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Decorator module, see http://pypi.python.org/pypi/decorator
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An object with the ability to create functions with a given signature.
It has attributes name, doc, module, signature, defaults, dict and
methods update and make.
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Create a function from the strings name, signature and body.
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decorator(caller) converts a caller function into a decorator;
decorator(caller, func) decorates a function using a caller.
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