python3 下没办法运行sqlalchemy ？

wolong

　　[root@localhost python]# python3 router.py
　　Traceback (most recent call last):
　　File "/usr/local/lib/python3.6/site-packages/sqlalchemy/dialects/sqlite/pysqlite.py", line 337, in dbapi
　　from sqlite3 import dbapi2 as sqlite  # try 2.5+ stdlib name.
　　File "/usr/local/lib/python3.6/sqlite3/__init__.py", line 23, in <module>
　　from sqlite3.dbapi2 import *
　　File "/usr/local/lib/python3.6/sqlite3/dbapi2.py", line 27, in <module>
　　from _sqlite3 import *
　　ModuleNotFoundError: No module named '_sqlite3'
　　During handling of the above exception, another exception occurred:
　　Traceback (most recent call last):
　　File "router.py", line 2, in <module>
　　from db import *
　　File "/home/ming/python/db.py", line 11, in <module>
　　db_engine = create_engine('sqlite:///:memory:', echo = False)
　　File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/__init__.py", line 391, in create_engine
　　return strategy.create(*args, **kwargs)
　　File "/usr/local/lib/python3.6/site-packages/sqlalchemy/engine/strategies.py", line 80, in create
　　dbapi = dialect_cls.dbapi(**dbapi_args)
　　File "/usr/local/lib/python3.6/site-packages/sqlalchemy/dialects/sqlite/pysqlite.py", line 339, in dbapi
　　raise e
　　File "/usr/local/lib/python3.6/site-packages/sqlalchemy/dialects/sqlite/pysqlite.py", line 334, in dbapi
　　from pysqlite2 import dbapi2 as sqlite
　　ModuleNotFoundError: No module named 'pysqlite2'
　　[root@localhost python]#