Joey", "age": 29, "wife": None},
{"name": "Rachel", "age": 28, "husband": "Ross"}
]
person_list = create_person_list(people)
isinstance(person_list[0], Person) # True
person_list[0].name == "Ross"
person_list[0].wife is person_list[2] # True
person_list[0].wife.name == "Rachel"
person_list[1].name == "Joey"
person_list[1].wife
# AttributeError
isinstance(person_list[2], Person) # True
person_list[2].name == "Rachel"
person_list[2].husband is person_list[0] # True
# The same as person_list[0]
person_list[2].husband.name == "Ross"
person_list[2].husband.wife is person_list[2] # True
Person.people == {
"Ross": <__main__.Person object at 0x10c20ca60>,
"Joey": <__main__.Person object at 0x10c180a00>,
"Rachel": <__main__.Person object at 0x10c1804f0>
}
class Person: people = {}
def __init__(self, name, age):
self.name = name
self.age = age
Person.people[name] = self
def create_person_list(people): result = [] for person in people: result.append(Person(person['name'], person['age']))
for person, obj in zip(people, result):
if person.get('wife') is not None:
obj.wife = Person.people[person['wife']]
elif person.get('husband') is not None:
obj.husband = Person.people[person['husband']]
return result
people = [ {"name": "Ross", "age": 30, "wife": "Rachel"}, {"name": "Joey", "age": 29, "wife": None}, {"name": "Rachel", "age": 28, "husband": "Ross"} ]
person_list = create_person_list(people)
print(isinstance(person_list[0], Person)) print(person_list[0].name == "Ross") print(person_list[0].wife is person_list[2]) print(person_list[0].wife.name == "Rachel") print(person_list[1].name == "Joey") person_list[1].wife print("Erro") except AttributeError: print("AttributeError OK") print(person_list[2].husband is person_list[0]) print(person_list[2].husband.name == "Ross") print(person_list[2].husband.wife is person_list[2])