Learn Tuple Operations | Other Data Types

While tuples themselves cannot be altered, Python provides operations to create and combine them effectively.

Creation

The tuple() function creates a tuple from an iterable object (strings, sets, lists), allowing for the conversion of lists or other iterables into tuples.

Concatenation

You can join two or more tuples into a new tuple using the + operator, allowing you to combine data sequentially without altering the original tuples.

Note

Remember, that to use tuple methods, like count() and index(), you will need to use dot notation, just as we did with list methods.

Let's explore how we can utilize the tuple constructor, concatenation, and tuple methods in a practical application.

Example Application

Imagine you have lists storing items that went on sale over the past 3 months. You need to convert them to tuples, concatenate the tuples, and then determine how many times an item has been put on sale in the last quarter. You also need to determine the index position to locate the first occurrence of an item.


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# Define lists with items that have been put on sale, recording each sale occurrence for different months
janSales_list = ["apples", "oranges", "apples"]
febSales_list = ["bananas", "oranges", "bananas"]
marSales_list = ["apples", "bananas", "apples"]

# Convert the lists to tuples to ensure immutability (unchangeable) 
janSales = tuple(janSales_list)
febSales = tuple(febSales_list)
marSales = tuple(marSales_list)

# Concatenate all monthly sales into a single tuple for the quarter
quarterlySales = janSales + febSales + marSales
print("Consolidated quarterly sales:", quarterlySales)

# Use the `count()` method to determine how many times "apples" have been on sale during the quarter
apples_sale_count = quarterlySales.count("apples")
print("Apples have been on sale:", apples_sale_count, "times.")

# Use the `index()` method to find the first occurrence of "apples" in the quarterly sales
first_apple_sale_index = quarterlySales.index("apples")
print("The first sale of apples this quarter was at index:", first_apple_sale_index)

Task

Swipe to start coding

You are managing the contents of a grocery store shelf using tuples. Your goal is to update the shelf with new items and perform basic analysis, while preserving data integrity (tuples must remain immutable).

Given

An existing tuple shelf1 that represents the current items on the shelf.
A list shelf1_update that contains new items to be added to the shelf.

Steps to Complete

Convert the list shelf1_update into a tuple named shelf1_update_tuple.
Concatenate shelf1_update_tuple with the existing tuple shelf1 to create a new tuple called shelf1_concat.
Count how many times the string "celery" appears in shelf1_concat and store this number in a variable called celery_count.
Find the index of the first occurrence of "celery" in shelf1_concat and store it in a variable called celery_index.

Output Requirements

Print the following lines exactly in this format:

Updated Shelf #1: <shelf1_concat>
Number of Celery: <celery_count>
Celery Index: <celery_index>

Replace <shelf1_concat> with the resulting tuple.
Replace <celery_count> with the number of occurrences of "celery".
Replace <celery_index> with the index of the first "celery" in the tuple.

Solution

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Section 4. Chapter 5

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