def percent_ok(log_filename):
    total_reguest = 0
    successfull_reguest = 0
    try:
        with open(log_filename,'r',encoding='utf-8') as f:
            for line in f:
                if not line.strip():
                    continue

                total_reguest+=1
                status = line.strip().split('|')[-1].split(':')[-1].strip()

                if status == '200':
                    successfull_reguest+=1

        if total_reguest == 0:
            return 0.0

        result=(successfull_reguest / total_reguest)*100
        return round(result,1)
    except FileNotFoundError:
        return f'Файл не найден'