code: def __init__(self, f):
      self._f = f
  
imports: import numpy
  import time
  from gzip import GzipFile
  from os import path
  from ..geometry import _calculate_normals
  from ..util import logger
label_desc: Use image node_id 1 to create a new WavefrontWriter object from inherited base classes: object with example: obj = WavefrontWriter(f)