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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 getAnalysisRequests(self):
 """ Return all the Analysis Request brains linked to the Sampling Round """

        # I have to get the catalog in this way because I can't do it with 'self'...
        pc = getToolByName(api.portal.get(), 'portal_catalog')
        contentFilter = {'portal_type': 'AnalysisRequest',
                         'is_active': True,
                         'SamplingRoundUID': self.UID()}
        return pc(contentFilter)