Python Tuples and Sets

Why Tuples And Sets Matter

Lists and dictionaries are not the only collection types you need in Python. Tuples and sets help you express different intentions. A tuple is useful when a group of values should stay together and should not be changed. A set is useful when you care about unique values and membership tests.

point = (10, 20)
unique_scores = {80, 90, 80, 75}

print(point)
print(unique_scores)

The tuple keeps the coordinate pair together. The set removes the duplicate 80.

Tuples

A tuple is an ordered collection. You can read items by index, loop over it, and unpack it into variables.

student = ("Asha", 16, "Delhi")

name, age, city = student
print(name)

Tuples are immutable. You cannot change an item after the tuple is created.

student[1] = 17

This raises a TypeError. If you need to change values often, use a list instead.

Single-Item Tuples

The comma creates a single-item tuple.

value = (5,)

Without the comma, (5) is just the integer 5 inside parentheses.

Sets

A set stores unique items with no guaranteed order.

tags = {"python", "quiz", "python"}
print(tags)

The duplicate "python" appears only once.

Use add() to add an item and remove() or discard() to remove one.

tags.add("practice")
tags.discard("old")

discard() does nothing if the item is missing. remove() raises a KeyError if the item is missing.

Set Operations

Sets are excellent for comparisons.

a = {"python", "html", "css"}
b = {"python", "sql"}

print(a | b)
print(a & b)
print(a - b)

| gives the union, & gives the intersection, and - gives items in the first set but not the second.

Common Mistakes

A common tuple mistake is expecting to edit it like a list. Tuples are ordered, but they are immutable.

A common set mistake is expecting the printed order to stay the same. Sets are not designed for positional access or stable ordering. If you need order, use a list.

Another mistake is creating an empty set with {}. That creates an empty dictionary. Use set() for an empty set.

Quick Summary

• Tuples are ordered and immutable.
• Tuple unpacking assigns grouped values to separate names.
• A single-item tuple needs a trailing comma.
• Sets store unique values.
• Sets are useful for membership tests and comparisons.
• Use set() for an empty set.
• Set order should not be relied on.

Practice Quiz

Now practice this topic with MCQs and explanations:

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