Checking identity (is, is not) in PyTest - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if two variables refer to the same object using identity operator.

PyTest

def test_identity():
    a = [1, 2, 3]
    b = a
    assert a [1] b

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

Ais not

B==

Cis

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' instead of 'is' for identity check.

The is operator checks if two variables point to the same object in memory.

2fill in blank

medium

Complete the code to assert two variables do NOT refer to the same object.

PyTest

def test_not_identity():
    a = [1, 2, 3]
    b = [1, 2, 3]
    assert a [1] b

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

Ais

Bis not

C==

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Using '!=' instead of 'is not' for identity check.

The is not operator checks that two variables do not point to the same object.

3fill in blank

hard

Fix the error in the assertion to correctly check identity.

PyTest

def test_identity_error():
    a = None
    b = None
    assert a [1] b

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

Ais

Bis not

C!=

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' instead of 'is' to compare with None.

Use is to check if both variables point to the same None object.

4fill in blank

hard

Fill both blanks to create a test that asserts two variables are not the same object and have equal content.

PyTest

def test_not_same_but_equal():
    a = [1, 2]
    b = [1, 2]
    assert a [1] b
    assert a [2] b

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

A==

Bis

Cis not

D!=

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up 'is' and '==' operators.

The first assertion checks equality of content with ==, the second checks that they are different objects with is not.

5fill in blank

hard

Fill all three blanks to complete the test checking identity and inequality correctly.

PyTest

def test_identity_and_equality():
    x = 'hello'
    y = ''.join(['h', 'e', 'l', 'l', 'o'])
    assert x [1] y
    assert x [2] y
    assert x [3] y

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

A!=

B==

Cis not

Dis

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing identity and equality operators.

x and y have the same content but are different objects. So is not is true, == is true, and != is false.