__init__.py 文件源码

def is_fileobj(f):
  """ Check if an object `f` is intance of FileIO object created
  by `open()`"""
  return isinstance(f, io.TextIOBase) or \
      isinstance(f, io.BufferedIOBase) or \
      isinstance(f, io.RawIOBase) or \
      isinstance(f, io.IOBase)