class_docstr: Abstract base class for objects that can be used to compose an SQL string.
  
  `!Composable` objects can be passed directly to `~cursor.execute()`,
  `~cursor.executemany()`, `~cursor.copy_expert()` in place of the query
  string.
  
  `!Composable` objects can be joined using the ``+`` operator: the result
  will be a `Composed` instance containing the objects joined. The operator
  ``*`` is also supported with an integer argument: the result is a
  `!Composed` instance containing the left argument repeated as many times as
  requested.
code: def __repr__(self):
      return f"{self.__class__.__name__}({self._wrapped!r})"
  
imports: import string
  from psycopg2 import extensions
label_desc: Use image node_id 2 for calling the Composable obj's underlying member method code with example usage: obj.__repr__() and returns: self, str, self, str