Tuple Packing & Unpacking
Python allows creating tuples without `()` (packing) and assigning tuple elements directly to variables (unpacking). Click the parts to understand.
# Packing (Parentheses optional)
point = 10, 20
# Unpacking (Assigning tuple elements to variables)
x, y = pointIdentify all 8 parts!
Challenge: Given `data = ("Alpha", 101, True)`, write the code to unpack it into variables `name`, `id_num`, and `status`.
Tuple Methods: .index() & .count()
Tuples have few methods because they're immutable. Two useful ones are `.index(value)` (finds first occurrence) and `.count(value)` (counts occurrences). Try them out!
Nested Tuples & Slicing
Tuples can contain other tuples! Access nested elements using multiple indices. Slicing (`[start:end]`) works like lists, creating a *new* tuple.
matrix = ((1, 2), (3, 4))
element = matrix[1][0] # Accesses the number 3Challenge: Given `alphabet = ('a', 'b', 'c', 'd', 'e', 'f')`, write code to get a new tuple containing `('c', 'd', 'e')` using slicing.
Tuples in Action: Function Returns
A common Python pattern is to return multiple values from a function using a tuple. Unpacking makes accessing these results clean and easy.
Scenario: Imagine a function `get_coordinates()` returns a tuple `(x, y, z)`.
# Assume function call returns a tuple
result = get_coordinates() # result might be (15, -5, 10)
Challenge: Write the code to unpack the `result` tuple into variables `pos_x`, `pos_y`, and `pos_z`.
Advanced Mini Missions!
Combine your advanced tuple skills to complete these tasks.
Mission 1: Pack & Unpack Coordinates
Use tuple packing to create a `location` tuple with values "City Hall" and 123. Then, unpack `location` into `place` and `address_num` variables. Print both variables.
Mission 2: Find and Count
Create a tuple `grades = ('B', 'A', 'C', 'A', 'B', 'A')`. First, print how many times 'A' appears using `.count()`. Second, print the index of the *first* 'B' using `.index()`.
Mission 3: Nested Access & Slicing
Create `schedule = (("Mon", "Tue"), ("Wed", "Thu"), ("Fri",))`. First, access and print "Thu". Second, create and print a *slice* containing the first two inner tuples `(("Mon", "Tue"), ("Wed", "Thu"))`.
Module 22 Advanced Practice Complete!
Great job tackling these advanced tuple concepts! You're becoming proficient.
Review the basic practice or watch the video lesson if needed, or move on to the next module!