Package genshi :: Package template :: Module eval :: Class StrictLookup

Class StrictLookup

object --+    
LookupBase --+

Strict variable lookup mechanism for expressions.

Referencing an undefined variable using this lookup style will immediately raise an UndefinedError:

>>> expr = Expression('nothing', lookup='strict')
>>> expr.evaluate({})
Traceback (most recent call last):
UndefinedError: "nothing" not defined

The same happens when a non-existing attribute or item is accessed on an existing object:

>>> expr = Expression('something.nil', lookup='strict')
>>> expr.evaluate({'something': dict()})
Traceback (most recent call last):
UndefinedError: {} has no member named "nil"
Instance Methods

Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __init__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__

Class Methods
undefined(cls, key, owner=UNDEFINED)
Raise an UndefinedError immediately.

Inherited from LookupBase: globals, lookup_attr, lookup_item, lookup_name


Inherited from object: __class__

Method Details

undefined(cls, key, owner=UNDEFINED)
Class Method

Raise an UndefinedError immediately.
  • key - the name of the variable
  • owner - the owning object, if the variable is accessed as a member
Overrides: LookupBase.undefined