docstr: Create file object.
  
  :param file: Existing file.
  :param offset: Start of region, in bytes.
  :param length: Size of region, in bytes.
code: def __init__(self, file, offset, length):
      """
      Create file object.
  
      :param file: Existing file.
      :param offset: Start of region, in bytes.
      :param length: Size of region, in bytes.
      """
      self.fh = file
      self.pos = 0
      self.offset = offset
      self.length = length
      self.fh.seek(offset)
  
file_path: catboost/contrib/python/Pillow/py2/PIL/ContainerIO.py
imports: import io
label_desc: Use image node_id 1 to create a new ContainerIO object from inherited base classes: object with example: obj = ContainerIO(file, offset, length)