1 files changed, 89 insertions, 0 deletions
diff --git a/python/problems/lists_and_if-fkkt/square_equation/common.py b/python/problems/lists_and_if-fkkt/square_equation/common.py
new file mode 100644
index 0000000..45e0f02
--- /dev/null
+++ b/python/problems/lists_and_if-fkkt/square_equation/common.py
@@ -0,0 +1,89 @@
+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 = 25012
+number = 8
+visible = True
+
+solution = '''\
+a = int(input('Vpiši a: '))
+b = int(input('Vpiši b: '))
+c = int(input('Vpiši c: '))
+
+d = b**2 - 4 * a * c
+if d < 0:
+    print('Enačba nima realnih rešitev.')
+elif d == 0:
+    x = -b / (2 * a)
+    print('Enačba ima eno realno rešitev:', x)
+else:
+    x1 = (-b + pow(d, 1/2)) / (2 * a)
+    x2 = (-b - pow(d, 1/2)) / (2 * a)
+    print('Enačba ima dve realni rešitvi:', x1, 'in', x2)
+'''
+
+hint_type = {
+    'if_clause': Hint('if_clause'),
+    'printing': Hint('printing'),
+    'no_input_call' : Hint('no_input_call'),
+    'final_hint': Hint('final_hint')
+}
+
+def test(python, code, aux_code=''):
+    tokens = get_tokens(code)
+
+    test_in = [
+        (None, '1\n2\n1\n'),
+        (None, '1\n2\n0\n'),
+        (None, '1\n2\n2\n')
+    ]
+    test_out = [
+        'Enačba ima eno realno rešitev: -1.0',
+        'Enačba ima dve realni rešitvi: 0.0 in -2.0',
+        'Enačba nima realnih rešitev.'
+    ]
+
+    # 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 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 != None:
+        hints.append({'id': 'problematic_test_case', 'args': {'testin': str(tin), 'testout': str(tout)}})
+    else:
+        hints.append({'id' : 'final_hint'})
+    return passed, hints
+
+def hint(python, code, aux_code=''):
+    # run one test first to see if there are any exceptions
+    test_in = [(None, '1\n2\n1\n')]
+    answer = python(code=aux_code+code, inputs=test_in, timeout=1.0)
+    exc = get_exception_desc(answer[0][3])
+    if exc: return exc
+
+    tokens = get_tokens(code)
+
+    # if input is not present in code, student needs to learn about input
+    if not has_token_sequence(tokens, ['input']):
+        return [{'id': 'no_input_call'}]
+
+    if not has_token_sequence(tokens, ['if']):
+        return [{'id' : 'if_clause'}]
+
+    # student is not using print function
+    if not has_token_sequence(tokens, ['print']):
+        return [{'id' : 'printing'}]
+
+    return None