code: def gen_header(self):
      epm = EntryPoint.parse_map(self.distribution.entry_points or "")
      ep = epm.get("setuptools.installation", {}).get("eggsecutable")
      if ep is None:
          return "w"  # not an eggsecutable, do it the usual way.
  
      if not ep.attrs or ep.extras:
          raise DistutilsSetupError(
              "eggsecutable entry point (%r) cannot have 'extras' "
              "or refer to a module" % (ep,)
          )
  
      pyver = "{}.{}".format(*sys.version_info)
      pkg = ep.module_name
      full = ".".join(ep.attrs)
      base = ep.attrs[0]
      basename = os.path.basename(self.egg_output)
  
      header = (
          "#!/bin/sh\n"
          'if [ `basename $0` = "%(basename)s" ]\n'
          'then exec python%(pyver)s -c "'
          "import sys, os; sys.path.insert(0, os.path.abspath('$0')); "
          "from %(pkg)s import %(base)s; sys.exit(%(full)s())"
          '" "$@"\n'
          "else\n"
          "  echo $0 is not the correct name for this egg file.\n"
          "  echo Please rename it back to %(basename)s and try again.\n"
          "  exec false\n"
          "fi\n"
      ) % locals()
  
      if not self.dry_run:
          mkpath(os.path.dirname(self.egg_output), dry_run=self.dry_run)
          f = open(self.egg_output, "w")
          f.write(header)
          f.close()
      return "a"
  
imports: from distutils.errors import DistutilsSetupError
  from distutils.dir_util import remove_tree, mkpath
  from distutils import log
  from types import CodeType
  import sys
  import os
  import re
  import textwrap
  import marshal
  from setuptools.extern import six
  from pkg_resources import get_build_platform, Distribution, ensure_directory
  from pkg_resources import EntryPoint
  from setuptools.extension import Library
  from setuptools import Command
label_desc: Use image node_id 9 for calling the bdist_egg obj's underlying member method code with example usage: obj.gen_header() and returns: str, str