在sqlalchemy/cx\u oracle中使用绑定参数创建表失败

from sqlalchemy.sql import text
from sqlalchemy import create_engine

con = create_engine(\\..)
s = text("""create table test_table as select * from dual where 1 = 1 """)
con.execute(s)

但是,如果我使用绑定参数:

s = text("""create table test_table as select * from dual where 1 = :a """)
con.execute(s, a = 1)

它因错误而失败 DatabaseError: (cx_Oracle.DatabaseError) ORA-01036: illegal variable name/number .

s = text("""select * from dual where 1 = :a """)
con.execute(s, a = 1).fetchall()
#[('X',)]