code: def from_dict(cls, copula_dict):
          
          instance = cls()
          instance.fitted = copula_dict['fitted']
          instance.constant_value = copula_dict['constant_value']
  
          if instance.fitted and instance.constant_value is None:
              instance.mean = copula_dict['mean']
              instance.std = copula_dict['std']
  
          return instance
docs: Set attributes with provided values.