1 files changed, 91 insertions, 0 deletions
diff --git a/python/problems/introduction-fkkt/molar_mass/common.py b/python/problems/introduction-fkkt/molar_mass/common.py
new file mode 100644
index 0000000..10aa098
--- /dev/null
+++ b/python/problems/introduction-fkkt/molar_mass/common.py
@@ -0,0 +1,91 @@
+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 = 25004
+number = 5
+visible = True
+
+solution = '''\
+hidracija = int(input('Stopnja hidracije: '))
+
+Cu = 63.5
+S = 32.1
+O = 16.0
+H = 1.0
+mm = Cu + S + 4 * O + hidracija * (2 * H + O)
+
+print('Molska masa je', mm, 'g/mol.')
+'''
+
+hint_type = {
+    'plan': Hint('plan'),
+    'name_error': Hint('name_error'),
+    'unsupported_operand': Hint('unsupported_operand'),
+    'no_input_call' : Hint('no_input_call'),
+    'printing': Hint('printing'),
+    'final_hint': Hint('final_hint')
+}
+
+def test(python, code, aux_code=''):
+    # List of inputs: (expression to eval, stdin).
+    test_in = [
+        (None, '1'),
+        (None, '2'),
+        (None, '5')
+    ]
+
+    test_out = [
+        "Molska masa je 177.6 g/mol",
+        "Molska masa je 195.6 g/mol",
+        "Molska masa je 249.6 g/mol",
+    ]
+
+    # List of outputs: (expression result, stdout, stderr, exception).
+    answers = python(code=aux_code+code, inputs=test_in, timeout=1.0)
+    outputs = [ans[1] for ans in answers]
+
+    n_correct = 0
+    tin = None
+    for i, (output, correct) in enumerate(zip(outputs, test_out)):
+        #if string_almost_equal(output, float(correct), prec=2):
+        if output.rstrip().endswith(correct):
+            n_correct += 1
+        else:
+            tin = test_in[i][1]
+            tout = correct
+
+    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, aux_code=''):
+    tokens = get_tokens(code)
+
+    # run one test first to see if there are any exceptions
+    test_in = [(None, '1\n')]
+    answer = python(code=aux_code+code, inputs=test_in, timeout=1.0)
+    exc = answer[0][3]
+    exc_hint = get_exception_desc(answer[0][3])
+    if exc:
+        if 'NameError' in exc:
+            return [{'id':'name_error', 'args': {'message': exc}}]
+        elif 'unsupported operand' in exc or 'TypeError' in exc:
+            return [{'id':'unsupported_operand', 'args': {'message': exc}}]
+        else:
+            return exc_hint
+
+    # if input is not present in code, student needs to learn about input
+    if not has_token_sequence(tokens, ['input']) or \
+       (not has_token_sequence(tokens, ['float']) and not has_token_sequence(tokens, ['int'])) or \
+       not has_token_sequence(tokens, ['=']):
+        return [{'id': 'no_input_call'}]
+
+    if not has_token_sequence(tokens, ['print']):
+        return [{'id' : 'printing'}]
+
+    return None