code: def rfc822_escape(header):
      """Return a version of the string escaped for inclusion in an
      RFC-822 header, by ensuring there are 8 spaces space after each newline.
      """
      lines = header.split("\n")
      sep = "\n" + 8 * " "
      return sep.join(lines)
  
imports: import os
  import re
  import importlib.util
  import string
  import sys
  import distutils
  from distutils.errors import DistutilsPlatformError
  from distutils.dep_util import newer
  from distutils.spawn import spawn
  from distutils import log
  from distutils.errors import DistutilsByteCompileError
label_desc: Use image node_id 13 for calling a global function with example usage: rfc822_escape(header) and returns: sep