Dispay pydoc's description as part of argparse '--help'

Dispay pydoc's description as part of argparse '--help'

I am using argparse.ArgumentParser() in my script, i would like to display
the pydoc description of my script as part of the '--help' option of the
argparse.
One possibly solution can be to use the formatter_class or the description
attribute of ArgumentParser to configure the displaying of help. But in
this case, we need to use the 'pydoc' command internally to fetch the
description.
Do we some other ways(possibly elegant) to do it ?