How to use the mechanicalsoup.browser.Browser function in MechanicalSoup

def post(self, *args, **kwargs):
        """Straightforward wrapper around `requests.Session.post
        `__.

        :return: `requests.Response
            `__
            object with a *soup*-attribute added by :func:`add_soup`.
        """
        response = self.session.post(*args, **kwargs)
        Browser.add_soup(response, self.soup_config)
        return response

from .utils import LinkNotFoundError
from .form import Form
import sys
import re
import bs4


class _BrowserState:
    def __init__(self, page=None, url=None, form=None, request=None):
        self.page = page
        self.url = url
        self.form = form
        self.request = request


class StatefulBrowser(Browser):
    """An extension of :class:`Browser` that stores the browser's state
    and provides many convenient functions for interacting with HTML elements.
    It is the primary tool in MechanicalSoup for interfacing with websites.

    :param session: Attach a pre-existing requests Session instead of
        constructing a new one.
    :param soup_config: Configuration passed to BeautifulSoup to affect
        the way HTML is parsed. Defaults to ``{'features': 'lxml'}``.
        If overriden, it is highly recommended to `specify a parser
        `__.
        Otherwise, BeautifulSoup will issue a warning and pick one for
        you, but the parser it chooses may be different on different
        machines.
    :param requests_adapters: Configuration passed to requests, to affect
        the way HTTP requests are performed.
    :param raise_on_404: If True, raise :class:`LinkNotFoundError`