<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def type(self):
 """return the type of the Line """

        properties = {self.is_code: "code",
                      self.is_data: "data",
                      self.is_string: "string",
                      self.is_tail: "tail",
                      self.is_unknown: "unknown"}
        for k, v in properties.items():
            if k: return v