From fc34673e84ea9bc823e8530c7564f0caa6a99000 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Mo=C5=BEina?= <martin.mozina@fri.uni-lj.si>
Date: Tue, 27 Sep 2016 16:38:23 +0200
Subject: Added exercises with list comprehensions.
---
python/problems/comprehensions/std/common.py | 78 ++++++++++++++++++++++++++++
python/problems/comprehensions/std/en.py | 13 +++++
python/problems/comprehensions/std/sl.py | 41 +++++++++++++++
3 files changed, 132 insertions(+)
create mode 100644 python/problems/comprehensions/std/common.py
create mode 100644 python/problems/comprehensions/std/en.py
create mode 100644 python/problems/comprehensions/std/sl.py
(limited to 'python/problems/comprehensions/std')
diff --git a/python/problems/comprehensions/std/common.py b/python/problems/comprehensions/std/common.py
new file mode 100644
index 0000000..05c7357
--- /dev/null
+++ b/python/problems/comprehensions/std/common.py
@@ -0,0 +1,78 @@
+import re
+from python.util import has_token_sequence, string_almost_equal, \
+ string_contains_number, get_tokens, get_numbers, get_exception_desc, \
+ all_tokens, has_comprehension, has_loop, almost_equal, get_ast
+from server.hints import Hint
+
+id = 20704
+number = 4
+visible = True
+
+solution = '''\
+def mean(xs):
+ return sum(xs) / len(xs)
+
+def std(xs):
+ a = mean(xs)
+ return math.sqrt(sum((x - a)**2 for x in xs) / len(xs))
+'''
+
+hint_type = {
+ 'final_hint': Hint('final_hint'),
+ 'no_comprehension': Hint('no_comprehension'),
+ 'has_loop': Hint('has_loop')
+}
+
+def test(python, code):
+ func_name = 'std'
+ tokens = get_tokens(code)
+ ast = get_ast(code)
+ if not has_token_sequence(tokens, ['def', func_name]):
+ return False, [{'id' : 'no_func_name', 'args' : {'func_name' : func_name}}]
+
+ in_out = [
+ ([183, 168, 175, 176, 192, 180], 7.43863786814),
+ ([83, 68, 75, 76, 92, 80], 7.43863786814),
+ ([1, 1, 1], 0),
+ ([1], 0),
+ ([-3, 3], 3)
+ ]
+
+ 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)):
+ corr = isinstance(ans[0], float) and almost_equal(ans[0], to, 3)
+ n_correct += corr
+ if not corr:
+ 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:
+ if not has_comprehension(ast):
+ hints.append({'id': 'no_comprehension'})
+ elif has_loop(ast):
+ hints.append({'id': 'has_loop'})
+ else:
+ 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
diff --git a/python/problems/comprehensions/std/en.py b/python/problems/comprehensions/std/en.py
new file mode 100644
index 0000000..8599da8
--- /dev/null
+++ b/python/problems/comprehensions/std/en.py
@@ -0,0 +1,13 @@
+id = 20704
+name = 'Standard deviation'
+
+description = '''\
+<p>(translation missing)</p>'''
+
+hint = {
+ 'plan': '''\
+<p>(translation missing)</p>''',
+
+ 'no_input_call': '''\
+<p>(translation missing)</p>''',
+}
diff --git a/python/problems/comprehensions/std/sl.py b/python/problems/comprehensions/std/sl.py
new file mode 100644
index 0000000..ae6e0af
--- /dev/null
+++ b/python/problems/comprehensions/std/sl.py
@@ -0,0 +1,41 @@
+import server
+mod = server.problems.load_language('python', 'sl')
+
+
+id = 20704
+name = 'Standardni odklon'
+
+description = '''\
+<p>
+Napišite funkcijo <code>std(xs)</code>, ki izračuna
+standardni odklon populacije <code>xs</code>. Formulo za standardno deviacijo je
+\[ \sigma = \sqrt{ \\frac{1}{N}\sum_{i=1}^{N} \left(x_i - \mu \\right)^2} \],
+Vrednost \( \mu \) je povprečna vrednost populacije.
+</p>
+<pre>
+>>> xs = [183, 168, 175, 176, 192, 180]
+>>> std(xs)
+7.43863786814
+</pre>
+'''
+
+plan = []
+
+hint = {
+ 'final_hint': ['''\
+<p>Program je pravilen! <br>
+</p>
+'''],
+
+ 'no_comprehension': ['''\
+<p>Program je sicer pravilen, vendar ne vsebuje izpeljanih seznamov ali
+generatorjev...
+</p>
+'''],
+
+ 'has_loop': ['''\
+<p>Program je sicer pravilen, vendar vsebuje zanko.
+</p>
+'''],
+
+}
--
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