Added problem "Competition"

Revised problem "Buy five"

1 files changed, 84 insertions, 0 deletions

diff --git a/python/problems/while_and_if/competition/common.py b/python/problems/while_and_if/competition/common.py
new file mode 100644
index 0000000..79f7447
--- /dev/null
+++ b/python/problems/while_and_if/competition/common.py
@@ -0,0 +1,84 @@
+# coding=utf-8
+
+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, HintSequence
+
+id = 192
+group = 'while_and_if'
+number = 2
+visible = True
+
+solution = '''\
+vsota = 0
+i = int(input('Število izdelkov: '))
+while i > 0:
+    vsota += int(input('Cena artikla: '))
+    i -= 1
+print('Vsota:', vsota)
+'''
+
+hint_type = {
+    'plan': HintSequence('plan', 1),
+}
+
+def test(python, code):
+    # List of inputs: (expression to eval, stdin).
+    test_in = [
+        (None, '3\n2\n4\n1\n'),
+        (None, '3\n1\n1\n1\n'),
+        (None, '4\n2\n0\n3\n-1\n'),
+        (None, '7\n1\n2\n5\n4\n3\n11\n7\n'),
+        (None, '5\n0\n0\n0\n0\n0\n'),
+    ]
+
+    test_out = [
+        7,
+        3,
+        4,
+        33,
+        0,
+    ]
+
+    # List of outputs: (expression result, stdout, stderr, exception).
+    answers = python(code=code, inputs=test_in, timeout=1.0)
+    outputs = [ans[1] for ans in answers]
+
+    n_correct = 0
+    for output, correct in zip(outputs, test_out):
+        if string_almost_equal(output, correct):
+            n_correct += 1
+    return n_correct, len(test_in)
+
+def hint(python, code):
+    # run one test first to see if there are any exceptions
+    test_in = [(None, '5\n1\n1\n1\n1\n1\n')]
+    answer = python(code=code, inputs=test_in, timeout=1.0)
+    exc = get_exception_desc(answer)
+    if exc: return exc
+
+    tokens = get_tokens(code)
+
+    # if has not input, tell him to ask for values
+    if not has_token_sequence(tokens, ['input']):
+        return [{'id' : 'read_before_while'}]
+
+    # student does not have while or for: instruct him on loops
+    if not has_token_sequence(tokens, ['while']) and \
+       not has_token_sequence(tokens, ['for']):
+        return [{'id' : 'while_clause'}]
+
+    # student is not using print function
+    if not has_token_sequence(tokens, ['print']):
+        return [{'id' : 'printing'}]
+
+    # student does not know how to accumulate values (print contains 0 or 1)
+    if string_contains_number(answer[0][1], 0) or \
+       string_contains_number(answer[0][1], 1):
+        return [{'id' : 'summation'}]
+
+    # student does not print any values
+    if not get_numbers(answer[0][1]):
+        return [{'id' : 'nonumber'}]
+
+    return None