code: def colDelete(self,colI=-1):
          
  #        print("DELETING COLUMN: [%d] %s"%(colI,self.colDesc[colI]))
          self.colNames.pop(colI)
          self.colDesc.pop(colI)
          self.colUnits.pop(colI)
          self.colComments.pop(colI)
          self.colTypes.pop(colI)
          self.colData.pop(colI)
          return
docs: delete a column at a single index. Negative numbers count from the end.