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Add Set Items

2 min read ·

Sets in Python are mutable, which means you can add new elements after the set is created. However, sets only store unique values, so duplicates are ignored automatically.
This topic covers all valid ways to add items to a set, along with important rules and edge cases.

Add One Item Using add()

The add() method adds a single element to the set.

Syntax

Example

Adding a duplicate:
The set remains unchanged.

Add Multiple Items Using update()

The update() method adds multiple elements from an iterable.

Syntax

Example with List

Example with Tuple

Example with Another Set

Add Characters from String (Important)

Each character is added separately.

Add Items Conditionally

Add Items Using Loop

Add Items to Frozen Set (Not Allowed)

Frozen sets are immutable.

Common Mistakes

Using append() on a Set

Sets do not support append().

Adding Mutable Items

Only hashable items are allowed.

Important Rules

  • Duplicate values are ignored
  • Order is not preserved
  • Only immutable items can be added
  • add() → single item
  • update() → multiple items