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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_wsgi_app(self, name=None, defaults=None):
 """ Reads the configuration source and finds and loads a WSGI application defined by the entry with name ``name`` per the PasteDeploy configuration format and loading mechanism. :param name: The named WSGI app to find, load and return. Defaults to ``None`` which becomes ``main`` inside :func:`paste.deploy.loadapp`. :param defaults: The ``global_conf`` that will be used during app instantiation. :return: A WSGI application. """

        name = self._maybe_get_default_name(name)
        defaults = self._get_defaults(defaults)
        return loadapp(
            self.pastedeploy_spec,
            name=name,
            relative_to=self.relative_to,
            global_conf=defaults,
        )