使用psycopg2扩展名ISOLATION_LEVEL_AUTOCOMMIT：
发出命令且不需要commit（）或rollback（）时，不会启动任何事务。
import psycopg2
from psycopg2 import sql
from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT # <-- ADD THIS LINE
con = psycopg2.connect(dbname='postgres',
user=self.user_name, host='',
password=self.password)
con.set_isolation_level(ISOLATION_LEVEL_AUTOCOMMIT) # <-- ADD THIS LINE
cur = con.cursor()
# Use the psycopg2.sql module instead of string concatenation
# in order to avoid sql injection attacs.
cur.execute(sql.sql("CREATE DATABASE {}").format(
sql.Identifier(self.db_name))
)
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