May 2025
Intermediate to advanced
524 pages
16h 25m
German
Content preview from High Performance Python, 3. Auflage
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Kapitel 5. Iteratoren und Generatoren
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Wenn viele Menschen mit Erfahrung in einer anderen Sprache beginnen, Python zu lernen, sind sie von dem Unterschied in der for Schleifennotation überrascht. Das heißt, anstatt zuschreiben
#Other languagesfor(i=0;i<N;i++){do_work(i);}
werden sie in eine neue Funktion namens range eingeführt:
# Pythonforiinrange(N):do_work(i)
Im Python-Codebeispiel rufen wir eine Funktion range auf, die alle Daten erstellt, die wir für die for Schleife benötigen. Intuitiv betrachtet kann dies ein ziemlich zeitaufwändiger Prozess sein - wenn wir versuchen, eine Schleife über die Zahlen 1 bis 100.000.000 zu erstellen, müssen wir viel Zeit darauf verwenden, das Array zu erstellen! An dieser Stelle kommen die Generatoren ins Spiel: Sie ermöglichen es uns, diese Art von Funktionen einfach auszuwerten, sodass wir den Code dieser speziellen Funktionen lesen können, ohne dass die Leistung darunter leidet.
Hinweis
Technisch gesehen ist range ein speziellerBereichstyp und kein Generator. Dennoch ist er nützlich, um die "faule ...
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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.