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object --+    
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LookupBase --+
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            LenientLookup
Default variable lookup mechanism for expressions.
When an undefined variable is referenced using this lookup style, the reference evaluates to an instance of the Undefined class:
>>> expr = Expression('nothing', lookup='lenient') >>> undef = expr.evaluate({}) >>> undef <Undefined 'nothing'>
The same will happen when a non-existing attribute or item is accessed on an existing object:
>>> expr = Expression('something.nil', lookup='lenient') >>> expr.evaluate({'something': dict()}) <Undefined 'nil'>
See the documentation of the Undefined class for details on the behavior of such objects.
See Also: StrictLookup
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