Added several new problems.

They have no tests nor hints implemented.

1 files changed, 50 insertions, 0 deletions

diff --git a/python/problems/lists_and_for/every_third/common.py b/python/problems/lists_and_for/every_third/common.py
new file mode 100644
index 0000000..9c27446
--- /dev/null
+++ b/python/problems/lists_and_for/every_third/common.py
@@ -0,0 +1,50 @@
+# coding=utf-8
+
+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 = 220
+group = 'lists_and_for'
+number = 6
+visible = True
+
+solution = '''\
+xs = [42, 5, 4, -7, 2, 12, -3, -4, 11, 42, 2]
+
+ys = []
+i = 2
+while i < len(xs):
+    ys.append(xs[i])
+    i += 3
+print(ys)
+'''
+
+hint_type = {
+    'final_hint': Hint('final_hint')
+}
+
+def test(python, code):
+    test_in = [1]
+    n_correct = 0
+
+    passed = n_correct == len(test_in)
+    tin = None
+    tout = None
+    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