class_docstr: A file object that provides read access to a part of an existing
  file (for example a TAR file).
docstr: Create file object.
  
  :param file: Existing file.
  :param offset: Start of region, in bytes.
  :param length: Size of region, in bytes.
docstr_tok: ["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/py3/PIL/ContainerIO.py
imports: import io
label_desc: Use image node_id 1 to create a new ContainerIO object  with example: obj = ContainerIO(file, offset, length)