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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def ListHuntApprovals(context=None):
 """List all hunt approvals belonging to requesting user."""

  items = context.SendIteratorRequest("ListHuntApprovals",
                                      hunt_pb2.ApiListHuntApprovalsArgs())

  def MapHuntApproval(data):
    return HuntApproval(data=data, username=context.username, context=context)

  return utils.MapItemsIterator(MapHuntApproval, items)