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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 exposure_notes(self):
 """Get the exposure specific notes defined in definitions. This method will do a lookup in definitions and return the exposure definition specific notes dictionary. This is a helper function to make it easy to get exposure specific notes from the definitions metadata. .. versionadded:: 3.5 :returns: A list like e.g. safe.definitions.exposure_land_cover[ 'notes'] :rtype: list, None """

        notes = []
        exposure = definition(self.exposure.keywords.get('exposure'))
        if 'notes' in exposure:
            notes += exposure['notes']
        if self.exposure.keywords['layer_mode'] == 'classified':
            if 'classified_notes' in exposure:
                notes += exposure['classified_notes']
        if self.exposure.keywords['layer_mode'] == 'continuous':
            if 'continuous_notes' in exposure:
                notes += exposure['continuous_notes']
        return notes