error = 'Invalid username/password'
- # this is executed if the request method was GET or the
- # credentials were invalid
+ # the code below this is executed if the request method
+ # was GET or the credentials were invalid
+ return render_template('login.html', error=error)
What happens if the key does not exist in the `form` attribute? In that
case a special :exc:`KeyError` is raised. You can catch it like a