8 kyu Check the exam.py

"""
https://www.codewars.com/kata/5a3dd29055519e23ec000074/train/python

The first input array is the key to the correct answers to an exam, like ["a", "a", "b", "d"]. The second one contains a student's submitted answers.

The two arrays are not empty and are the same length. Return the score for this array of answers, giving +4 for each correct answer, -1 for each incorrect answer, and +0 for each blank answer, represented as an empty string (in C the space character is used).

If the score < 0, return 0.

For example:

checkExam(["a", "a", "b", "b"], ["a", "c", "b", "d"]) → 6
checkExam(["a", "a", "c", "b"], ["a", "a", "b",  ""]) → 7
checkExam(["a", "a", "b", "c"], ["a", "a", "b", "c"]) → 16
checkExam(["b", "c", "b", "a"], ["",  "a", "a", "c"]) → 0
"""


def check_exam(arr1,arr2):
    score = 0
    
    for i,j in zip(arr1, arr2):
        if j == '':
            score += 0
        elif i == j:
            score += 4
        else:
            score -= 1
            
    if score < 0:
        return 0
    return score