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Lists and Loops

Just like in music, where repetition and practice are key to mastering skills, understanding how to use lists and loops in Python is essential for efficient data handling and analysis. Whether you're managing a list of song titles or iterating through a playlist, mastering these concepts will significantly enhance your coding abilities.

In Python, a list is a versatile data structure that allows you to store multiple items in a single variable. Think of it as a playlist, where each song (or item) has a specific position. Lists are defined using square brackets [], and items are separated by commas.


python

Lists are incredibly useful for organizing data, and you can easily access, modify, and iterate over their elements. For instance, you can access the first song in the list using an index:


              123
            
playlist = ["Bohemian Rhapsody", "Imagine", "Stairway to Heaven"]
first_song = playlist[0]
print(first_song)

Loops in Python allow you to repeat a block of code multiple times. The most common type of loop is the for loop, which is perfect for iterating over lists.

This loop will print each song's title from the playlist list. It's like announcing each song in a concert setlist.


              123
            
playlist = ["Bohemian Rhapsody", "Imagine", "Stairway to Heaven"]
for song in playlist:
    print(song)

You can also use loops to perform calculations or modify list elements. Imagine you have a list of track durations and want to calculate the total duration:


              1234567
            
durations = [354, 183, 482]  # durations in seconds
total_duration = 0

for duration in durations:
    total_duration += duration

print("Total Duration:", total_duration, "seconds")

Task

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Complete the filter_genres_by_length function that filters a sorted list of track genres by popularity and returns the first max_to_return genres with names longer than min_length symbols. This function is useful for organizing and displaying genre information based on specific criteria.

Inputs:

genres: A list of strings representing track genres, sorted by popularity.
min_length: An integer representing the minimum length of genre names to include.
max_to_return: An integer representing the maximum number of genres to return.

Steps:

Filter Genres: Iterate over the genres list and check if the length of each genre name is greater than or equal to min_length. If so, add it to the result list.
Limit Results: Stop adding genres once the result list reaches the specified max_to_return length.

Solution

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Section 1. Chapter 4

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Lists and Loops


python

Lists are incredibly useful for organizing data, and you can easily access, modify, and iterate over their elements. For instance, you can access the first song in the list using an index:


              123
            
playlist = ["Bohemian Rhapsody", "Imagine", "Stairway to Heaven"]
first_song = playlist[0]
print(first_song)

Loops in Python allow you to repeat a block of code multiple times. The most common type of loop is the for loop, which is perfect for iterating over lists.

This loop will print each song's title from the playlist list. It's like announcing each song in a concert setlist.


              123
            
playlist = ["Bohemian Rhapsody", "Imagine", "Stairway to Heaven"]
for song in playlist:
    print(song)

You can also use loops to perform calculations or modify list elements. Imagine you have a list of track durations and want to calculate the total duration:


              1234567
            
durations = [354, 183, 482]  # durations in seconds
total_duration = 0

for duration in durations:
    total_duration += duration

print("Total Duration:", total_duration, "seconds")

Task

Swipe to start coding

Inputs:

genres: A list of strings representing track genres, sorted by popularity.
min_length: An integer representing the minimum length of genre names to include.
max_to_return: An integer representing the maximum number of genres to return.

Steps:

Filter Genres: Iterate over the genres list and check if the length of each genre name is greater than or equal to min_length. If so, add it to the result list.
Limit Results: Stop adding genres once the result list reaches the specified max_to_return length.

Solution

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 1. Chapter 4

Switch to desktop for real-world practiceContinue from where you are using one of the options below