Return avatar implementing one of the given interfaces.
Parameters | avatarId | a string that identifies an avatar, as returned by ICredentialsChecker.requestAvatarId
(via a Deferred). Alternatively, it may be
twisted.cred.checkers.ANONYMOUS .
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| mind | usually None. See the description of mind in Portal.login .
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| interfaces | the interface(s) the returned avatar should implement, e.g.
IMailAccount . See the description of Portal.login .
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Returns | a deferred which will fire a tuple of (interface, avatarAspect,
logout), or the tuple itself. The interface will be one of the interfaces
passed in the 'interfaces' argument. The 'avatarAspect' will implement
that interface. The 'logout' object is a callable which will detach the
mind from the avatar.
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