code: def plot_iv_curve(a, hold_v, i, *plt_args, **plt_kwargs):    
      
      grid = plt_kwargs.pop('grid',True)
      same_fig = plt_kwargs.pop('same_fig',False) 
      if not len(plt_args):
          plt_args = ('ko-',)
      if 'label' not in plt_kwargs: 
          plt_kwargs['label'] = 'Current'
      if not same_fig:
          make_iv_curve_fig(a, grid=grid)
      if type(i) is dict:
          i = [i[v] for v in hold_v]
      plt.plot([v*1e3 for v in hold_v], [ii*1e12 for ii in i], *plt_args, **plt_kwargs)
      plt.legend(loc=2)
docs: A single IV curve