1 files changed, 67 insertions, 0 deletions
diff --git a/python/problems/dictionaries/show_letters/common.py b/python/problems/dictionaries/show_letters/common.py
new file mode 100644
index 0000000..f69565a
--- /dev/null
+++ b/python/problems/dictionaries/show_letters/common.py
@@ -0,0 +1,67 @@
+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 = 20602
+number = 1
+visible = True
+
+solution = '''\
+def show_letters(word, letters):
+    bes = ""
+    for c in word:
+        bes += c if c in letters else "."
+    return bes
+'''
+
+hint_type = {
+    'final_hint': Hint('final_hint')
+}
+
+def test(python, code):
+    func_name = 'show_letters'
+    tokens = get_tokens(code)
+    if not has_token_sequence(tokens, ['def', func_name]):
+        return False, [{'id' : 'no_func_name', 'args' : {'func_name' : func_name}}]
+
+    in_out = [
+        (('PONUDNIK', set(['O', 'N'])), '.ON..N..'),
+        (('PONUDNIK', set(['O', 'I', 'K'])), '.O....IK'),
+        (('PONUDNIK', set()), '........'),
+        (('PONUDNIK', set(['P', 'O', 'N', 'I', 'K', 'U'])), 'PONU.NIK'),
+        (('PONUDNIK', set(['P', 'O', 'N', 'I', 'K', 'U', 'D', 'Z'])), 'PONUDNIK'),
+        (('PONUDNIK', set(['A', 'B', 'J', 'L'])), '........'),
+        (('', set(['A', 'B', 'J', 'L'])), '')
+    ]
+
+    test_in = [('{0}{1}'.format(func_name, 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)):
+        n_correct += ans[0] == to
+        if ans[0] != to:
+            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