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11.6. TaxonPhotoSet.nForms(): Number of contained forms

This method returns the number of forms referred to self. Since the dictionary self._formMap has one entry for each referred form, we need only return the cardinality of that dictionary.

# - - -   T a x o n P h o t o S e t . n F o r m s

    def nForms(self):
        '''How many form names are referred to self?
        return  len(self._formMap)