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         object --+    
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InterpolationEngine --+
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                     TemplateInterpolation
Behaves like string.Template.
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| _KEYCRE = re.compile(r' | |||
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 Implementation-dependent helper function. Will be passed a match object corresponding to the interpolation key we just found (e.g., "%(foo)s" or "$foo"). Should look up that key in the appropriate config file section (using the ``_fetch()`` helper function) and return a 3-tuple: (key, value, section) ``key`` is the name of the key we're looking for ``value`` is the value found for that key ``section`` is a reference to the section where it was found ``key`` and ``section`` should be None if no further interpolation should be performed on the resulting value (e.g., if we interpolated "$$" and returned "$"). 
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| _KEYCRE
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