title: issue with %s with sqlalchemy core and sqlite
body: <p>When I try to use the %s syntax with sqlalchemy and sqlite I get an error. The same syntax with postgresql works fine:</p>
  
  <pre><code>import sqlalchemy
  e = sqlalchemy.create_engine('sqlite:////tmp/x.db?timeout=120000')
  e.execute('select * from people where name = %s;', 'joe').fetchall()
  </code></pre>
  
  <p>I get this:</p>
  
  <pre><code>Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/sqlalchemy/engine/base.py", line 1396, in _cursor_execute
      context)
    File "/usr/lib/python3/dist-packages/sqlalchemy/engine/default.py", line 301, in do_execute
      cursor.execute(statement, parameters)
  sqlite3.OperationalError: near "%": syntax error
  
  The above exception was the direct cause of the following exception:
  
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
    File "/usr/lib/python3/dist-packages/sqlalchemy/engine/base.py", line 1790, in execute
      return connection.execute(statement, *multiparams, **params)
    File "/usr/lib/python3/dist-packages/sqlalchemy/engine/base.py", line 1191, in execute
      params)
    File "/usr/lib/python3/dist-packages/sqlalchemy/engine/base.py", line 1287, in _execute_text
      return self.__execute_context(context)
    File "/usr/lib/python3/dist-packages/sqlalchemy/engine/base.py", line 1302, in __execute_context
      context.parameters[0], context=context)
    File "/usr/lib/python3/dist-packages/sqlalchemy/engine/base.py", line 1403, in _cursor_execute
      context)
    File "/usr/lib/python3/dist-packages/sqlalchemy/engine/base.py", line 1360, in _handle_dbapi_exception
      from e
  sqlalchemy.exc.OperationalError: (OperationalError) near "%": syntax error 'select * from people where name = %s;' ('joe',)
  &gt;&gt;&gt; 
  </code></pre>
  
  <p>Again, the exact same thing with postgres returns a list or rows.
  Is this a bug?
  Or is it expected?</p>