Module 3: Operators in Python

Membership Operators

Membership operators check whether something is inside a collection: in and not in. You will use these with lists, strings, and more.

About 6 minutes

Example code

fruits = ["apple", "banana", "mango"]
print("banana" in fruits)      # True
print("grape" not in fruits)   # True

word = "Python"
print("P" in word)  # True

in checks inside a container

["apple", "banana"]

list

↓

"banana" in list?

True

Practice

Make a list of three colors. Check if 'blue' is in the list.

Key takeaways

in returns True if the item exists inside the collection.
not in is the opposite.
Works on lists, strings, and other sequences.

Quick check: Membership Operators

Question 1 of 2

"a" in "cat" returns?