class_docstr: Bar graph class
docstr: Draw bars for series and secondary series
code: def _plot(self):
      """Draw bars for series and secondary series"""
      for serie in self.series:
          self.bar(serie)
      for serie in self.secondary_series:
          self.bar(serie, True)
  
file_path: pygal/pygal/graph/bar.py
imports: from pygal.graph.graph import Graph
  from pygal.util import alter, decorate, ident, swap
label_desc: Use image node_id 5 for calling the Bar obj's underlying member method code with example usage: obj._plot() without return types