[web2py] html form in web2py(reply needed urgently)

[qwer qwer]

{{form=FORM('Your comment:',INPUT(_comment='_comment', 
requires=IS_NOT_EMPTY()),
          INPUT(_type='submit'))
if form.accepts(request,session): response.flash = 'Your information has 
been sent successfully'}}
{{=form}}


i wrote this in default/index . it displays a form ,but when submitted does 
n't flash why??(I'm a new user.--may be the dbt is very silly) :)
 
I want a html form attribute name accessible to python.how...thanks.

--