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Name: Praktische Anwendung von Metaklassen
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Author(s):	Mirko Dziadzka
Location	Saal 1B
Date	oct Tue 30	Days Raw Files
Start	13:30	First Raw Start	13:29
Duration	00:30.0:00	Offset	0:00:55
End	14:00	Last Raw End	14:42
Chapters	00:00 0:16:20 0:21:56 0:22:59
Total cuts_time	24 min.

https://2012.de.pycon.org/programm/schedule/sessions/30/
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Description:	Metaklassen (metaclasses) in Python werden oft als exotische Spracheigenschaft betrachtet. Der Vortrag zeigt anhand konkreter Beispiele, wie sich Metaklassen in realen Projekten zum Debuggen und zum Code vereinfachen einsetzen lassen. # Praktische Anwendungen von Metaklassen Python besitzt mit den Metaklassen ein sehr mächtiges Werkzeug, um orthogonale Eigenschaften eines Programms zu Implementieren. Das Stichwort dazu lautet "aspektorientiertes Programmieren". Leider werden Metaklassen aber oft als komplex und schwierig angesehen. Der Vortrag zeigt an einem konkreten Beispiel, wie sich durch die Verwendung von Metaklassen Programmentwicklung vereinfachen kann. Konkret wird die Implementation eines einfachen Debug- und Trace Frameworks vorgestellt. Dieses erlaubt das nachträgliche instrumentieren von Klassen-Methoden, um eine selektive Ablaufverfolgung von Methodenaufrufen auf Objekten ermöglicht. Dies wird erreicht, ohne das diese Debug Aufrufe im normalen Quellcode erscheinen oder bei nicht Benutzung Performance Auswirkungen haben. markdown
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Der Vortrag zeigt anhand konkreter Beispiele, wie sich Metaklassen in realen Projekten zum Debuggen und zum Code vereinfachen einsetzen lassen.</ns2:description><ns2:title type="plain">Praktische Anwendung von Metaklassen</ns2:title><ns3:duration seconds="0" /><ns2:content duration="0" expression="full" isDefault="true" medium="video" type="application/x-shockwave-flash" url="https://www.youtube.com/v/BCogygQS4qk?version=3&f=user_uploads&c=cfkarsten&d=Aarb2r5skm2_yNTuKEinXdAO88HsQjpE1a8d1GxQnGDm&app=youtube_gdata" ns3:format="5" /><ns2:thumbnail height="360" time="00:00:00" url="http://i.ytimg.com/vi/BCogygQS4qk/0.jpg" width="480" /><ns2:thumbnail height="90" time="00:00:00" url="http://i.ytimg.com/vi/BCogygQS4qk/1.jpg" width="120" /><ns2:thumbnail height="90" time="00:00:00" url="http://i.ytimg.com/vi/BCogygQS4qk/2.jpg" width="120" /><ns2:thumbnail height="90" time="00:00:00" url="http://i.ytimg.com/vi/BCogygQS4qk/3.jpg" width="120" /><ns2:category label="Education" scheme="http://gdata.youtube.com/schemas/2007/categories.cat">Education</ns2:category><ns2:category scheme="http://gdata.youtube.com/schemas/2007/developertags.cat">pyconde</ns2:category><ns2:category scheme="http://gdata.youtube.com/schemas/2007/developertags.cat">pyconde2012</ns2:category><ns2:category scheme="http://gdata.youtube.com/schemas/2007/developertags.cat">MirkoDziadzka</ns2:category><ns2:player url="https://www.youtube.com/watch?v=BCogygQS4qk&feature=youtube_gdata_player" /></ns2:group><ns0:title type="text">Praktische Anwendung von Metaklassen</ns0:title><ns4:control><ns4:draft>yes</ns4:draft><ns3:state name="processing" /></ns4:control><ns0:link href="https://www.youtube.com/watch?v=BCogygQS4qk&feature=youtube_gdata" rel="alternate" type="text/html" /><ns0:link href="https://gdata.youtube.com/feeds/api/videos/BCogygQS4qk/responses?client=cfkarsten" rel="http://gdata.youtube.com/schemas/2007#video.responses" type="application/atom+xml" /><ns0:link href="https://gdata.youtube.com/feeds/api/videos/BCogygQS4qk/ratings?client=cfkarsten" rel="http://gdata.youtube.com/schemas/2007#video.ratings" type="application/atom+xml" /><ns0:link href="https://gdata.youtube.com/feeds/api/videos/BCogygQS4qk/complaints?client=cfkarsten" rel="http://gdata.youtube.com/schemas/2007#video.complaints" type="application/atom+xml" /><ns0:link href="https://gdata.youtube.com/feeds/api/videos/BCogygQS4qk/related?client=cfkarsten" rel="http://gdata.youtube.com/schemas/2007#video.related" type="application/atom+xml" /><ns0:link href="https://gdata.youtube.com/feeds/api/users/pyconde/uploads/BCogygQS4qk?client=cfkarsten" rel="self" type="application/atom+xml" /><ns0:link href="https://gdata.youtube.com/feeds/api/users/pyconde/uploads/BCogygQS4qk?client=cfkarsten" rel="edit" type="application/atom+xml" /></ns0:entry> remove: https://www.youtube.com/watch?v=BCogygQS4qk <?xml version='1.0' encoding='UTF-8'?