code: def readLine(self):
          
  
          # Read line
          line = self._f.readline().decode('ascii', 'ignore')
          if not line:
              raise EOFError()
          line = line.strip()
  
          if line.startswith('v '):
              # self._vertices.append( *self.readTuple(line) )
              self._v.append(self.readTuple(line))
          elif line.startswith('vt '):
              self._vt.append(self.readTuple(line, 3))
          elif line.startswith('vn '):
              self._vn.append(self.readTuple(line))
          elif line.startswith('f '):
              self._faces.append(self.readFace(line))
          elif line.startswith('#'):
              pass  # Comment
          elif line.startswith('mtllib '):
              logger.warning('Notice reading .OBJ: material properties are '
                             'ignored.')
          elif any(line.startswith(x) for x in ('g ', 's ', 'o ', 'usemtl ')):
              pass  # Ignore groups and smoothing groups, obj names, material
          elif not line.strip():
              pass
          else:
              logger.warning('Notice reading .OBJ: ignoring %s command.'
                             % line.strip())
docs: The method that reads a line and processes it.