Installing SymbolType (using "easy_install SymbolType" or "setup.py install") gives you access to the peak.util.symbols module, previously available only by installing the full PEAK toolkit. peak.util.symbols provides a Symbol type and two built-in symbols that are used by PEAK: NOT_FOUND and NOT_GIVEN.
WWW: http://peak.telecommunity.com/DevCenter/SymbolType
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