Python 2.7.10 (default, Aug  4 2015, 15:36:58)
[GCC 4.2.1 20070831 patched [FreeBSD]] on freebsd9
Type "help", "copyright", "credits" or "license" for more information.

>>> import mechanize
>>> import cookielib
>>> br = mechanize.Browser()
>>> cj = cookielib.LWPCookieJar()
>>> br.set_cookiejar(cj)
>>> br.set_handle_equiv(True)
>>> br.set_handle_redirect(True)
>>> br.set_handle_referer(True)
>>> br.set_handle_robots(False)
>>> br.set_handle_refresh(mechanize._http.HTTPRefreshProcessor(), max_time=1)
>>> br.addheaders = [('User-agent', 'Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.1) Gecko/2008071615 Fedora/3.0.1-1.fc9 Firefox/3.0.1')]
>>> r = br.open('http://192.168.1.1/restart.lp?tid=RESTART')
>>> html = r.read()
>>> print html

Output snippet:
<form name='Restart'  method='post' action='/rebooting.lp'>
    <input type="hidden" name="rn" value="1750705504">
    <input type='hidden' name='restart' value='1'>
    <input type='hidden' name='reboot_action' value='reboot'>

    <input type='button' name='18' value='Yes, restart my MediaAccess Gateway'      onClick='submitForm(document.Restart,0,0,"","",0,"")' >
    <input type='button' name='20' value='No' onClick='GoAndRemember("/cgi/b/info/","")' >
</form>

Submitting the "Yes"-button errors:
>>> br.submit(name='18')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "mechanize/_mechanize.py", line 541, in submit
    return self.open(self.click(*args, **kwds))
  File "mechanize/_mechanize.py", line 530, in click
    request = self.form.click(*args, **kwds)
  File "mechanize/_form.py", line 2999, in click
    self._request_class)
  File "mechanize/_form.py", line 3192, in _click
    name, type, "clickable", id, label, None, nr)
  File "mechanize/_form.py", line 3185, in _find_control
    raise ControlNotFoundError("no control matching "+description)
mechanize._form.ControlNotFoundError: no control matching name '18', kind 'clickable'

>>> br.button(name='18')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "mechanize/_mechanize.py", line 629, in __getattr__
    return getattr(form, name)
  File "mechanize/_form.py", line 2682, in __getattr__
    return getattr(HTMLForm, name)
AttributeError: class HTMLForm has no attribute 'button'