<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def transpose(self):
 """Create a transpose of this matrix."""

        ma4 = Matrix4(self.get_col(0),
                      self.get_col(1),
                      self.get_col(2),
                      self.get_col(3))
        return ma4