code: def create_index(self, columns, table_name, if_not_exists = True, unique = False, **kwargs):
      'Create a unique index on the column(s) passed.'
      index_name = simplify(table_name) + u'_' + u'_'.join(map(simplify, columns))
      if unique:
        sql = u'CREATE UNIQUE INDEX %s ON %s (%s)'
      else:
        sql = u'CREATE INDEX %s ON %s (%s)'
  
      first_param = u'IF NOT EXISTS ' + index_name if if_not_exists else index_name
  
      params = (first_param, quote(table_name), ','.join(map(quote, columns)))
      self.execute(sql % params, **kwargsf create_index(self, columns, table_name, if_not_exists = True, unique = False, **kwargs):
      'Create a unique index on the column(s) passed.'
      index_name = simplify(table_name) + u'_' + u'_'.join(map(simplify, columns))
      if unique:
        sql = u'CREATE UNIQUE INDEX %s ON %s (%s)'
      else:
        sql = u'CREATE INDEX %s ON %s (%s)'
  
      first_param = u'IF NOT EXISTS ' + index_name if if_not_exists else index_name
  
      params = (first_param, quote(table_name), ','.join(map(quote, columns)))
      self.execute(sql % params, **kwargs)
docs: Create a unique index on the column(s) passed.