คุณสมบัติของโปรแกรม · คำใบ้สำหรับตัวอักษรซ้ำ

from collections import Counter

def letter_feedback(answer, guess):
    if any(type(s) is not str or len(s) != 5 or any(not "a" <= c <= "z" for c in s) for s in (answer, guess)):
        raise ValueError("word.lowercase")
    marks, remaining = [0] * 5, Counter()
    for i, (a, g) in enumerate(zip(answer, guess)):
        if a == g:
            marks[i] = 2
        else:
            remaining[a] += 1
    for i, g in enumerate(guess):
        if marks[i] != 2 and remaining[g]:
            marks[i] = 1
            remaining[g] -= 1
    return marks