如何導入別名SQLAlchemy的功能

Question

在the SQLAlchemy Tutorial

一個例子使用aliased：

>>> from sqlalchemy import func 
>>> ua = aliased(User) 
>>> q = q.from_self(User.id, User.name, ua.name).\ 
...  filter(User.name < ua.name).\ 
...  filter(func.length(ua.name) != func.length(User.name)) 

但它不能在0.6.1工作：

>>> from sqlalchemy import func 

>>> ua = aliased(User) 


Traceback (most recent call last): 
    File "<pyshell#3>", line 1, in <module> 
    ua = aliased(User) 
NameError: name 'aliased' is not defined 
>>> ua = aliased(User) 


Traceback (most recent call last): 
    File "<pyshell#4>", line 1, in <module> 
    ua = aliased(User) 
NameError: name 'aliased' is not defined 
>>> ua = sqlalchemy.aliased(User) 

Traceback (most recent call last): 
    File "<pyshell#5>", line 1, in <module> 
    ua = sqlalchemy.aliased(User) 
NameError: name 'sqlalchemy' is not defined 
>>> import sqlalchemy 
>>> ua = sqlalchemy.aliased(User) 

Traceback (most recent call last): 
    File "<pyshell#7>", line 1, in <module> 
    ua = sqlalchemy.aliased(User) 
AttributeError: 'module' object has no attribute 'aliased' 
>>> 

Answer 1

地址：

from sqlalchemy.orm import aliased 

class sqlalchemy.orm.aliased