code: def explode(self):
          
          # Manage higher realms where defined
          for realm in [tmp_realm for tmp_realm in self if tmp_realm.higher_realms]:
              for parent in realm.higher_realms:
                  higher_realm = self.find_by_name(parent)
                  if higher_realm:
                      # Add the realm to its parent realm members
                      higher_realm.realm_members.append(realm.get_name())
  
          for realm in self:
              # Set a recursion tag to protect against loop
              for tmp_realm in self:
                  tmp_realm.rec_tag = False
              realm.get_realms_by_explosion(self)
  
          # Clean the recursion tag
          for tmp_realm in self:
              del tmp_realm.rec_tag
docs: Explode realms with each realm_members and higher_realms to get all the
          realms sub realms.
  
          :return: None