How to use the mechanicalsoup.utils function in MechanicalSoup

def test_issue180():
    """Test that a KeyError is not raised when Form.choose_submit is called
    on a form where a submit element is missing its name-attribute."""
    browser = mechanicalsoup.StatefulBrowser()
    html = '''
<form>
  <input value="Invalid" type="submit">
  <input value="Valid" name="valid" type="submit">
</form>
'''
    browser.open_fake_page(html)
    form = browser.select_form()
    with pytest.raises(mechanicalsoup.utils.LinkNotFoundError):
        form.choose_submit('not_found')

def test_form_not_found():
    browser = mechanicalsoup.StatefulBrowser()
    browser.open_fake_page(page_with_various_fields)
    form = browser.select_form('form')
    with pytest.raises(mechanicalsoup.utils.LinkNotFoundError):
        form.input({'foo': 'bar', 'nosuchname': 'nosuchval'})
    with pytest.raises(mechanicalsoup.utils.LinkNotFoundError):
        form.check({'foo': 'bar', 'nosuchname': 'nosuchval'})
    with pytest.raises(mechanicalsoup.utils.LinkNotFoundError):
        form.check({'entree': 'cheese'})
    with pytest.raises(mechanicalsoup.utils.LinkNotFoundError):
        form.check({'topping': 'tofu'})
    with pytest.raises(mechanicalsoup.utils.LinkNotFoundError):
        form.textarea({'bar': 'value', 'foo': 'nosuchval'})
    with pytest.raises(mechanicalsoup.utils.LinkNotFoundError):
        form.set_radio({'size': 'tiny'})
    with pytest.raises(mechanicalsoup.utils.LinkNotFoundError):
        form.set_select({'entree': ('no_multiple', 'no_multiple')})

error("[{:10s}] Found captcha on page loading!".format(name))
		return

	try:
		browser.select_form(form1)
		browser[e_form] = email
	except ms.utils.LinkNotFoundError:
		error("[{:10s}] Something wrong in parsing, maybe it displayed captcha!".format(name))
		return

	try:
		browser.submit_selected()
		browser.select_form(form2)
		browser[p_form] = pwd
		browser.submit_selected()
	except ms.utils.LinkNotFoundError:
		browser.close()
		error("[{:10s}] Email not registered!".format(name))
		return

	if is_there_captcha(browser.get_current_page().text):
		error("[{:10s}] Found captcha after submitting login page!".format(name))
		return
	#Now let's check if it was success by trying to use the same form again and if I could use it then the login not success
	try:
		browser.select_form(form2)
		browser.close()
		error("[{:10s}] Login unsuccessful!".format(name))
	except:
		browser.close()
		status("[{:10s}] Login successful!".format(name))
	#That's a lot of exceptions :"D