code: def ylim(name, min, max):
      
      if name not in data_quants.keys():
          print("That name is currently not in pytplot.")
          return
      
      temp_data_quant = data_quants[name]
      temp_data_quant.yaxis_opt['y_range'] = [min, max]
      
      return
docs: This function will set the y axis range displayed for a specific tplot variable.
      
      Parameters:
          name : str
              The name of the tplot variable that you wish to set y limits for.  
          min : flt
              The start of the y axis.
          max : flt
              The end of the y axis.   
              
      Returns:
          None
      
      Examples:
          >>> # Change the y range of Variable1 
          >>> import pytplot
          >>> x_data = [1,2,3,4,5]
          >>> y_data = [1,2,3,4,5]
          >>> pytplot.store_data("Variable1", data={'x':x_data, 'y':y_data})
          >>> pytplot.ylim('Variable1', 2, 4)