May 2026
Intermediate
418 pages
10h 50m
Italian
Content preview from Python per Excel (Italian Edition), 2nd Edition
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Capitolo 11. Funzionipersonalizzate
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I tre capitoli precedenti di ti hanno mostrato come automatizzare Excel con uno script Python e come eseguire tale script da Excel con un semplice clic. Questo capitolo introduce le funzioni personalizzate per richiamare il codice Python da Excel.
Funzioni definite dall'utente (UDF)
In passato Microsoft chiamava le funzioni personalizzate di "funzioni definite dall'utente " o UDF. Anche se i termini sono intercambiabili, in questo libro si usa sempre " funzioni personalizzate", che è anche la terminologia usata da Google Sheets.
Le funzioni personalizzate sono funzioni Python che si utilizzano nelle celle di Excel allo stesso modo in cui si utilizzano le funzioni integrate come SUM o AVERAGE. Come nel capitolo precedente, inizieremo con il comando quickstart che ci permette di provare una prima funzione personalizzata in pochissimo tempo. Poi, impareremo come lavorare con i DataFrame e i grafici di pandas, oltre a come eseguire il debug delle funzioni personalizzate. Per concludere questo capitolo, approfondiremo l'ottimizzazione delle prestazioni. Le funzioni personalizzate con la versione locale di
xlwings — come illustrato in questo capitolo — funzionano solo su Windows. Tuttavia, xlwings Lite supporta le funzioni personalizzate su tutte le piattaforme, come vedremo nel Capitolo 13.
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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.