I have a view like this

class PathView (ui.View):
    def __init__(self, *arg, **kw):
        print(arg, kw)    # notice here!
        self.flex = 'WH'
        self.path = None
        self.paths = []
        self.action = None

And I made a pyui, use the custom view PathView, and put some custom attributes like this:

{"bc": "oooo" }

When I run the first script, it printed this:

() {}

Why？How should I use it?