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authorMartin <martin@leo.fri1.uni-lj.si>2015-09-15 16:58:40 +0200
committerMartin <martin@leo.fri1.uni-lj.si>2015-09-15 16:58:40 +0200
commit87a510e8c93ebdd9f535bf32450d385af87396de (patch)
treef9cf2d81ab420944f7ddcebddf211c3effd68859 /python/problems/introduction/average
parent59739438b954e3977263cd7df7869ac5539ca188 (diff)
Added a new problem: Average
Diffstat (limited to 'python/problems/introduction/average')
-rw-r--r--python/problems/introduction/average/common.py98
-rw-r--r--python/problems/introduction/average/en.py16
-rw-r--r--python/problems/introduction/average/sl.py90
3 files changed, 204 insertions, 0 deletions
diff --git a/python/problems/introduction/average/common.py b/python/problems/introduction/average/common.py
new file mode 100644
index 0000000..37d5315
--- /dev/null
+++ b/python/problems/introduction/average/common.py
@@ -0,0 +1,98 @@
+# coding=utf-8
+
+from python.util import has_token_sequence, string_almost_equal
+from server.hints import Hint, HintSequence
+
+id = 189
+group = 'introduction'
+number = 2
+visible = True
+
+solution = '''\
+a = float(input('Ocena [Ana]? '))
+b = float(input('Ocena [Benjamin]? '))
+c = float(input('Ocena [Cilka]? '))
+print('Povpre?je:', (a + b + c) / 3)
+print('Srednja vrednost:', a + b + c - min(a, b, c) - max( a, b, c))
+'''
+
+hint_type = {
+ 'plan': Hint('plan'),
+ 'eval_expression': Hint('eval_expression'),
+ 'name_error': HintSequence('name_error', 4),
+ 'unsupported_operand': HintSequence('unsupported_operand', 4),
+ 'error': HintSequence('error', 2),
+ 'radians': HintSequence('radians', 3),
+ 'printing': Hint('printing'),
+}
+
+
+
+def test(python, code):
+ # List of inputs: (expression to eval, stdin).
+ test_in = [
+ (None, '2\n4\n5\n'),
+ (None, '1\n1\n4\n'),
+ (None, '2\n5\n1\n'),
+ (None, '3\n1\n1\n'),
+ (None, '5\n1\n5\n'),
+ ]
+
+ test_out = [
+ [3.67, 4],
+ [2, 1],
+ [2.67, 2],
+ [1.67, 1],
+ [3.67, 5]
+ ]
+
+ # 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, c in zip(outputs, test_out):
+ if string_almost_equal(output, c[0]) and \
+ string_almost_equal(output, c[1]):
+ 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, '1\n1\n4\n')]
+ answer = python(code=code, inputs=test_in, timeout=1.0)
+ exc = answer[0][3]
+ # if have an exception!
+ if exc:
+ if 'NameError' in exc:
+ return [{'id':'name_error', 'args': {'message': exc}}]
+ elif 'TypeError' in exc:
+ return [{'id':'type_error', 'args': {'message': exc}}]
+ else:
+ return [{'id':'error', 'args': {'message': exc}}]
+
+ # show plan if student is lost
+ # a) empty progam
+ # b) there is not input (we can do it here, since we have no input hint)
+ if not code or (not has_token_sequence(code, ['input'])):
+ return [{'id': 'plan'}]
+
+ # Help to compute average (if /3 is not program)
+ if not has_token_sequence(code, ['/', '3']):
+ return [{'id': 'average'}]
+
+ # If student is not using functions min or max, then he is
+ # not computing median in the right way
+ if not has_token_sequence(code, ['min']) or \
+ not has_token_sequence(code, ['max']):
+ return [{'id': 'median'}]
+
+ # program is working correctly for mean but not for median
+ if '2' in answer[0][1] and '1' not in answer[0][1]:
+ return [{'id': 'median'}]
+
+ # student is not using print function
+ if not has_token_sequence(code, ['print']):
+ return [{'id' : 'printing'}]
+
+ return None
diff --git a/python/problems/introduction/average/en.py b/python/problems/introduction/average/en.py
new file mode 100644
index 0000000..72e83aa
--- /dev/null
+++ b/python/problems/introduction/average/en.py
@@ -0,0 +1,16 @@
+# coding=utf-8
+
+id = 1000
+name = 'Pythagorean theorem'
+slug = 'Pythagorean theorem'
+
+description = '''\
+<p>(translation missing)'''
+
+hint = {
+ 'plan': '''\
+<p>(translation missing)</p>''',
+
+ 'no_input_call': '''\
+<p>(translation missing)</p>''',
+}
diff --git a/python/problems/introduction/average/sl.py b/python/problems/introduction/average/sl.py
new file mode 100644
index 0000000..2824320
--- /dev/null
+++ b/python/problems/introduction/average/sl.py
@@ -0,0 +1,90 @@
+# coding=utf-8
+
+id = 189
+name = 'Povprečna ocena'
+slug = 'Povprečna ocena'
+
+description = '''\
+<p>Napiši program, ki mu uporabnik vpiše oceno, ki so jo pri matematiki dobili Ana, Benjamin in Cilka.
