Do not expect Boundary to have 2 elements

graph_tools/base.py

@@ -225,13 +225,13 @@ def _init_():
       size = len(sorted_boundaries)
 
       m = matrix(QQ, size, size, {
-        (rename[row], rename[col]): value
+        (rename[b.boundary], rename[col]): b.value
         for col in sorted_boundaries
-        for row, value in self._next_gadget(FakeGadget(start_gadget.size(), [ Boundary(col, 1) ])).eval_gadget(parameter)
+        for b in self._next_gadget(FakeGadget(start_gadget.size(), [ Boundary(col, 1) ])).eval_gadget(parameter)
       })
 
       iv = matrix(QQ, size, 1, {
-        (rename[row], 0): v for row, v in start_gadget.eval_gadget(parameter)
+        (rename[b.boundary], 0): b.value for b in start_gadget.eval_gadget(parameter)
       })
 
       fin = matrix(QQ, 1, size, {

graph_tools/parameters.py

@@ -234,8 +234,8 @@ def _init_():
       >>> def test(*args): return list(CircuitDoubleCover.join_edges(*args))
       >>> test(B(((1,2), (2,3), (1,3), None), 1), 1, 2)
       []
-      >>> test(B(((1,2), (2,3), (1,4), (3,4), None), 1), 1, 2)
-      [Boundary(boundary=((3, 2), (2, 3), (3, 2), (3, 2), None), value=1)]
+      >>> assert test(B(((1,2), (2,3), (1,4), (3,4), None), 1), 1, 2) == \
+            [B(((3, 2), (2, 3), (3, 2), (3, 2), None), 1)]
       >>> test(B(((1,2), (2,3), (1,4), (3,4), None, (1,3)), 1), 1, 2)
       []
       >>> len(test(B(((1,2), (2,3), (4,5), (1,3), (4,5), None), 1), 1, 2))

graph_tools/tests.py

@@ -21,7 +21,7 @@ True
 >>> Necklace.stabilize(CircuitDoubleCover)
 Loop 1 done - 1 boundaries (0 new)
 {'variables': [((1, 2), (1, 2), None)], 'step_matrix': [4], 'initial_vector': [2], 'finalize': [1]}
->>> sun_cdc = lambda n: sum( v for _, v in sun(n).eval_gadget(CircuitDoubleCover) )
+>>> sun_cdc = lambda n: sum( b.value for b in sun(n).eval_gadget(CircuitDoubleCover) )
 >>> all( sun_cdc(n) == 2**n - 2*n for n in range(3, 10) )
 True