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(python2.1-ref.info)Attribute references

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Attribute references
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An attribute reference is a primary followed by a period and a name:

     attributeref:   primary "." identifier

The primary must evaluate to an object of a type that supports
attribute references, e.g., a module, list, or an instance.  This
object is then asked to produce the attribute whose name is the
identifier.  If this attribute is not available, the exception
`AttributeError'  is raised.  Otherwise, the type and value of the
object produced is determined by the object.  Multiple evaluations of
the same attribute reference may yield different objects.