April 2025
Intermediate to advanced
166 pages
4h 17m
Italian
Content preview from Usare Asyncio in Python
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Python 3.4 ha introdotto la libreria asyncio e Python 3.5 ha creato le parole chiave async e await per utilizzarla in modo piacevole. Queste nuove aggiunte consentono la cosiddetta programmazione asincrona .
Tutte queste nuove funzionalità, a cui mi riferirò con l'unico nome diAsyncio, sono state accolte dalla comunità di Python con una certa diffidenza; un segmento della comunità sembra vederle come complesse e difficili da capire. Questa opinione non è limitata ai principianti: diversi collaboratori di alto profilo della comunità Python hanno espresso dubbi sulla complessità dell'API Asyncio in Python e gli educatori della comunità hanno espresso preoccupazione su come insegnare Asyncio agli studenti.
La maggior parte delle persone con qualche anno di esperienza con Python ha già utilizzato i thread e, anche se non lo hai fatto, è probabile che tu abbia sperimentato il blocco. Ad esempio, se hai scritto dei programmi utilizzando la meravigliosa libreria requests, avrai sicuramente notato che il tuo programma si ferma per un po' mentre esegue requests.get(url); questo è un comportamento di blocco.
Per compiti una tantum, questo va bene; ma se vuoi recuperare diecimila URL contemporaneamente, sarà difficile usarerequests. La concorrenza su larga scala è una delle ragioni principali per imparare e utilizzare Asyncio, ma l'altra grande ...
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