docs: def timesteps(self):
          """
          Time-step at which this intervention occurs, starting from 0, the first intervention-period time-step.
          https://github.com/SwissTPH/openmalaria/wiki/GeneratedSchema32Doc#-deploy-1
          rtype: list
          """
          timesteps = []
          timed = self.et.find("timed")
  
          if timed is not None:
              for deploy in timed.findall("deploy"):
                  timesteps.append(deploy.attrib["time"])
  
          return timesteps