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This method builds the internal .__txKeyMap and .__sciMap dictionaries.
# - - - T x n y . _ _ b u i l d M a p s - - -
def __buildMaps ( self ):
"""Build the key and scientific name maps.
[ self.__txKeyMap := as invariant, from self.root and its
descendants
self.__sciMap := as invariant, from self.root and its
descendants ]
"""
#-- 1 --
self.__txKeyMap = {}
self.__sciMap = {}
Recursion takes care of visiting every Taxon node starting at self.root.
#-- 2 --
# [ self.__txKeyMap +:= entries whose values are the Taxon
# instances rooted in self.root and whose keys are the
# .txKey attributes of those Taxon instances
# self.__sciMap +:= entries whose values are the Taxon
# instances rooted in self.root and whose keys are the
# .sci attributes of those Taxon instances ]
self.__addTaxonMaps ( self.root )