human
Solve the following python programming problem given the following code:
def __init__(self, connection_string, echo) : 
    self.engine = create_engine (connection_string, encoding = 'utf-8', echo = echo, pool_recycle = 3600, pool_size = 20) 
    self.psql_test_engine = create_engine (connection_string, encoding = 'utf-8', echo = echo, pool_recycle = 3600, connect_args = { 
        'connect_timeout' : 1, 
}) 
    self.ms_test_engine = create_engine (connection_string, encoding = 'utf-8', echo = echo, pool_recycle = 3600, connect_args = { 
        'timeout' : 1, 
}) 
    self.my_test_engine = create_engine (connection_string, encoding = 'utf-8', echo = echo, pool_recycle = 3600, connect_args = { 
        'connect_timeout' : 1, 
}) 
    "
        # Removing pool_timeout and max_overflow allowed the tests to pass
        self.engine = create_engine(connection_string, encoding='utf-8', echo=echo, pool_recycle=3600,
                                    pool_timeout=5, pool_size=20, max_overflow=0)
        self.psql_test_engine = create_engine(connection_string, encoding='utf-8', echo=echo, pool_recycle=3600,
                                              pool_timeout=5, max_overflow=0, connect_args={'connect_timeout': 1})
        self.ms_test_engine = create_engine(connection_string, encoding='utf-8', echo=echo, pool_recycle=3600,
                                            pool_timeout=5, max_overflow=0, connect_args={'timeout': 1})
        self.my_test_engine = create_engine(connection_string, encoding='utf-8', echo=echo, pool_recycle=3600,
                                            pool_timeout=5, max_overflow=0, connect_args={'connect_timeout': 1})
        " 
    '
        # Old code
        class SessionFactory():
            def __init__(self, connection_string, echo):
                self.engine = create_engine(connection_string, encoding=\'utf-8\', echo=echo,
                                            #pool_size=20,
                                            pool_recycle=3600)

                # Create session maker
                self.Session =...

    
    

    Fix the buggy line: self.psql_test_Session = sessionmaker (bind = echo.psql_test_engine)
assistant
#Here is Python code to fix the buggy line: self.

self.psql_test_Session = sessionmaker (bind = self.psql_test_engine)