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Apprendre String Slicing and Indexing | Section 2
Python - Music

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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)
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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:

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

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)
copy
Tâche

Swipe to start coding

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. Chapitre 1
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book
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)
copy

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:

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

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)
copy

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)
copy
Tâche

Swipe to start coding

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

Switch to desktopPassez à un bureau pour une pratique réelleContinuez d'où vous êtes en utilisant l'une des options ci-dessous
Tout était clair ?

Comment pouvons-nous l'améliorer ?

Merci pour vos commentaires !

close

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Completion rate improved to 5.56

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