August 2007
Beginner to intermediate
656 pages
17h 20m
German
Content preview from Einfüehrung in PythonBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Vergleiche und Gleichheit
Alle Python-Objekte reagieren auf Vergleiche: Test auf Gleichheit, relative Größe usw. Python-Vergleiche prüfen immer alle Teile von zusammengesetzten Objekten, bis ein Ergebnis festgestellt werden kann. Tatsächlich traversiert Python verschachtelte Objekte automatisch und wendet Vergleiche rekursiv an, von links nach rechts und so tief wie nötig.
Ein Vergleich von Listen-Objekten z.B. vergleicht automatisch alle Komponenten darin:
>>>L1 = [1, ('a', 3)] # Gleicher Wert, eigenständige Objekte>>>L2 = [1, ('a', 3)]>>>L1 == L2, L1 is L2 # Äquivalent? Gleiches Objekt?(True, False)
Hier wurden an L1 und L2 zwei äquivalente Listen zugewiesen, die aber verschiedene Objekte sind. Auf Grund der Art der Python-Verweise (siehe ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.