text: from typing import Any, List, Dict
  
  
  def parse_timeseries(
      timeseries_str, time_input_unit="minute", time_output_unit="second"
  ) -> List[List[float]]:
      """Create a list of 2-list [timestep (seconds), value (mm/hour)]."""
      if not timeseries_str:
          return [[]]
      output = []
      for line in timeseries_str.split():
          timestep, value = line.split(",")
          if time_input_unit == "second":
              timestep = int(timestep.strip())
          else:
              timestep = int(timestep.strip())
              if time_output_unit == "second":
                  timestep *= 60
          output.append([timestep, float(value.strip())])
      return output
  
  
  def strip_dict_none_values(value: Any):
      if isinstance(value, List):
          for x in value:
              strip_dict_none_values(x)
      if isinstance(value, Dict):
          to_delete = []
          for k, v in value.items():
              if v == None:
                  to_delete.append(k)
              else:
                  strip_dict_none_values(v)
  
          for x in to_delete:
              del value[x]
  