title: Why can we "from sqlalchemy import insert" when it is defined in "sql.alchemy.sql.expression"?
body: <p>I recently saw a document on <a href="https://docs.sqlalchemy.org/en/14/core/dml.html#sqlalchemy.sql.expression.insert" rel="nofollow noreferrer">https://docs.sqlalchemy.org/en/14/core/dml.html#sqlalchemy.sql.expression.insert</a>.</p>
  <p>I want to know why <code>insert()</code> is declared under <code>sqlalchemy.sql.expression</code>, and we can still import it by <code>from sqlalchemy import insert</code>.</p>