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Fix AttributeError in NQueensProblem (Issue #1308) #1309

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Fix AttributeError in NQueensProblem (Issue #1308) #1309

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2 changes: 1 addition & 1 deletion notebook.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1061,7 +1061,7 @@ def plot_NQueens(solution):
board = np.array([2 * int((i + j) % 2) for j in range(n) for i in range(n)]).reshape((n, n))
im = Image.open('images/queen_s.png')
height = im.size[1]
im = np.array(im).astype(np.float) / 255
im = np.array(im).astype(float) / 255
fig = plt.figure(figsize=(7, 7))
ax = fig.add_subplot(111)
ax.set_title('{} Queens'.format(n))
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25 changes: 17 additions & 8 deletions search.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -1120,7 +1120,7 @@
},
{
"cell_type": "code",
"execution_count": 14,
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
Expand All @@ -1132,7 +1132,11 @@
" # we use these two variables at the time of visualisations\n",
" iterations = 0\n",
" all_node_colors = []\n",
" node_colors = {k : 'white' for k in problem.graph.nodes()}\n",
" if hasattr(problem, 'graph'):\n",
" node_colors = {k : 'white' for k in problem.graph.nodes()}\n",
" else:\n",
" node_colors = {}\n",
"\n",
" \n",
" #Adding first node to the queue\n",
" frontier = deque([Node(problem.initial)])\n",
Expand Down Expand Up @@ -1208,7 +1212,7 @@
},
{
"cell_type": "code",
"execution_count": 16,
"execution_count": null,
"metadata": {},
"outputs": [],
"source": [
Expand All @@ -1220,7 +1224,10 @@
" # we use these two variables at the time of visualisations\n",
" iterations = 0\n",
" all_node_colors = []\n",
" node_colors = {k : 'white' for k in problem.graph.nodes()}\n",
" if hasattr(problem, 'graph'):\n",
" node_colors = {k : 'white' for k in problem.graph.nodes()}\n",
" else:\n",
" node_colors = {}\n",
" \n",
" #Adding first node to the stack\n",
" frontier = [Node(problem.initial)]\n",
Expand Down Expand Up @@ -5305,13 +5312,14 @@
},
{
"cell_type": "code",
"execution_count": 83,
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"dfts = depth_first_tree_search(nqp).solution()"
"_, _, goal_node = depth_first_tree_search(nqp) # Unpack the tuple\n",
"dfts = goal_node.solution()"
]
},
{
Expand Down Expand Up @@ -5361,13 +5369,14 @@
},
{
"cell_type": "code",
"execution_count": 86,
"execution_count": null,
"metadata": {
"collapsed": true
},
"outputs": [],
"source": [
"bfts = breadth_first_tree_search(nqp).solution()"
"_, _, goal_node = breadth_first_tree_search(nqp) # Unpack the tuple\n",
"bfts = goal_node.solution()"
]
},
{
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