1 files changed, 82 insertions, 0 deletions
diff --git a/python/problems/dictionaries/successors/common.py b/python/problems/dictionaries/successors/common.py
new file mode 100644
index 0000000..5f824f5
--- /dev/null
+++ b/python/problems/dictionaries/successors/common.py
@@ -0,0 +1,82 @@
+import re
+from python.util import has_token_sequence, string_almost_equal, \
+    string_contains_number, get_tokens, get_numbers, get_exception_desc
+from server.hints import Hint
+
+id = 20609
+number = 10
+visible = True
+
+solution = '''\
+def children(tree, name):
+    if name in tree:
+        return tree[name]
+    return []
+
+def successors(tree, name):
+    names = []
+    for child in children(tree, name):
+        names.append(child)
+        names.extend(successors(tree, child))
+    return names
+'''
+
+hint_type = {
+    'final_hint': Hint('final_hint')
+}
+
+def test(python, code):
+    func_name = 'successors'
+    tokens = get_tokens(code)
+    if not has_token_sequence(tokens, ['def', func_name]):
+        return False, [{'id' : 'no_func_name', 'args' : {'func_name' : func_name}}]
+
+    tree = {
+            'alice': ['mary', 'tom', 'judy'],
+            'bob': ['mary', 'tom', 'judy'],
+            'ken': ['suzan'],
+            'renee': ['rob', 'bob'],
+            'rob': ['jim'],
+            'sid': ['rob', 'bob'],
+            'tom': ['ken']}
+
+    in_out = [
+        ((tree, 'tom'), ['ken', 'suzan']),
+        ((tree, 'sid'), ['rob', 'bob', 'jim', 'mary',
+                         'tom', 'judy', 'ken', 'suzan']),
+        ((tree, 'suzan'), []),
+        ((tree, 'ken'), ['suzan']),
+        ((tree, 'rob'), ['jim']),
+]
+
+    test_in = [(func_name+'%s'%str(l[0]), None) for l in in_out]
+    test_out = [l[1] for l in in_out]
+
+    answers = python(code=code, inputs=test_in, timeout=1.0)
+    n_correct = 0
+    tin, tout = None, None
+    for i, (ans, to) in enumerate(zip(answers, test_out)):
+        corr = set(ans[0]) == set(to) and len(ans[0]) == len(to)
+        n_correct += corr
+        if not corr:
+            tin = test_in[i][0]
+            tout = to
+
+    passed = n_correct == len(test_in)
+    hints = [{'id': 'test_results', 'args': {'passed': n_correct, 'total': len(test_in)}}]
+    if tin:
+        hints.append({'id': 'problematic_test_case', 'args': {'testin': str(tin), 'testout': str(tout)}})
+    if passed:
+        hints.append({'id': 'final_hint'})
+    return passed, hints
+
+
+def hint(python, code):
+    tokens = get_tokens(code)
+
+    # run one test first to see if there are any exceptions
+    answer = python(code=code, inputs=[(None, None)], timeout=1.0)
+    exc = get_exception_desc(answer[0][3])
+    if exc: return exc
+
+    return None