In this homework you will design a class Dog and save it in a file named dog.py. (Important hint: when you change the file dog.py the changes will not be reflected in an old shell, even if you import dog again. Start a new shell to test your changes.)

Problem 1. Write a class definition line and a one line docstring for the class Dog. Write an __init__ method for the class Dog that gives each dog its own name and breed. Make sure that you test this on a successful creation of a dog object. For example,

>>> import dog >>> sugar = dog.Dog('Sugar', 'border collie') >>> sugar.name Sugar >>> sugar.breed border collie Problem 2. Add a list attribute tricks to each dog and initialize it in __init__ to the empty list. (The user does not have to supply a list of tricks when creating a dog.) Make sure that you test this successfully.

>>> sugar.tricks []

Problem 3. Write a method teach as part of the class Dog. The method teach should add a passed string parameter to tricks and print a message that the dog that knows the trick.

>>> sugar.teach('frisbee') Sugar knows frisbee

Problem 4. Write a method knows as part of the class Dog. The method knows should check whether a passed string parameter is in the dogs list of tricks, print an appropriate message and return True or False.

>>> sugar.knows('frisbee') Yes, Sugar knows frisbee True >>> sugar.knows('arithmetic') No, Sugar doesn't know arithmetic False

Problem 5. Create a data attribute species as part of the class Dog and set its value to 'canis familiaris'. The method species should be defined within the class Dog but outside of any method.

>>> dog.Dog.species 'Canis familiaris' >>> sugar.species 'Canis familiaris'

Plese explain your code for each problem, line by line if possible