Checking for Membership Using Python's "in" and "not in" Operators

Python’s in and not in operators allow you to quickly check if a given value is or isn’t part of a collection of values. This type of check is generally known as a membership test in Python. Therefore, these operators are known as membership operators.

By the end of this video course, you’ll understand that:

• The in operator in Python is a membership operator used to check if a value is part of a collection.
• You can write not in in Python to check if a value is absent from a collection.
• Python’s membership operators work with several data types like lists, tuples, ranges, and dictionaries.
• You can use operator.contains() as a function equivalent to the in operator for membership testing.
• You can support in and not in in custom classes by implementing methods like .__contains__(), .__iter__(), or .__getitem__().

What’s Included:

• 10 Lessons
• Video Subtitles and Full Transcripts
• 2 Downloadable Resources
• Accompanying Text-Based Tutorial
• Q&A With Python Experts: Ask a Question
• Certificate of Completion

Downloadable Resources:

• Course Slides (.pdf)
• Sample Code (.zip)

Related Learning Paths:

• Python Control Flow and Loops