Membership operators (in, not in) in Python - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Check membership in a list

What is the output of this code?

Python

fruits = ['apple', 'banana', 'cherry']
result = 'banana' in fruits
print(result)

A True

B False

C SyntaxError

D None

💡 Hint

Remember, 'in' checks if an item exists inside a list.

The string 'banana' is inside the list fruits, so 'banana' in fruits returns True.

❓ Predict Output

intermediate

Check membership in a string

What is the output of this code?

Python

text = 'hello world'
result = 'z' not in text
print(result)

A True

B False

C TypeError

D SyntaxError

💡 Hint

The 'not in' operator returns True if the item is not found.

The character 'z' is not in the string 'hello world', so 'z' not in text returns True.

❓ Predict Output

advanced

Membership check with dictionary keys

What is the output of this code?

Python

data = {'a': 1, 'b': 2, 'c': 3}
result = 'b' in data
print(result)

A False

B True

C KeyError

D TypeError

💡 Hint

Membership in a dictionary checks keys, not values.

The key 'b' exists in the dictionary data, so 'b' in data returns True.

❓ Predict Output

advanced

Membership check with a tuple

What is the output of this code?

Python

t = (10, 20, 30, 40)
result = 25 not in t
print(result)

A False

B TypeError

C True

D SyntaxError

💡 Hint

The 'not in' operator returns True if the item is not found in the tuple.

The number 25 is not in the tuple t, so 25 not in t returns True.

🧠 Conceptual

expert

Understanding membership with nested lists

Given the code below, what is the output?

Python

nested = [[1, 2], [3, 4], [5, 6]]
result = [3, 4] in nested
print(result)

A False

B TypeError

C SyntaxError

D True

💡 Hint

Membership checks for the exact item in the list, including nested lists.

The list [3, 4] is an element inside the nested list, so '[3, 4] in nested' returns True.