Lecture 5 : Tuples in Python | Python Full Course Free

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Python Tuples
A tuple in Python is a collection of items that is:

Ordered: The items have a defined order.
Immutable: Once a tuple is created, its elements cannot be changed, added, or removed.
Allows Duplicates: Like lists, tuples can have repeated items.
Creating a Tuple
Tuples are defined using parentheses () with items separated by commas.

Examples:

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# Empty tuple
empty_tuple = ()

# Tuple with one item (comma is required)
single_item = (5,)

# Tuple with multiple items
numbers = (1, 2, 3, 4)
fruits = ("apple", "banana", "cherry")

# Mixed data types
mixed = (10, "hello", True, 3.14)

# Nested tuple
nested = (1, 2, (3, 4))
Accessing Tuple Elements
You can access tuple elements using their index, similar to lists. Indexing starts at 0.

Examples:

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fruits = ("apple", "banana", "cherry")

# Accessing elements
print(fruits[0]) # Output: apple
print(fruits[2]) # Output: cherry

# Negative indexing (from the end)
print(fruits[-1]) # Output: cherry
Immutable Nature
Tuples cannot be modified after creation, which means:

No adding or removing items.
No changing existing items.
However, you can:

Reassign the entire tuple:

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fruits = ("apple", "banana")
fruits = ("cherry", "mango") # Reassign a new tuple
Modify mutable elements within a tuple: If a tuple contains mutable objects (like lists), those objects can be changed.

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nested = (1, [2, 3], 4)
nested[1][0] = 99
print(nested) # Output: (1, [99, 3], 4)
Tuple Operations
Length of a Tuple:

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print(len(fruits)) # Output: 3
Check if an Item Exists:

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print("apple" in fruits) # Output: True
Concatenate Tuples:

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tuple1 = (1, 2)
tuple2 = (3, 4)
combined = tuple1 + tuple2
print(combined) # Output: (1, 2, 3, 4)
Repeat a Tuple:

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print((1, 2) * 3) # Output: (1, 2, 1, 2, 1, 2)
Unpacking a Tuple
You can assign the items of a tuple to variables directly.

Example:

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fruits = ("apple", "banana", "cherry")
a, b, c = fruits
print(a) # Output: apple
print(b) # Output: banana
print(c) # Output: cherry

# Using *
numbers = (1, 2, 3, 4, 5)
x, *y, z = numbers
print(x) # Output: 1
print(y) # Output: [2, 3, 4]
print(z) # Output: 5
Tuple Methods
Tuples have two built-in methods:

Method Description
count(x) Returns the number of times x appears in the tuple
index(x) Returns the first index of x
Example:

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numbers = (1, 2, 2, 3, 4, 2)
When to Use Tuples
When you need an immutable collection of items.
When you want to ensure the data cannot be modified by mistake.
For faster lookups compared to lists in certain scenarios.
Summary Table
Feature Tuple
Ordered Yes
Mutable No
Duplicates Allowed
Indexing Yes (positive and negative)
Common Uses Fixed data, coordinates, constants
Would you like detailed examples for any specific tuple operations? 😊

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