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