DROP(plot): executed arg from plotting ...

now embeded in `Solution`.

Author: ankostis

graphtik/base.py

@@ -185,9 +185,10 @@ def plot(
             as an "inverted-house"
         :param solution:
             an optional dict with values to annotate nodes, drawn "filled"
-            (currently content not shown, but node drawn as "filled")
-        :param executed:
-            an optional container with operations executed, drawn "filled"
+            (currently content not shown, but node drawn as "filled").
+            It extracts more infos from a :class:`.Solution` instance, such as,
+            if `solution` has an ``executed`` attribute, operations contained in it
+            are  drawn as "filled".
         :param title:
             an optional string to display at the bottom of the graph
         :param node_props:

graphtik/plot.py

@@ -144,7 +144,6 @@ def build_pydot(
     inputs=None,
     outputs=None,
     solution=None,
-    executed=None,
     title=None,
     node_props=None,
     edge_props=None,
@@ -226,7 +225,7 @@ def get_node_name(a):
             if steps and nx_node in steps:
                 kw["penwdth"] = steps_thickness
             shape = "egg" if isinstance(nx_node, NetworkOperation) else "oval"
-            if executed and nx_node in executed:
+            if nx_node in getattr(solution, "executed", ()):
                 kw["style"] = "filled"
                 kw["fillcolor"] = fill_color
             try: