Download Python 3: das umfassende Handbuch by Ernesti, Johannes; Kaiser, Peter PDF

By Ernesti, Johannes; Kaiser, Peter

ISBN-10: 3836219255

ISBN-13: 9783836219259

[Einstieg, Praxis, Referenz ; Sprachgrundlagen, Objektorientierung, Modularisierung ; Migration, Debugging, Interoperabilität mit C, GUIs, Netzwerkkommunikation u.v.m.]

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Schleifenkörper In der ersten Zeile des Schleifenkörpers wird eine vom Spieler eingegebene Zahl eingelesen und in der Variablen versuch gespeichert. Dabei wird mithilfe von input("Raten Sie: ") die Eingabe des Benutzers eingelesen und mit int in eine ganze Zahl konvertiert (von engl. integer, »ganze Zahl«). Diese Konvertierung ist wichtig, da Benutzereingaben generell als String eingelesen werden. In unserem Fall möchten wir die Eingabe jedoch als ganze Zahl weiterverwenden. Der String "Raten Sie: " wird vor der Eingabe ausgegeben und dient dazu, den Benutzer zur Eingabe der Zahl aufzufordern.

Initialisierung Bei der Initialisierung werden die für das Spiel benötigten Variablen angelegt. Python unterscheidet zwischen verschiedenen Datentypen, wie Zeichenketten, Ganz- oder Fließkommazahlen. Der Typ einer Variablen wird zur Laufzeit des Programms anhand des ihr zugewiesenen Wertes bestimmt. Es ist also nicht nötig, einen Datentyp explizit anzugeben. Eine Variable kann im Laufe des Programms ihren Typ ändern. In unserem Spiel werden Variablen für die gesuchte Zahl (geheimnis), die Benutzereingabe (versuch) und den Versuchszähler (zaehler) angelegt und mit Anfangswerten versehen.

Aus Benutzersicht bedeutet dies: Die Schleife läuft so lange, bis die Benutzereingabe mit der gespeicherten Zahl übereinstimmt. Den zum Schleifenkopf gehörigen Schleifenkörper erkennt man daran, dass die nachfolgenden Zeilen um eine Stufe weiter eingerückt wurden. Sobald die Einrückung wieder um einen Schritt nach links geht, endet der Schleifenkörper. Schleifenkörper In der ersten Zeile des Schleifenkörpers wird eine vom Spieler eingegebene Zahl eingelesen und in der Variablen versuch gespeichert.

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