<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def overlaps(self,tx2):
 """Return True if overlapping """

    total = 0
    for e1 in self.exons:
      for e2 in tx2.exons:
        if e1.overlap_size(e2) > 0: return True
    return False