March 2025
Intermediate to advanced
504 pages
12h 5m
Italian
Content preview from Python Polars: la guida definitiva
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Capitolo 6. Lettura e scrittura dei dati
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Ora che hai visto alcuni concetti essenziali, come i tipi di dati e le diverse API, sei pronto per imparare a lavorare con le fonti di dati esterne. Questo include la lettura di dati da file e database in Polars. Inoltre, parleremo di come scrivere i tuoi risultati su file e database. Alla fine di questo capitolo, sarai in grado di iniziare a lavorare con i tuoi dati. Ti invitiamo a iniziare a usare i tuoi dati il prima possibile, perché questo renderà l'apprendimento di Polars non solo più piacevole ma anche più efficace.
I dati esterni possono arrivare in tutti i modi e da tutti i luoghi. Per questo motivo, Polars ha più di 30 funzioni relative alla lettura dei dati e queste funzioni accettano molti argomenti. Sarebbe difficile e, soprattutto, estremamente noioso trattare tutte le funzioni e tutti gli argomenti in questo capitolo. Per questo c'è la documentazione ufficiale delle API. Daremo una rapida panoramica dei formati supportati da Polars, insieme ai relativi metodi per lavorarci. Nel resto del capitolo ci concentreremo sui formati e sulle situazioni che è più probabile incontrare.
In questo capitolo imparerai a..:
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Leggi e scrivi dati in molti formati, tra cui CSV, Excel e Parquet.
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Gestisci più file in modo efficiente usando il globbing
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Leggere correttamente i valori mancanti
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Gestione ...
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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.