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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _init_browser(self):
 """ Ovveride this method with the appropriate way to prepare a logged in browser. """

        self.browser = mechanize.Browser()
        self.browser.set_handle_robots(False)
        self.browser.open(self.server_url + "/youraccount/login")
        self.browser.select_form(nr=0)
        try:
            self.browser['nickname'] = self.user
            self.browser['password'] = self.password
        except:
            self.browser['p_un'] = self.user
            self.browser['p_pw'] = self.password
        # Set login_method to be writable
        self.browser.form.find_control('login_method').readonly = False
        self.browser['login_method'] = self.login_method
        self.browser.submit()