Bird taxonomy system: internal maintenance specification

This method uppercases and blank-fills its argument and looks it up in the self.__abbrTex dictionary.

# - - -   T x n y . a b b r T o T e x   - - -

    def abbrToTex ( self, abbr ):
        """Lookup the TeX name corresponding to abbr.
        """
        return self.__abbrTex [ abbr.upper().ljust(ABBR_L) ]