```Python
async def get_database():
    with Session() as session:
        try:
            yield session
        except HTTPException:
            session.rollback()
            raise
        finally:
            session.close()
```

with a new value specified by an <a href="#Expressions">expression</a>.
An assignment statement may assign a single value to a single variable, or multiple values to a
matching number of variables.
</p>

<pre class="ebnf">
Assignment = ExpressionList assign_op ExpressionList .

assign_op = [ add_op | mul_op ] "=" .
</pre>

<p>