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import random
import sys
import traceback
import string
from django.db import IntegrityError
from django.contrib.auth.models import User
from django.contrib.auth import login, logout, authenticate
from django.shortcuts import render_to_response, get_object_or_404, redirect
from django.template import RequestContext
from exam.models import Question, Quiz, Profile, Answer
from exam.forms import UserRegisterForm
def gen_key(no_of_chars):
"""Generate a random key of the number of characters."""
allowed_chars = string.digits+string.uppercase
return ''.join([random.choice(allowed_chars) for i in range(no_of_chars)])
def index(request):
"""The start page.
"""
# Largely copied from Nishanth's quiz app.
user = request.user
if user.is_authenticated():
return redirect("/exam/start/")
if request.method == "POST":
form = UserRegisterForm(request.POST)
if form.is_valid():
data = form.cleaned_data
while True:
try:
username = gen_key(20)
new_user = User.objects.create_user(username, "temp@temp.com", "123")
break
except IntegrityError:
pass
new_user.first_name = data['first_name']
new_user.last_name = data['last_name']
new_user.save()
new_profile = Profile(user=new_user)
new_profile.roll_number = data['roll_number']
new_profile.save()
user = authenticate(username=username, password="123")
login(request, user)
return redirect("/exam/start/")
else:
return render_to_response('exam/register.html',{'form':form},
context_instance=RequestContext(request))
else:
form = UserRegisterForm()
return render_to_response('exam/register.html',{'form':form},
context_instance=RequestContext(request))
def show_question(request, q_id):
"""Show a question if possible."""
if len(q_id) == 0:
return redirect("/exam/complete")
else:
return question(request, q_id)
def start(request):
user = request.user
try:
old_quiz = Quiz.objects.get(user=user)
q = old_quiz.current_question()
return redirect('/exam/%s'%q)
except Quiz.DoesNotExist:
ip = request.META['REMOTE_ADDR']
key = gen_key(10)
new_quiz = Quiz(user=user, user_ip=ip, key=key)
questions = [ str(_.id) for _ in Question.objects.all() ]
random.shuffle(questions)
questions = questions[:3]
new_quiz.questions = "|".join(questions)
new_quiz.save()
q = new_quiz.current_question()
return show_question(request, q)
def question(request, q_id):
q = get_object_or_404(Question, pk=q_id)
try:
quiz = Quiz.objects.get(user=request.user)
except Quiz.DoesNotExist:
redirect('/exam/start')
context = {'question': q, 'quiz': quiz}
ci = RequestContext(request)
return render_to_response('exam/question.html', context,
context_instance=ci)
def test_python(answer, test_code):
"""Tests given Python function with the test code supplied.
Returns
-------
A tuple: (success, error message).
"""
success = False
tb = None
try:
submitted = compile(answer, '<string>', mode='exec')
g = {}
exec submitted in g
_tests = compile(test_code, '<string>', mode='exec')
exec _tests in g
except AssertionError:
type, value, tb = sys.exc_info()
info = traceback.extract_tb(tb)
fname, lineno, func, text = info[-1]
text = str(test_code).splitlines()[lineno-1]
err = "{0} {1} in: {2}".format(type.__name__, str(value), text)
except:
type, value = sys.exc_info()[:2]
err = "Error: {0}".format(repr(value))
else:
success = True
err = 'Correct answer'
finally:
del tb
return success, err
def check(request, q_id):
user = request.user
question = get_object_or_404(Question, pk=q_id)
quiz = Quiz.objects.get(user=user)
answer = request.POST.get('answer')
skip = request.POST.get('skip', None)
if skip is not None:
next_q = quiz.skip()
return show_question(request, next_q)
# Otherwise we were asked to check.
success, err_msg = test_python(answer, question.test)
# Add the answer submitted.
new_answer = Answer(question=question, answer=answer.strip())
new_answer.correct = success
new_answer.save()
quiz.answers.add(new_answer)
ci = RequestContext(request)
if not success:
context = {'question': question, 'error_message': err_msg,
'last_attempt': answer}
return render_to_response('exam/question.html', context,
context_instance=ci)
else:
next_q = quiz.answered_question(question.id)
return show_question(request, next_q)
def quit(request):
return render_to_response('exam/quit.html',
context_instance=RequestContext(request))
def complete(request):
yes = True
if request.method == 'POST':
yes = request.POST.get('yes', None)
if yes:
logout(request)
return render_to_response('exam/complete.html')
else:
return redirect('/exam/')
def monitor(request):
"""Monitor the progress of the quizzes taken so far."""
quizzes = Quiz.objects.all()
questions = Question.objects.all()
# Mapping from question id to points
marks = dict( ( (q.id, q.points) for q in questions) )
quiz_list = []
for quiz in quizzes:
paper = {}
user = quiz.user
paper['username'] = str(user.first_name) + ' ' + str(user.last_name)
paper['rollno'] = str(Profile.objects.get(user=user).roll_number)
qa = quiz.questions_answered.split('|')
answered = ', '.join(sorted(qa))
paper['answered'] = answered if answered else 'None'
total = sum( [marks[int(id)] for id in qa if id] )
paper['total'] = total
quiz_list.append(paper)
quiz_list.sort(cmp=lambda x, y: cmp(x['total'], y['total']),
reverse=True)
context = {'quiz_list': quiz_list}
return render_to_response('exam/monitor.html', context,
context_instance=RequestContext(request))
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