From 59739438b954e3977263cd7df7869ac5539ca188 Mon Sep 17 00:00:00 2001 From: Martin Date: Tue, 15 Sep 2015 16:39:36 +0200 Subject: Added a new Python problem: ballistics --- python/problems/introduction/ballistics/common.py | 138 +++++++++++++++++++++ python/problems/introduction/ballistics/en.py | 16 +++ python/problems/introduction/ballistics/sl.py | 124 ++++++++++++++++++ .../introduction/pythagorean_theorem/common.py | 4 +- .../introduction/pythagorean_theorem/sl.py | 2 +- 5 files changed, 281 insertions(+), 3 deletions(-) create mode 100644 python/problems/introduction/ballistics/common.py create mode 100644 python/problems/introduction/ballistics/en.py create mode 100644 python/problems/introduction/ballistics/sl.py diff --git a/python/problems/introduction/ballistics/common.py b/python/problems/introduction/ballistics/common.py new file mode 100644 index 0000000..1a75493 --- /dev/null +++ b/python/problems/introduction/ballistics/common.py @@ -0,0 +1,138 @@ +# coding=utf-8 + +from python.util import has_token_sequence, string_almost_equal +from server.hints import Hint, HintSequence + +id = 187 +group = 'introduction' +number = 2 +visible = True + +solution = '''\ +from math import * +g = 9.8 +kot = float(input("Vnesi kot (v stopinjah): ")) +v = float(input("Vnesi hitrost (v m/s): ")) +kot_rad = kot * 2 * pi / 360 +razdalja = v ** 2 * sin(2 * kot_rad) / g +print("Kroglo bo odneslo", razdalja, "metrov.") +''' + +hint_type = { + 'plan': Hint('plan'), + 'eval_expression': Hint('eval_expression'), + 'sin_error': HintSequence('sin_error', 4), + 'name_error': HintSequence('name_error', 4), + 'unsupported_operand': HintSequence('unsupported_operand', 4), + 'error': HintSequence('error', 2), + 'radians': HintSequence('radians', 3), + 'printing': Hint('printing'), + 'betterg': Hint('betterg'), +} + +import re +numeric_const_pattern = r""" + [-+]? # optional sign + (?: + (?: \d* \. \d+ ) # .1 .12 .123 etc 9.1 etc 98.1 etc + | + (?: \d+ \.? ) # 1. 12. 123. etc 1 12 123 etc + ) + # followed by optional exponent part if desired + (?: [Ee] [+-]? \d+ ) ? + """ +rx = re.compile(numeric_const_pattern, re.VERBOSE) + +def contains_negative(s): + """ Returns whether the string contains negative value or not. + """ + vals = rx.findall(s) + for v in vals: + if float(v) < 0: + return True + return False + +def test(python, code): + # List of inputs: (expression to eval, stdin). + test_in = [ + (None, '45\n100\n'), + (None, '44\n100\n'), + (None, '46\n100\n'), + (None, '0\n100\n'), + (None, '90\n100\n'), + (None, '32\n747\n'), + (None, '45\n10\n'), + (None, '40\n10\n'), + (None, '10\n10\n'), + (None, '80\n10\n'), + (None, '80\n20\n'), + (None, '80\n0\n') + ] + + test_out = [ + '1020.4', + '1019.79', + '1019.79', + '0.0', + '0.0', + '51177.06', + '10.20', + '10.05', + '3.49', + '3.49', + '13.94', + '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, float(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\n10\n')] + answer = python(code=code, inputs=test_in, timeout=1.0) + exc = answer[0][3] + # if have an exception! + if exc: + if 'sin' in exc and 'NameError' in exc: + return [{'id':'sin_error', 'args': {'message': exc}}] + elif 'NameError' in exc: + return [{'id':'name_error', 'args': {'message': exc}}] + elif 'unsupported operand' in exc: + return [{'id':'unsupported_operand', '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'}] + + # if sinus is not in code, we need to teach students where they can get it + # use math functions. + if (not has_token_sequence(code, ['sin'])): + return [{'id' : 'eval_expression'}] + + # student is not using print function + if not has_token_sequence(code, ['print']): + return [{'id' : 'printing'}] + + # if result is negative, student did not translate to radians + if contains_negative(answer[0][1]): + return [{'id': 'radians'}] + + # using g=10 + if string_almost_equal(answer[0][1], 1.736, prec=2): + return [{'id': 'betterg'}] + + return None diff --git a/python/problems/introduction/ballistics/en.py b/python/problems/introduction/ballistics/en.py new file mode 100644 index 0000000..72e83aa --- /dev/null +++ b/python/problems/introduction/ballistics/en.py @@ -0,0 +1,16 @@ +# coding=utf-8 + +id = 1000 +name = 'Pythagorean theorem' +slug = 'Pythagorean theorem' + +description = '''\ +

(translation missing)''' + +hint = { + 'plan': '''\ +

(translation missing)

''', + + 'no_input_call': '''\ +

(translation missing)

''', +} diff --git a/python/problems/introduction/ballistics/sl.py b/python/problems/introduction/ballistics/sl.py new file mode 100644 index 0000000..9150444 --- /dev/null +++ b/python/problems/introduction/ballistics/sl.py @@ -0,0 +1,124 @@ +# coding=utf-8 + +id = 187 +name = 'Topologija' +slug = 'Topologija' + +description = '''\ +

Napiši program za izračun dolžine strela s topom (ki brez trenja izstreljuje +točkaste krogle v brezzračnem prostoru, a pustimo trivio). Program od uporabnika +ali uporabnice zahteva, da vnese hitrost izstrelka (to je, omenjene točkaste krogle) +in kot, pod katerim je izstreljen. Program naj izračuna in izpiše, kako daleč +bo letela krogla.

+

Pomoč za fizično nebogljene: s=v2sin(2f)/g , kjer je s razdalja, +v hitrost izstrelka, f je kot, g pa osma črka slovenske abecede.

+

Preveri tole: krogla leti najdalj, če jo izstrelimo pod kotom 45 stopinj. +Poskusi, kako daleč gre pod kotom 45 in kako daleč pod 46 stopinj -- po 45 mora leteti dlje. +Preveri tudi kot 50 stopinj: če pod tem kotom leti nazaj (razdalja je negativna), +si ga gotovo nekje polomil. +''' + +general_exception = { + 'error_head' : '''\ +

Napaka:

+
+[%=message%]
+
+''', + + 'general': ''' +

Pri razumevanju napake sta pomembni dve vrstici. V predzadnji vrstici je napisana lokacija + napake (line ...), v zadnji vrstici pa izvemo za kakšno napako gre.

+ ''', + + 'name_error' : ''' +

Napaka tipa NameError označuje, da uporabljate nedefinirano vrednost:

+