September 2009
Intermediate to advanced
464 pages
17h 19m
German
Content preview from Python für Kids
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326
Wörterbücher, Dateien und der alte Cäsar
Kapitel
12
kommst du dann drauf, dass Python dafür eine noch elegantere Lösung
parat hat. So ist das auch mit dem Umkehren von Dictionaries:
>
Mach mit:
>>> cc = {"a":"g", "b":"h", "c":"i", "d":"j"}
>>> dc = {wert : schluessel for (schluessel, wert) in
cc.items()}
>>> dc
{'i': 'c', 'h': 'b', 'j': 'd', 'g': 'a'}
Dictionary Comprehension nennt sich das. Ist ganz so gebaut wie List
Comprehensions. In Python ist es nämlich so wie im richtigen Leben: Du
lernst nie aus.
Dateien
Computer-Praktiker, die mit Python arbeiten, müssen verschiedenartigste
Textdateien bearbeiten. Bearbeitet werden können diese ...
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