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The discovery heuristic considers L{MethodicalMachine} instances
that are module-level attributes or class-level attributes
accessible from module scope. Machines inside nested classes will
be discovered, but those returned from functions or methods will not be.
@type within: L{PythonModule} or L{twisted.python.modules.PythonAttribute}
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under the a Python object specified by an FQPN.
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that are module-level attributes or class-level attributes
accessible from module scope. Machines inside nested classes will
be discovered, but those returned from functions or methods will not be.
@type within: an FQPN
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@return: a generator which yields FQPN, L{MethodicalMachine} pairs.
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