> <ns0:entry xmlns:ns0="http://www.w3.org/2005/Atom" xmlns:ns1="http://schemas.google.com/g/2005" xmlns:ns2="http://search.yahoo.com/mrss/" xmlns:ns3="http://gdata.youtube.com/schemas/2007" xmlns:ns4="http://purl.org/atom/app#"><ns0:category scheme="http://schemas.google.com/g/2005#kind" term="http://gdata.youtube.com/schemas/2007#video" /><ns0:category label="Education" scheme="http://gdata.youtube.com/schemas/2007/categories.cat" term="Education" /><ns0:category scheme="http://gdata.youtube.com/schemas/2007/keywords.cat" term="pyconde" /><ns0:category scheme="http://gdata.youtube.com/schemas/2007/keywords.cat" term="pyconde2012" /><ns0:category scheme="http://gdata.youtube.com/schemas/2007/keywords.cat" term="MirkoDziadzka" /><ns0:id>http://gdata.youtube.com/feeds/api/videos/-dU-O8ksYDM</ns0:id><ns0:author><ns0:name>PyConDE</ns0:name><ns0:uri>https://gdata.youtube.com/feeds/api/users/PyConDE</ns0:uri></ns0:author><ns0:content type="text">Mirko Dziadzka Metaklassen (metaclasses) in Python werden oft als exotische Spracheigenschaft betrachtet. Der Vortrag zeigt anhand konkreter Beispiele, wie sich Metaklassen in realen Projekten zum Debuggen und zum Code vereinfachen einsetzen lassen.</ns0:content><ns0:updated>2012-11-04T15:04:09.000Z</ns0:updated><ns0:published>2012-11-04T15:04:09.000Z</ns0:published><ns1:comments><ns1:feedLink countHint="0" href="https://gdata.youtube.com/feeds/api/videos/-dU-O8ksYDM/comments?client=cfkarsten" rel="http://gdata.youtube.com/schemas/2007#comments" /></ns1:comments><ns2:group><ns2:keywords>pyconde, pyconde2012, MirkoDziadzka</ns2:keywords><ns2:description type="plain">Mirko Dziadzka Metaklassen (metaclasses) in Python werden oft als exotische Spracheigenschaft betrachtet. Der Vortrag zeigt anhand konkreter Beispiele, wie sich Metaklassen in realen Projekten zum Debuggen und zum Code vereinfachen einsetzen lassen.</ns2:description><ns2:title type="plain">Praktische Anwendung von Metaklassen</ns2:title><ns3:duration seconds="0" /><ns2:content duration="0" expression="full" isDefault="true" medium="video" type="application/x-shockwave-flash" url="https://www.youtube.com/v/-dU-O8ksYDM?version=3&f=user_uploads&c=cfkarsten&d=Aarb2r5skm2_yNTuKEinXdAO88HsQjpE1a8d1GxQnGDm&app=youtube_gdata" ns3:format="5" /><ns2:thumbnail height="360" time="00:00:00" url="http://i.ytimg.com/vi/-dU-O8ksYDM/0.jpg" width="480" /><ns2:thumbnail height="90" time="00:00:00" url="http://i.ytimg.com/vi/-dU-O8ksYDM/1.jpg" width="120" /><ns2:thumbnail height="90" time="00:00:00" url="http://i.ytimg.com/vi/-dU-O8ksYDM/2.jpg" width="120" /><ns2:thumbnail height="90" time="00:00:00" url="http://i.ytimg.com/vi/-dU-O8ksYDM/3.jpg" width="120" /><ns2:category label="Education" scheme="http://gdata.youtube.com/schemas/2007/categories.cat">Education</ns2:category><ns2:category scheme="http://gdata.youtube.com/schemas/2007/developertags.cat">pyconde</ns2:category><ns2:category scheme="http://gdata.youtube.com/schemas/2007/developertags.cat">pyconde2012</ns2:category><ns2:category scheme="http://gdata.youtube.com/schemas/2007/developertags.cat">MirkoDziadzka</ns2:category><ns2:player url="https://www.youtube.com/watch?v=-dU-O8ksYDM&feature=youtube_gdata_player" /></ns2:group><ns0:title type="text">Praktische Anwendung von Metaklassen</ns0:title><ns4:control><ns4:draft>yes</ns4:draft><ns3:state name="processing" /></ns4:control><ns0:link href="https://www.youtube.com/watch?v=-dU-O8ksYDM&feature=youtube_gdata" rel="alternate" type="text/html" /><ns0:link href="https://gdata.youtube.com/feeds/api/videos/-dU-O8ksYDM/responses?client=cfkarsten" rel="http://gdata.youtube.com/schemas/2007#video.responses" type="application/atom+xml" /><ns0:link href="https://gdata.youtube.com/feeds/api/videos/-dU-O8ksYDM/ratings?client=cfkarsten" rel="http://gdata.youtube.com/schemas/2007#video.ratings" type="application/atom+xml" /><ns0:link href="https://gdata.youtube.com/feeds/api/videos/-dU-O8ksYDM/complaints?client=cfkarsten" rel="http://gdata.youtube.com/schemas/2007#video.complaints" type="application/atom+xml" /><ns0:link href="https://gdata.youtube.com/feeds/api/videos/-dU-O8ksYDM/related?client=cfkarsten" rel="http://gdata.youtube.com/schemas/2007#video.related" type="application/atom+xml" /><ns0:link href="https://gdata.youtube.com/feeds/api/users/pyconde/uploads/-dU-O8ksYDM?client=cfkarsten" rel="self" type="application/atom+xml" /><ns0:link href="https://gdata.youtube.com/feeds/api/users/pyconde/uploads/-dU-O8ksYDM?client=cfkarsten" rel="edit" type="application/atom+xml" /></ns0:entry> production notes

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