What is a Set?

A set is a collection of unique items — it automatically removes duplicates. Sets are unordered and use curly braces {}.

Example:

fruits = {"apple", "banana", "cherry", "apple"}
# Even though "apple" appears twice, the set stores it once.

Basic Set Operations

• Create a set:
  colors = {"red", "green", "blue"}
• Add an item:
  colors.add("yellow")
• Remove an item:
  colors.remove("green")
• Check membership:
  "red" in colors returns True

Why Sets Matter in Analytics

Sets are useful for finding unique values in a dataset — for example, unique customers, product categories, or error codes.

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