Instances as arguments
Related code
class Dog:
"""Represents a dog."""
dog = Dog()
dog.name, dog.age = "Murki", 2
You can use attribute values as part of any expression. For example:
>>> f'Name: {dog.name}, Age: {dog.age}'
Name: Murki, Age: 2
>>> new_age = dog.age ** 3
>>> new_age
8
You can pass an instance as an argument in the usual way. For example:
...
def print_dog(d):
print(f'Name: {d.name}, Age: {d.age}')
print_dog takes a dog as an argument and displays it. To invoke it, you can pass dog as an argument:
... >>> print_point(dog) Name: Murki, Age: 2
def calculate_dogs_birth_year(dog, current_year):
return current_year - dog.age
calculate_dogs_birth_year takes a dog and current year, and returns the year
the dog was born.
... >>> calculate_dogs_birth_year(dog, 2025) 2023
Exercises
Add two attributes to cow1, name and age, where name is a string representing name of the cow, age is an integer representing age of the cow.
Define a function named print_cow that takes a Cow object and prints name and age of the cow as in the following example:
name: Penelope, age: 7
Write a function, get_car_age that takes and a car, and returns its age.
Example:
>>> get_car_age(2025, car1)
5
Write a function, passed_exam, that takes a Student instance,
and returns True if its grade is greater than or equal to 6.
Example:
>>> passed_exam(s1)
True
Write a function, is_small, that takes a Fish instance,
and returns True if its length is less than 10.
Example:
>>> is_small(fish)
False
class Movie:
"""Represents a movie."""
movie1 = Movie()
movie1.title, movie1.year = "Inception", 2010
def movie_age(current_year, movie):
return current_year - movie.year
result = movie_age(2025, movie1)
Given the above script, what is value of result?
Complete execution flow of the following program
class Movie: "Represents a movie" td = Movie() td.title = "Training day" td.duration = 7320 def print_movie(m): print("Title: {}, Duration: {}".format(m.title, m.duration)) print_movie(td)
Exercises
Add three attributes to hen1, name, age and fav_food, where name is a string representing name of the hen, age is an integer representing age of the hen, fav_food is a string representing hen's favorite food.
Define a function named print_hen that takes a Hen object and prints hen's name, age and favorite food as in the following example:
name: Henny Penny, age: 1, favorite food: sunflower seeds
Call print_hen passing hen1 as argument
Define a class, Book.
Create book1 with title = "Think Python" and pages = 325.
Write a function, print_book, that takes a Book instance,
and prints book details as in the below example:
Example:
>>> print_book(book)
title: Think Python, pages: 325
Define a class, Phone.
Create a Phone instance with three attributes: model: str, price: float, and storage: int.
Write a function, describe_phone that takes a Phone instance,
and it prints the phone details as in the below example:
Example:
>>> describe_phone(phone1)
'iPhone with 128GB'
Define a class, City.
Create a city with two attributes: name: str, population: int.
Write a function, is_medium that takes a city,
and returns True if its population is between 100000 and 200000 (including both),
False otherwise. Example:
>>> is_medium(city)
False
class Laptop:
"""Represents a laptop."""
laptop1 = Laptop()
laptop1.brand, laptop1.ram = "HP", 8
def upgrade_ram(laptop):
return laptop.ram * 2
result = upgrade_ram(laptop1)
Given the above script, what is value of result?
Complete execution flow of the following program
class Movie: "Represents a movie" td = Movie() td.title = "Training day" td.duration = 7320 def get_hours(m): return int(m.duration / 3600) print("{} hours".format(get_hours(td)))