code: def slew(self, value):
          '''move to a given position in the file'''
          if float(value) != self.filepos:
              pos = float(value) * self.filesize
              self.mlog.f.seek(int(pos))
              self.find_message(f slew(self, value):
          '''move to a given position in the file'''
          if float(value) != self.filepos:
              pos = float(value) * self.filesize
              self.mlog.f.seek(int(pos))
              self.find_message()
docs: move to a given position in the file