def batch(vars, oldvars, ns):
        """
        Context manager to only update listeners
        at the end, in the meantime it doesn't
        matter what intermediate state the vars
        are in (they can be added and removed)

        >>> with VarListener.batch()
        ...     pass
        """
        snapshot_vars = dict(vars)

        with VarListener.disabled():
            yield

        added_vars = set(oldvars.keys()) - set(snapshot_vars.keys())
        deleted_vars = set(snapshot_vars.keys()) - set(oldvars.keys())
        existing_vars = set(vars.keys()) - added_vars - deleted_vars
        for name in existing_vars:
            old_var = snapshot_vars[name]
            new_var = vars[name]
            if old_var.type != new_var.type or old_var.min != new_var.min or old_var.max != new_var.max:
                deleted_vars.add(name)
                added_vars.add(name)
                if old_var.type == new_var.type:
                    new_var.value = old_var.value

        for listener in VarListener.listeners:
            for name in deleted_vars:
                listener.var_deleted(snapshot_vars[name])
                if ns.get(name) is snapshot_vars[name].value:
                    del ns[name]
            for name in added_vars:
                listener.var_added(vars[name])
def batch(vars, oldvars, ns):
        """
        Context manager to only update listeners
        at the end, in the meantime it doesn't
        matter what intermediate state the vars
        are in (they can be added and removed)

        >>> with VarListener.batch()
        ...     pass
        """
        snapshot_vars = dict(vars)

        with VarListener.disabled():
            yield

        added_vars = set(oldvars.keys()) - set(snapshot_vars.keys())
        deleted_vars = set(snapshot_vars.keys()) - set(oldvars.keys())
        existing_vars = set(vars.keys()) - added_vars - deleted_vars
        for name in existing_vars:
            old_var = snapshot_vars[name]
            new_var = vars[name]
            if old_var.type != new_var.type or old_var.min != new_var.min or old_var.max != new_var.max:
                deleted_vars.add(name)
                added_vars.add(name)
                if old_var.type == new_var.type:
                    new_var.value = old_var.value

        for listener in VarListener.listeners:
            for name in deleted_vars:
                listener.var_deleted(snapshot_vars[name])
                if ns.get(name) is snapshot_vars[name].value:
                    del ns[name]
            for name in added_vars:
                listener.var_added(vars[name])
def batch ( vars , oldvars , ns ) : snapshot_vars = dict ( vars ) with VarListener . disabled ( ) : yield added_vars = set ( oldvars . keys ( ) ) - set ( snapshot_vars . keys ( ) ) deleted_vars = set ( snapshot_vars . keys ( ) ) - set ( oldvars . keys ( ) ) existing_vars = set ( vars . keys ( ) ) - added_vars - deleted_vars for name in existing_vars : old_var = snapshot_vars [ name ] new_var = vars [ name ] if old_var . type != new_var . type or old_var . min != new_var . min or old_var . max != new_var . max : deleted_vars . add ( name ) added_vars . add ( name ) if old_var . type == new_var . type : new_var . value = old_var . value for listener in VarListener . listeners : for name in deleted_vars : listener . var_deleted ( snapshot_vars [ name ] ) if ns . get ( name ) is snapshot_vars [ name ] . value : del ns [ name ] for name in added_vars : listener . var_added ( vars [ name ] )
Context manager to only update listeners
        at the end, in the meantime it doesn't
        matter what intermediate state the vars
        are in (they can be added and removed)

        >>> with VarListener.batch()
        ...     pass
Context manager to only update listeners at the end in the meantime it doesn t matter what intermediate state the vars are in ( they can be added and removed )