code: def write(self, basename = 'graph', layout = None, format='png'):
          '''
          API:
              write(self, basename = 'graph', layout = None, format='png')
          Description:
          Writes graph to dist using layout and format.
          Input:
              basename: name of the file that will be written.
              layout: Dot layout for generating graph image.
              format: Image format, all format supported by Dot are wellcome.
          Post:
              File will be written to disk.
          '''
          if layout == None:
              layout = self.get_layout()
          f = open(basename, "w+b")
          if format == 'dot':
              f.write(self.to_string())
          else:
              f.write(self.create(layout, format))
          f.close(f write(self, basename = 'graph', layout = None, format='png'):
          '''
          API:
              write(self, basename = 'graph', layout = None, format='png')
          Description:
          Writes graph to dist using layout and format.
          Input:
              basename: name of the file that will be written.
              layout: Dot layout for generating graph image.
              format: Image format, all format supported by Dot are wellcome.
          Post:
              File will be written to disk.
          '''
          if layout == None:
              layout = self.get_layout()
          f = open(basename, "w+b")
          if format == 'dot':
              f.write(self.to_string())
          else:
              f.write(self.create(layout, format))
          f.close()
docs: API:
              write(self, basename = 'graph', layout = None, format='png')
          Description:
          Writes graph to dist using layout and format.
          Input:
              basename: name of the file that will be written.
              layout: Dot layout for generating graph image.
              format: Image format, all format supported by Dot are wellcome.
          Post:
              File will be written to disk.