String representation methods in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the string representation of the object using the __str__ method.

Python

class Person:
    def __init__(self, name):
        self.name = name
    def __str__(self):
        return f"Person: {self.[1]"

p = Person("Alice")
print(str(p))

Drag options to blanks, or click blank then click option'

Aself

Bage

Cname

Drepr

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'age' instead of 'name' which does not exist.

Using 'repr' which is a different method.

Using 'self' directly inside the f-string.

The __str__ method returns a string representation of the object. Here, self.name is used to show the person's name.

2fill in blank

medium

Complete the code to define the __repr__ method that returns a string with the class name and the name attribute.

Python

class Person:
    def __init__(self, name):
        self.name = name
    def __repr__(self):
        return f"Person(name=[1])"

p = Person("Bob")
print(repr(p))

Drag options to blanks, or click blank then click option'

Aself.name

Bname

Cself

Drepr

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'name' without 'self.' which causes a NameError.

Using 'repr' which is a method, not an attribute.

Using 'self' directly which is not a string.

The __repr__ method should return a string that looks like valid Python code to recreate the object. Using self.name shows the name attribute.

3fill in blank

hard

Fix the error in the __str__ method to correctly return the name attribute as a string.

Python

class Animal:
    def __init__(self, species):
        self.species = species
    def __str__(self):
        return self.[1]

cat = Animal("Cat")
print(str(cat))

Drag options to blanks, or click blank then click option'

Aspecies()

Bself.species()

Cstr(species)

Dspecies

Attempts:

3 left

💡 Hint

Common Mistakes

Calling the attribute like a function with parentheses.

Trying to convert the attribute with str() unnecessarily.

Using 'self.species()' which causes a TypeError.

The attribute species is a string, so returning self.species directly works. Using parentheses like a function call causes an error.

4fill in blank

hard

Fill both blanks to create a __repr__ method that returns a string with the class name and the species attribute in quotes.

Python

class Animal:
    def __init__(self, species):
        self.species = species
    def __repr__(self):
        return f"Animal('[1]')"

bird = Animal("Bird")
print(repr(bird))

Drag options to blanks, or click blank then click option'

Aself.species

Bspecies

Cself.species.upper()

Drepr(self.species)

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'species' without 'self.' which causes an error.

Using 'self.species.upper()' which changes the string.

Using 'repr(self.species)' which adds extra quotes.

The __repr__ method should return a string that looks like valid Python code. Using self.species inside the f-string shows the species attribute.

5fill in blank

hard

Fill all three blanks to create a class with __str__ and __repr__ methods that show the name and age attributes properly.

Python

class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age
    def __str__(self):
        return f"Name: [1], Age: [2]"
    def __repr__(self):
        return f"Person(name=[3], age={{self.age}})"

p = Person("Eve", 30)
print(str(p))
print(repr(p))

Drag options to blanks, or click blank then click option'

Aself.name

Bself.age

Dname

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'name' or 'age' without 'self.' which causes errors.

Mixing up the order of attributes in the f-string.

Using variable names that are not defined.

The __str__ method uses self.name and self.age to show the person's details. The __repr__ method uses self.name and self.age to return a string that looks like code to recreate the object.