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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def VFSMultiOpen(pathspecs, progress_callback=None):
 """Opens multiple files specified by given path-specs. See documentation for `VFSOpen` for more information. Args: pathspecs: A list of pathspec instances of files to open. progress_callback: A callback function to call to notify about progress Returns: A context manager yielding file-like objects. """

  precondition.AssertIterableType(pathspecs, rdf_paths.PathSpec)

  vfs_open = functools.partial(VFSOpen, progress_callback=progress_callback)
  return context.MultiContext(map(vfs_open, pathspecs))