code: def _decorate_axes(ax, freq, kwargs):
      
      if not hasattr(ax, '_plot_data'):
          ax._plot_data = []
  
      ax.freq = freq
      xaxis = ax.get_xaxis()
      xaxis.freq = freq
      if not hasattr(ax, 'legendlabels'):
          ax.legendlabels = [kwargs.get('label', None)]
      else:
          ax.legendlabels.append(kwargs.get('label', None))
      ax.view_interval = None
      ax.date_axis_info = None
docs: Initialize axes for time-series plotting