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 "$").
- Overrides:
InterpolationEngine._parse_match
- (inherited documentation)
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