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48. class SplitLayout: Column layout for split years

This class implements the interface described in Section 46, “class ColumnLayout: Column layout controller” for the split-year case, where each effort key gets its own column in the main table.

cbchistlib.py
# - - - - -   c l a s s   S p l i t L a y o u t

class SplitLayout(ColumnLayout):
    '''Column dispatcher for split years (one column per effort).

      State/Invariants:
        ._keyList:
          [ a list of the unique effort-keys in self, in ascending
            order ]
        ._keyColxMap:
          [ a dictionary whose keys are the effort-keys in self,
            and each related value is the logical column number
            in which that effort is displayed ]
    '''