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MCQ Validator and Scorer
"""
from typing import List, Dict
class MCQValidator:
@staticmethod
def validate_mcq(mcq: Dict) -> bool:
"""
Validate if MCQ has all required fields
Args:
mcq: MCQ dictionary
Returns:
True if valid, False otherwise
"""
required_fields = ['question', 'options', 'correct_answer']
# Check required fields
if not all(field in mcq for field in required_fields):
return False
# Check options
if not isinstance(mcq['options'], dict):
return False
if len(mcq['options']) < 2:
return False
# Check correct answer
if mcq['correct_answer'] not in mcq['options']:
return False
return True
@staticmethod
def score_answers(
mcqs: List[Dict],
user_answers: Dict[int, str]
) -> Dict:
"""
Score user answers
Args:
mcqs: List of MCQs
user_answers: Dict mapping question index to user's answer
Returns:
Scoring result dictionary
"""
total_questions = len(mcqs)
correct_count = 0
results = []
for i, mcq in enumerate(mcqs):
user_answer = user_answers.get(i)
correct_answer = mcq['correct_answer']
is_correct = user_answer == correct_answer
if is_correct:
correct_count += 1
results.append({
'question_index': i,
'question': mcq['question'],
'user_answer': user_answer,
'correct_answer': correct_answer,
'is_correct': is_correct,
'explanation': mcq.get('explanation', '')
})
score_percentage = (correct_count / total_questions * 100) if total_questions > 0 else 0
return {
'total_questions': total_questions,
'correct_answers': correct_count,
'incorrect_answers': total_questions - correct_count,
'score_percentage': round(score_percentage, 2),
'grade': MCQValidator._calculate_grade(score_percentage),
'results': results
}
@staticmethod
def _calculate_grade(score: float) -> str:
"""Calculate letter grade from score"""
if score >= 90:
return 'A+'
elif score >= 80:
return 'A'
elif score >= 70:
return 'B'
elif score >= 60:
return 'C'
elif score >= 50:
return 'D'
else:
return 'F'
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