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This question already has an answer here: A get() like method for checking for Python attributes 3 answers I have an object myobject , which might return None . If it returns None , it won't return an attribute id : a = myobject.id So when myobject is None , the stament above results in a AttributeError : AttributeError: 'NoneType' object has no attribute 'id' If myobject is None, then I want a to be equal to None . How do I avoid this exception in one line statement, such as: a = default(myobject.id, None) Inbar Rose You should use the getattr wrapper instead of directly retrieving the value

I have such lines in routes.rb: scope "/:subdomain/" do resource :order, :only => [:new, :create, :show, :update, :edit, :destroy] do get :cancel, :on => :member put :counter, :on => :member end end And for example, this is typical url: http://mydomain.com/some_subdomain/order/new . This url is mapped to action new of orders controller with params[:subdomain] = "some_subdomain". I want to use named route new_order_url(:subdomain => "some_subdomain"). But I want to map http://mydomain.com/order/new to orders controller, action new and params[:subdomain] = "default". And I want to use named

I’m working with basic HTML <input type="text"/> text field with a numeric value. I’m adding JavaScript event keyup to see when user presses arrow up key ( e.which == 38 ) – then I increment the numeric value. The code works well, but there’s one thing that bugs me. Both Safari/Mac and Firefox/Mac move cursor at the very beginning when I’m pressing the arrow up key. This is a default behavior for every <input type="text"/> text field as far as I know and it makes sense. But this creates not a very aesthetic effect of cursor jumping back and forward (after value was altered). The jump at the

I set the color to red , and after that I want to set the color again back to default, but I do not know what is default color, does anyone knows ? You can save old color and then use it to restore the original value. Here is an example: ColorStateList oldColors = textView.getTextColors(); //save original colors textView.setTextColor(Color.RED); .... textView.setTextColor(oldColors);//restore original colors But in general default TextView text color is determined from current Theme applied to your Activity . Actually the color TextView is: android:textColor="@android:color/tab_indicator_text"

A schematic of my problem... class A { public: // etc. protected: uint num; }; class B : public A { public: void foo(uint x = num); //bad }; gives this error: error: invalid use of non-static data member ‘A::num’ error: from this location Why does this happen, and what can I do to work around this? I suspect this happens (based on the complaint about non-staticness) because there is no this pointer for it to use to know which instance of B it should get num from. The Microsoft compiler (at least) allows you to specify an expression, but not a non-static member. From MSDN : The expressions used