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Generating class definitions at runtime in memory from XSD or JSON

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  Generating class definitions at runtime in memory from XSD or JSON Stodge <stodge@gmail.com> - 2012-02-16 17:15 -0800
    Re: Generating class definitions at runtime in memory from XSD or JSON Nobody <nobody@nowhere.com> - 2012-02-17 10:02 +0000
    Re: Generating class definitions at runtime in memory from XSD or JSON Stefan Behnel <stefan_ml@behnel.de> - 2012-02-17 13:57 +0100

#20531 — Generating class definitions at runtime in memory from XSD or JSON

Does anyone know of a library to generate class definitions in memory,
at runtime, from XSD or JSON? I know about PyXB, generateDS and some
others, but they all rely on generating python source files at the
command line, and then using those to parse XML.

Thanks

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#20545

On Thu, 16 Feb 2012 17:15:59 -0800, Stodge wrote:

> Does anyone know of a library to generate class definitions in memory,
> at runtime, from XSD or JSON? I know about PyXB, generateDS and some
> others, but they all rely on generating python source files at the
> command line, and then using those to parse XML.

You don't need a library to generate classes. If the type() function is
called with 3 arguments, it creates and returns a new class. The first
argument is the name of the class, the second argument a tuple of base
classes, the third argument is the class' dictionary. E.g.:

	class Foo(Bar, Baz):
	    def __init__(self):
	        pass

could be written as:

	def foo_init(self):
	    pass

	Foo = type('Foo', (Bar, Baz), {'__init__': foo_init})

If you want to generate the function bodies from the contents of the
JSON or XML file, use exec().

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#20551

Stodge, 17.02.2012 02:15:
> Does anyone know of a library to generate class definitions in memory,
> at runtime, from XSD or JSON?

The question is: why do you want to do that? There may be other ways to do
what you *actually* want to do, but we don't know what that is.

Stefan

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