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New warnings to the uninitiated reader.
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Demo/metaclasses/index.html

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<H1>Metaclasses in Python 1.5</H1>
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<H2>(A.k.a. The Killer Joke :-)</H2>
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<P><b>Note: this document describes a feature only released in Python
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1.5 (starting with 1.5a3).</b>
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<HR>
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(<i>Postscript:</i> reading this essay is probably not the best way to
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understand the metaclass hook described here. See a <A
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HREF="meta-vladimir.txt">message posted by Vladimir Marangozov</A>
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which may give a gentler introduction to the matter. You may also
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want to search Deja News for messages with "metaclass" in the subject
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posted to comp.lang.python in July and August 1998.)
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<HR>
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<P>In previous Python releases (and still in 1.5), there is something
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called the ``Don Beaudry hook'', after its inventor and champion.
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<P>(On first reading, you may want to skip directly to the examples in
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the section "Writing Metaclasses in Python" below, unless you want
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your head to explode.) (XXX I should really restructure this document
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to place the historic notes last. After 1.5a4 is released...)
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your head to explode.)
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<P>
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