March 2025
Intermediate to advanced
504 pages
12h 5m
Italian
Content preview from Python Polars: la guida definitiva
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Capitolo 11. Filtrare e ordinare le righe
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Mentre il capitolo precedente riguardava le colonne, questo capitolo è dedicato alle righe di un DataFrame.1 Analizzeremo principalmente due tipi di operazioni che puoi eseguire sulle righe:
-
Filtrare le righe utilizzando il metodo
df.filter() -
Ordinare le righe con il metodo
df.sort()
Con il filtraggio si seleziona un sottoinsieme di righe in base ai loro valori, mentre con l'ordinamento si riordinano le righe in base ai loro valori; il numero di righe rimane invariato. Oltre a questo, parleremo di vari altri metodi correlati al filtraggio e all'ordinamento.
Lavorerai con un piccolo DataFrame sugli elettroutensili che si trovano di solito nel garage di un falegname amatoriale. Per ogni utensile abbiamo il tipo, il codice prodotto, la marca, il prezzo, i giri al minuto (RPM) e se è a batteria o meno. Ecco come si presenta il DataFrame di tools:
tools=pl.read_csv("data/tools.csv")tools
shape: (10, 6) ┌───────────────────────┬──────────────┬────────┬──────────┬───────┬───────┐ │ tool │ product │ brand │ cordless │ price │ rpm │ │ --- │ --- │ --- │ --- │ --- │ --- │ │ str │ str │ str │ bool │ i64 │ i64 │ ╞═══════════════════════╪══════════════╪════════╪══════════╪═══════╪═══════╡ │ Rotary Hammer │ HR2230 │ Makita │ false │ 199 │ 1050 │ │ Miter Saw │ GCM 8 SJL │ Bosch │ false │ 391 │ 5500 │ │ ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.