+Program naj izračuna in izpiše povprečno oceno ter srednjo vrednost. Sprogramiraj slednjo brez
+uporabe pogojnih stavkov ali česa podobno "naprednega". Konkretno, uporabljaj le funkcije input,
+print, min in max. Namig: min in max lahko prejmeta poljubno število argumentov. Pomisli tudi na
+to, da imaš samo tri osebe; pri štirih ta trik ne bi vžgal. Primer izvajanja programa:</p>
+<pre>
+Ocena [Ana]? 2
+Ocena [Benjamin]? 4
+Ocena [Cilka]? 5
+Povpreče: 3.6666666666666665
+Srednja vrednost: 4.0
+</pre>
+'''
+
+general_exception = {
+ 'error_head' : '''\
+<p>Napaka:</p>
+<pre>
+[%=message%]
+</pre>
+''',
+
+ 'general': '''
+ <p>Pri razumevanju napake sta pomembni dve vrstici. V predzadnji vrstici je napisana lokacija
+ napake (line ...), v zadnji vrstici pa izvemo za kakšno napako gre.</p>
+ ''',
+
+ 'name_error' : '''
+ <p>Napaka <code>NameError</code> pomeni, da uporabljate nedefinirano vrednost:
+ ali vrednost spremenljivke ni določena ali uporabljate funkcijo, ki ni uvožena.</p>
+ ''',
+
+ 'type_error': '''
+ <p>TypeError napaka pomeni, da želite izvesti operacijo na nedovoljenih tipih.
+ Npr., če želite sešteti niz in število ali klicati funkcijo, čeprav tisto ni funkcija, itd. .</p>
+ ''',
+}
+
+hint = {
+ 'plan': '''\
+<p>Ista strategija kot pri predhodnih nalogah: 1) preberi ocene Ane, Benjamina in Cilke, 2) izračunaj
+povprečno vrednost in srednjo vrednost ter 3) izpiši.</p>
+''',
+
+ 'average': '''
+<p>Povprečje izračunamo kot vsoto vseh elementov, ki jo delimo s številom elementov. Konkretno v
+našem primeru:</p>
+<pre>
+p = (a + b + c) / 3
+</pre>
+''',
+
+ 'median': '''
+<p>Če imamo samo 3 vrednosti in odstranimo najmanjšo in največjo vrednost, nam ostane srednja
+vrednost. V programu to najlažje izvedemo tako, da vrednosti seštejemo in potem vsoti odštejemo
+najmanjšo in največjo vrednost.</p>
+''',
+
+ 'printing': '''
+<p> V Pythonu izpisujemo s funkcijo <code>print. Če želimo izpisati več elementov,
+jih ločimo z vejico. Recimo, da imamo spremenljivko <code>ime</code>,
+ki vsebuje naše ime, potem lahko napišemo:
+<pre>
+print("Ime mi je", ime, ".")
+</pre>''',
+
+ 'name_error' : [general_exception['error_head'], general_exception['general'],
+ general_exception['name_error'], '''
+ <p>Verjetno uporabljate spremenljivko, ki nima vrednosti. Ali v izrazu za izračun
+ uporabljate napačno spremenljivko? Ali pri izpisu morda poskušate
+ izpisati napačno spremenljivko?</p>'''],
+
+ 'type_error' : [general_exception['error_head'], general_exception['general'],
+ general_exception['type_error'], '''
+<p>Verjetni razlog: funkcija <code>input</code> vrača vrednost tipa niz,
+ki jo moramo najprej pretvoriti v tip <code>float</code>, če želimo z njo računati:</p>
+<pre>
+v = float(input(" ...
+</pre>
+'''],
+
+ 'error' : [general_exception['error_head'], general_exception['general'],]
+}