class_docstr: Line graph class
class_docstr_tok: ["Line","graph","class"]
docstr: Plot the serie lines and secondary serie lines
docstr_tok: ["Plot","the","serie","lines","and","secondary","serie","lines"]
code: def _plot(self):
      """Plot the serie lines and secondary serie lines"""
      for serie in self.series:
          self.line(serie)
  
      for serie in self.secondary_series:
          self.line(serie, True)
  
file_path: pygal/pygal/graph/line.py
imports: from pygal.graph.graph import Graph
  from pygal.util import alter, cached_property, decorate
label_desc: Use image node_id 7 for calling the Line obj's underlying member method code with example usage: obj._plot() without return types