code: def _try_manpage(self, parser):
      try:
          import subprocess
  
          # get the datalad manpage to use
          manfile = os.environ.get(
              "MANPATH", "/usr/share/man"
          ) + "/man1/{0}.1.gz".format(parser.prog.replace(" ", "-"))
          # extract version field from the manpage
          if not os.path.exists(manfile):
              raise IOError("manfile is not found")
          with gzip.open(manfile) as f:
              man_th = [line for line in f if line.startswith(b".TH")][
                  0
              ]
          man_version = (
              man_th.split(b" ")[-1].strip(b" '\"\t\n").decode("utf-8")
          )
  
          # don't show manpage if man_version not equal to current datalad_version
          if __version__ != man_version:
              raise ValueError
          subprocess.check_call(
              "man %s 2> /dev/null" % manfile, shell=True
          )
          sys.exit(0)
      except (
          subprocess.CalledProcessError,
          IOError,
          OSError,
          IndexError,
          ValueError,
      ) as e:
          ce = CapturedException(e)
          lgr.debug("Did not use manpage since %s", ce)
  
imports: import argparse
  import os
  import re
  import sys
  import gzip
  import textwrap
  from textwrap import wrap
  from datalad import __version__
  from datalad.support.exceptions import CapturedException
  from datalad.ui.utils import get_console_width
  from datalad.utils import is_interactive
  from platformdirs import AppDirs
  from logging import getLogger
label_desc: Use image node_id 5 for calling the HelpAction obj's underlying member method code with example usage: obj._try_manpage(parser) without return types