old_contents: from flask.ext.appbuilder.widgets import RenderTemplateWidget
  
  class ChartWidget(RenderTemplateWidget):
  
      template = 'appbuilder/general/widgets/chart.html'
  
      route_base = ''
      chart_title = ''
      value_columns = []
      chart_type = ''
      chart_3d = 'false'
      
      
      def __init__(self, route_base = '',
                  chart_title = '',
                  chart_type = '',
                  chart_3d ='false',
                  value_columns = []):
                  
          self.route_base = route_base
          self.chart_title = chart_title
          self.chart_type = chart_type
          self.chart_3d = chart_3d
          self.value_columns = value_columns
          
      def __call__(self, **kwargs):
          kwargs['route_base'] = self.route_base
          kwargs['chart_title'] = self.chart_title
          kwargs['chart_type'] = self.chart_type
          kwargs['chart_3d'] = self.chart_3d 
          kwargs['value_columns'] = self.value_columns
          
          return super(ChartWidget, self).__call__(**kwargs)
  
  class ChartTimeWidget(ChartWidget):
      template = 'appbuilder/general/widgets/chart_time.html'
  
new_contents: from flask.ext.appbuilder.widgets import RenderTemplateWidget
  
  class ChartWidget(RenderTemplateWidget):
  
      template = 'appbuilder/general/widgets/chart.html'
  
      route_base = ''
      chart_title = ''
      value_columns = []
      chart_type = ''
      chart_3d = 'false'
      
      
      def __init__(self, route_base = '',
                  chart_title = '',
                  chart_type = '',
                  chart_3d ='false',
                  value_columns = []):
                  
          self.route_base = route_base
          self.chart_title = chart_title
          self.chart_type = chart_type
          self.chart_3d = chart_3d
          self.value_columns = value_columns
          
      def __call__(self, **kwargs):
          kwargs['route_base'] = self.route_base
          kwargs['chart_title'] = self.chart_title
          kwargs['chart_type'] = self.chart_type
          kwargs['chart_3d'] = self.chart_3d 
          kwargs['value_columns'] = self.value_columns
          
          return super(ChartWidget, self).__call__(**kwargs)
  
  
  
subject: Update widgets.py