code: def from_string(data_str):
          
          lines = data_str.strip().split('\n')
          err_msg = ("Invalid input string format. Is this string generated by "
                     "MonsoonData class?")
          conditions = [
              len(lines) <= 4, "Average Current:" not in lines[1],
              "Voltage: " not in lines[2], "Total Power: " not in lines[3],
              "samples taken at " not in lines[4],
              lines[5] != "Time" + ' ' * 7 + "Amp"
          ]
          if any(conditions):
              raise MonsoonError(err_msg)
          hz_str = lines[4].split()[2]
          hz = int(hz_str[:-2])
          voltage_str = lines[2].split()[1]
          voltage = int(voltage_str[:-1])
          lines = lines[6:]
          t = []
          v = []
          for l in lines:
              try:
                  timestamp, value = l.split(' ')
                  t.append(int(timestamp))
                  v.append(float(value))
              except ValueError:
                  raise MonsoonError(err_msg)
          return MonsoonData(v, t, hz, voltage)
docs: Creates a MonsoonData object from a string representation generated
          by __str__.
  
          Args:
              str: The string representation of a MonsoonData.
  
          Returns:
              A MonsoonData object.