my-first-blog/myvenv/Lib/site-packages/setuptools/command/saveopts.py

from setuptools.command.setopt import edit_config, option_base


class saveopts(option_base):
    """Save command-line options to a file"""

    description = "save supplied options to setup.cfg or other config file"

    def run(self):
        dist = self.distribution
        settings = {}

        for cmd in dist.command_options:

            if cmd == 'saveopts':
                continue  # don't save our own options!

            for opt, (src, val) in dist.get_option_dict(cmd).items():
                if src == "command line":
                    settings.setdefault(cmd, {})[opt] = val

        edit_config(self.filename, settings, self.dry_run)