get input and return output from website with wsgi

def get_post_form(environ):
    assert is_post_request(environ)
    input = environ['wsgi.input']
    post_form = environ.get('wsgi.post_form')
    if (post_form is not None
        and post_form[0] is input):
        return post_form[2]
    # This must be done to avoid a bug in cgi.FieldStorage
    environ.setdefault('QUERY_STRING', '')
    fs = cgi.FieldStorage(fp=input,
                          environ=environ,
                          keep_blank_values=1)
    new_input = InputProcessed('')
    post_form = (new_input, input, fs)
    environ['wsgi.post_form'] = post_form
    environ['wsgi.input'] = new_input
    return fs

class InputProcessed(object):
    def read(self, *args):
        raise EOFError('The wsgi.input stream has already been consumed')
    readline = readlines = __iter__ = read