Inheritance and **kwargs popping/consumption

[Phuket2]

class TVView(ui.View):
	def __init__(self, data, *args, **kwargs):
		ui.View.__init__(self, *args, **kwargs)

Is there some trick to find out what kwargs have been consumed by the call to ui.View init

• list itemin the above example. I have seen in classes where the kwarg is used, it's pop'ed. I have tested this with ui.View, as far as I can understand the kwargs are not consumed/popped. Not saying they should be. But I would have thought this would be a common problem when using 3rd party Libs. But i can't find any specific information on it.

[omz]

There's no way to find out which of the keyword arguments a method actually uses. Why would you want that?

[Phuket2]

@omz , just to be able to act with certainty. Eg, as far as I know, you don't handle all kwargs passed to ui Elements. So by me calling the ui.View init method is totally redundant as i would have to iterate through all the kwargs again setting the attrs if I don't know what has been already handled. At least that is my understanding.

[ccc]

See the first code block under http://omz-software.com/pythonista/docs/ios/ui.html#building-custom-views

You don't need to call ui.View.__init__().

[Phuket2]

@ccc thanks. I see the comments about no need to call the super now that you pointed out. But I have being doing monkey see monkey do. I have seen code from omz where he passes on the args and kwargs to the super. Maybe it's old code. But I am sure I tested the above, and I don't think it gets passed on without calling init or super. I will check again.

[JonB]

# coding: utf-8
import ui

class doesnotcallsuperinit(ui.View):
   def __init__(self,*args,**kwargs):
      pass

class hasnoinit(ui.View):
   def somotherfunc(self):
      pass
      
class callssuperinit(ui.View):
   def __init__(self,*args,**kwargs):
      ui.View.__init__(self,*args,**kwargs)
def test_class(cls):
   obj=cls(bg_color='red')
   print '{} kwargs were {} properly initted'.format(cls.__name__,
               'NOT'*(not obj.bg_color==(1,0,0,1)))

test_class(doesnotcallsuperinit)
test_class(hasnoinit)
test_class(callssuperinit)
'''
doesnotcallsuperinit kwargs were NOT properly initted
hasnoinit kwargs were  properly initted
callssuperinit kwargs were  properly initted
'''

No need to call ui.View.init if you don't provide your own. If you do, you must call it.

In your case, you are really just better off handling them yourself, since not all attributes are settable in the constructor, and different components don't behave the way they are supposed to ( for example, TableView did not respond to flex in the constructor, at least in the last beta, Buttons and Labels i think behave differently if setting the title in the constructor vs after, i.e it autoresizes or not). Write a function that sets attributes then forget about it.

[Phuket2]

@JonB , thanks. It's very clear how you have explained it. I was trying to be correct. But respectively to @omz, the bottom line is that when he gets a chance to catch up, all args, kwargs should be handled in the constructors. When it's not , causes you too write a lot of extra code. It's not that it's that difficult, it just gets messy. If you could just pass a dict/kwargs to any ui element and have the attrs set, would be so nice with one addition, the parent view. If the parent is passed, then the constructor could add the new element to the sub view of the parent. Then you get a one liner.

[ccc]

For example, it would be nice if Scene.ShapeNode.__init__() took an anchor_point parameter.

[JonB]

Three lines (or one if you want to use list comprehension) isn't that much extra code. I agree it would be nice. If you want, you can make your own base class from which all of your customs inherit. Then simply import your custom class along with ui.

#. in customview.py
import ui
class CustomView(ui.View):
   def __init__(self,*args,**kwargs):
      ui.View.__init__(self,*args,**kwargs)
      for key in kwargs:
         if hasattr(self,key):
            setattr(self,key,kwargs[key])

# in someotherview.py
import ui
from customview import CustomView
class MyView(CustomView):
   def __init__(self,args,kwargs):
      CustomView.__init__(self,args,kwargs)
      #rest of your custom code