Re: [Sqlalchemy-tickets] [sqlalchemy] #2720: new C extensions for attribute accessing

[sqlalchemy <mi...@zz...>]

#2720: new C extensions for attribute accessing
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      Reporter:  zzzeek            |      Owner:  zzzeek
          Type:  enhancement       |     Status:  new
      Priority:  medium            |  Milestone:  0.9.0
     Component:  cextensions       |   Severity:  very major - up to 2 days
    Resolution:                    |   Keywords:
Progress State:  not decided upon  |
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Comment (by claudiofreire):

 No, it's not that at all. What it's doing, is try to get the __dict__, for
 comparison against the instance_dict() return value. Caching (which is
 what accelerates things) is only enabled when:

 {{{instance_dict(instance) is instance.__dict__}}}

 and

 {{{self.impl.get(instance_state(instance), dict_)}}} is successful (ie: no
 errors).

 If both happen, then from that point onwards, all attribute accesses of
 that kind (ie: {{{Entity.id}}} for all instances of Entity) will shortcut
 directly towards {{{instance.__dict__[self.key]}}}, as long as
 {{{globals()['instance_dict']}}} hasn't changed.

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Ticket URL: <http://www.sqlalchemy.org/trac/ticket/2720#comment:13>
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