Question

Problem 2 Define Phone and Contact classes as shown in the class diagram and in example code below. In particular, each Phone object should have a list of Contact objects in its contacts attribute. Contacts are added using the add_contact method. A Phone object can call its text method, which either prints an appropriate string or raises a NotinContactsError if the Contact object is not an element of its contacts attribute. Phone Contact +contacts:list +name:str +add_contact(Contact) +text(Contact) >>> phone = Phone() >>> alice = Contact('Alice') >>> bob = Contact('Bob') >>> phone.add_contact(alice) >>> phone.text(alice) you call Alice >>> phone.text(bob) Traceback (most recent call last): File "<pyshell#32>", line 1, in phone.text(bob) File "/home/profzoom/tmp/foo.py", line 15, in text raise NotInContactsError NotInContactsError

Answer 1

CODE IN PYTHON:

class NotInContactsError(Exception): def __init__(self, value): self.value = value def __str__(self): return(repr(self.value)) class Contact: def __init__(self, name): self.name = name class Phone: def __init__(self): self.contactList = [] def add_contact(self, contact): self.contactList.append(contact) def text(self, contact): flag = False for item in self.contactList: if item.name == contact.name: flag = True break if flag: print("You call {0}".format(contact.name)) else: raise(NotInContactsError("NotInContactError")) phone = Phone() alice = Contact("Alice") bob = Contact("Bob") phone.add_contact(alice) phone.text(alice) phone.text(bob) 

INDENTATION:

class Not InContactsError(Exception): def _init_(self, value): self.value = value __str_(self): return(repr(self.value)) def class Contact: def _init__(self, name): self.name = name class Phone: def_init__(self): self.contactList = [] def add_contact(self, contact): self.contactList.append(contact) def text(self, contact): flag = False for item in self.contactList: if item.name == contact.name: flag = True break if flag: print("You call {@}".format(contact.name)) else: raise(Not InContactsError("Not InContactError")) phone = Phone() alice = Contact("Alice") bob = Contact("Bob") phone. add_contact(alice) phone.text(alice) bhone.text(bob)

OUTPUT:

Contact C:\Users\madhu\venv\Python3.8\Scripts\python.exe D: /PythonWorld/HelloWorld/Contact.py You call Alice Traceback (most recent call last): File "D:/PythonWorld/HelloWorld/Contact.py", line 32, in <module> phone.text(bob) File "D:/PythonWorld/HelloWorld/Contact.py", line 25, in text raise (NotInContactsError("Not InContactError")) __main__. NotInContactsError: 'Not InContactError' Process finished with exit code 1