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String Slicing and Indexing

Indexing is like selecting a specific note from your melody. Each character in a string has a position, starting from 0. So, if you want to find the first character in song_title, you use:


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song_title = "Bohemian Rhapsody"
first_letter = song_title[0]
print("First letter:", first_letter)

Note

Python uses zero-based indexing, so the first character is at position 0, the second at position 1, and so on.

Slicing is like creating a melody by selecting a range of notes. You can extract a substring by specifying a start and end index. For example, if you want to extract "Bohemian" from song_title, you can slice it like this:


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song_title = "Bohemian Rhapsody"
melody = song_title[0:8]
print("Melody:", melody)

The slice 0:8 means "start at index 0 and go up to, but not including, index 8."

Just like a DJ can remix a track, you can use slicing to create new variations. You can even specify a step to skip characters, like skipping every other note:


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song_title = "Bohemian Rhapsody"
remix = song_title[0:8:2]
print("Remix:", remix)

Sometimes, you want to rewind and start from the end of the track. Negative Indexing allows you to do just that. For example, to get the last character:


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song_title = "Bohemian Rhapsody"
last_letter = song_title[-1]
print("Last letter:", last_letter)

Task

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Complete the extract_first_characters function that extracts and returns the first characters_count characters from a given track name. This is useful for creating previews or summaries of track names.

Inputs:

track_name: A string representing the name of the track.
characters_count: An integer specifying the number of characters to extract from the beginning of the track name.

Steps:

Extract Characters: Use string slicing to extract the first characters_count characters from track_name.

Solution

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Section 2. Chapter 1

solution.py

main.py

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String Slicing and Indexing

Indexing is like selecting a specific note from your melody. Each character in a string has a position, starting from 0. So, if you want to find the first character in song_title, you use:


              123
            
song_title = "Bohemian Rhapsody"
first_letter = song_title[0]
print("First letter:", first_letter)

Note

Python uses zero-based indexing, so the first character is at position 0, the second at position 1, and so on.


              123
            
song_title = "Bohemian Rhapsody"
melody = song_title[0:8]
print("Melody:", melody)

The slice 0:8 means "start at index 0 and go up to, but not including, index 8."

Just like a DJ can remix a track, you can use slicing to create new variations. You can even specify a step to skip characters, like skipping every other note:


              123
            
song_title = "Bohemian Rhapsody"
remix = song_title[0:8:2]
print("Remix:", remix)

Sometimes, you want to rewind and start from the end of the track. Negative Indexing allows you to do just that. For example, to get the last character:


              123
            
song_title = "Bohemian Rhapsody"
last_letter = song_title[-1]
print("Last letter:", last_letter)

Task

Swipe to start coding

Inputs:

track_name: A string representing the name of the track.
characters_count: An integer specifying the number of characters to extract from the beginning of the track name.

Steps:

Extract Characters: Use string slicing to extract the first characters_count characters from track_name.

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 2. Chapter 1

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