Question

我的代码中的“get_info”部分遇到了一些问题。具体来说，只要我输入自身部分，我的get_info就会工作，它对应于类中的实例，即

x=Person('Joe', 'Schmoe', '123-456-7890')
x.get_info()

但是，我不确定如何通过搜索姓氏来显示联系人的信息。据我所知，类不可迭代，所以我不能使用for循环。很明显，我的代码的底部有一些问题，从“elif x == 2：”开始，这是我的代码：

class Person:
    def __init__(self, first_name, last_name, phone_number):
        self.first_name=first_name
        self.last_name=last_name
        self.phone_number=phone_number
        print("Initialized Person: ", self.first_name)
    def get_info(self):
        print(self.first_name, self.last_name, self.phone_number)

class Friend(Person):
    def __init__(self, first_name, last_name, phone_number, email, birth_date):
        Person.__init__(self, first_name, last_name, phone_number)
        self.email = email
        self.birth_date = birth_date
        print("Initialized Friend:", self.first_name)
    def get_info(self):
        print(self.first_name, self.last_name, self.phone_number, self.email, self.birth_date)

def main():
    exitprogram=False
    a=("1. Add Contact")
    b=("2. Lookup Contact")
    c=("3. Exit Program")
    while exitprogram==False:
        print(a)
        print(b)
        print(c)
        x=(int(input("Please select a number: ")))
        if x==1:
            a1=("1. Add Regular Person")
            a2=("2. Add Friend")
            print(a1)
            print(a2)
            y=(int(input("Please select a number: ")))
            if y==1:
                f=(input("Please enter the first name: "))
                l=(input("Please enter the last name: "))
                p=(input("Please enter the phone number: "))
                new=Person(f, l, p)
            elif y==2:
                f=(input("Please enter the first name: "))
                l=(input("Please enter the last name: "))
                p=(input("Please enter the phone number: "))
                e=(input("Please enter the email address: "))
                b=(input("Please enter the birth date in m/d/year format: "))
                new=Friend(f, l, p, e, b)
        elif x==2:
            w=(input("Please enter the last name of the contact you wish to view: "))
            w=Person.get_info(w)
        elif x==3:
            exitprogram=True
main()

Answer 1

如果你使它们可迭代，那么这些类是可迭代的，但这对你没有帮助。你需要保留一份人员名单：

people = []

当你创建一个新人时，将它们添加到列表中：

person = Person(firstname, lastname, phone)
people.append(person)

现在，您可以搜索人员列表：

def search(people, lastname):
    for person in people:
        if person.lastname == lastname:
            return person

    return False

Answer 2

您需要将联系人存储在列表中。例如：

contacts = []
# To add a contact:
contacts.append(Person(...))

如果你这样做，当然，你可以像任何其他列表一样遍历它：

for person in contacts:
    if person.last_name == requested_last_name:
        person.get_info()

作业：Python 3.3：通过属性调用类实例

2 个答案: