Actor constructor takes container as argument

actor.py

@@ -54,10 +54,10 @@ def decide_src_plt_cache_update(pvname):
 
 class Actor:
 
-    def __init__(self, pvname, cache_size=100):
+    def __init__(self, container, pvname, cache_size=100):
+        self.container = container
         self.src, plt, self.cache, self._update = decide_src_plt_cache_update(pvname)
         self.plt = Frame(plt)
-        self.container = None
 
     def update(self):
         self._update(self.plt, self.cache)

director.py

@@ -44,15 +44,13 @@ class Director:
             for n in line:
                 print("Add PV:", n)
                 try:
-                    a = Actor(n)
+                    a = Actor(figs_row, n)
                 except Exception as e:
                     print("caught:", type(e), e)
                 else:
                     def make_remover(x): #TODO: fix this
                         return lambda: self.remove_plot(x)
                     a.plt.on_click_close(make_remover(a))
-                    assert a.container is None
-                    a.container = figs_row
                     self.add_plot(a)
             figs_col.children.append(figs_row)
         self.plot_container.children.insert(0, figs_col)