Python TypeError: объект типа NoneType не имеет решения len ()

–ú–µ—Ç–æ–¥ len () —Ä–∞–±–æ—Ç–∞–µ—Ç —Ç–æ–ª—å–∫–æ —Å –ø–æ–≤—Ç–æ—Ä—è–µ–º—ã–º–∏ –æ–±—ä–µ–∫—Ç–∞–º–∏, —Ç–∞–∫–∏–º–∏ –∫–∞–∫ —Å—Ç—Ä–æ–∫–∏, —Å–ø–∏—Å–∫–∏ –∏ —Å–ª–æ–≤–∞—Ä–∏. –≠—Ç–æ –ø–æ—Ç–æ–º—É, —á—Ç–æ –∏—Ç–µ—Ä–∏—Ä—É–µ–º—ã–µ –æ–±—ä–µ–∫—Ç—ã —Å–æ–¥–µ—Ä–∂–∞—Ç –ø–æ—Å–ª–µ–¥–æ–≤–∞—Ç–µ–ª—å–Ω–æ—Å—Ç–∏ –∑–Ω–∞—á–µ–Ω–∏–π. –ï—Å–ª–∏ –≤—ã –ø–æ–ø—ã—Ç–∞–µ—Ç–µ—Å—å –∏—Å–ø–æ–ª—å–∑–æ–≤–∞—Ç—å –º–µ—Ç–æ–¥ len () –¥–ª—è –∑–Ω–∞—á–µ–Ω–∏—è None, –≤—ã —Å—Ç–æ–ª–∫–Ω–µ—Ç–µ—Å—å —Å –æ—à–∏–±–∫–æ–π " TypeError: –æ–±—ä–µ–∫—Ç —Ç–∏–ø–∞ " NoneType " –Ω–µ –∏–º–µ–µ—Ç len () & rdquo ;.

–í —ç—Ç–æ–º —Ä—É–∫–æ–≤–æ–¥—Å—Ç–≤–µ –º—ã –ø–æ–≥–æ–≤–æ—Ä–∏–º –æ —Ç–æ–º, —á—Ç–æ –æ–∑–Ω–∞—á–∞–µ—Ç —ç—Ç–∞ –æ—à–∏–±–∫–∞ –∏ –∫–∞–∫ –æ–Ω–∞ —Ä–∞–±–æ—Ç–∞–µ—Ç. –ú—ã —Ä–∞—Å—Å–º–æ—Ç—Ä–∏–º –¥–≤–∞ –ø—Ä–∏–º–µ—Ä–∞ —ç—Ç–æ–π –æ—à–∏–±–∫–∏ –≤ –¥–µ–π—Å—Ç–≤–∏–∏, —á—Ç–æ–±—ã –≤—ã –º–æ–≥–ª–∏ –ø–æ–Ω—è—Ç—å, –∫–∞–∫ –∏—Å–ø—Ä–∞–≤–∏—Ç—å –µ–µ –≤ —Å–≤–æ–µ–º –∫–æ–¥–µ.

TypeError: –æ–±—ä–µ–∫—Ç —Ç–∏–ø–∞ " NoneType " –Ω–µ –∏–º–µ–µ—Ç len ()

NoneType –æ—Ç–Ω–æ—Å–∏—Ç—Å—è –∫ —Ç–∏–ø—É –¥–∞–Ω–Ω—ã—Ö None. –í—ã –Ω–µ –º–æ–∂–µ—Ç–µ –∏—Å–ø–æ–ª—å–∑–æ–≤–∞—Ç—å –º–µ—Ç–æ–¥—ã, –∫–æ—Ç–æ—Ä—ã–µ –±—É–¥—É—Ç —Ä–∞–±–æ—Ç–∞—Ç—å —Å –ø–æ–≤—Ç–æ—Ä—è–µ–º—ã–º–∏ –æ–±—ä–µ–∫—Ç–∞–º–∏, —Ç–∞–∫–∏–º–∏ –∫–∞–∫ len (), –¥–ª—è –∑–Ω–∞—á–µ–Ω–∏—è None. –≠—Ç–æ –ø–æ—Ç–æ–º—É, —á—Ç–æ None –Ω–µ —Å–æ–¥–µ—Ä–∂–∏—Ç –Ω–∞–±–æ—Ä–∞ –∑–Ω–∞—á–µ–Ω–∏–π. –î–ª–∏–Ω–∞ None –Ω–µ –º–æ–∂–µ—Ç –±—ã—Ç—å –≤—ã—á–∏—Å–ª–µ–Ω–∞, –ø–æ—Ç–æ–º—É —á—Ç–æ None –Ω–µ –∏–º–µ–µ—Ç –¥–æ—á–µ—Ä–Ω–∏—Ö –∑–Ω–∞—á–µ–Ω–∏–π.

–≠—Ç–∞ –æ—à–∏–±–∫–∞ —á–∞—Å—Ç–æ –≤—Å—Ç—Ä–µ—á–∞–µ—Ç—Å—è –≤ –¥–≤—É—Ö —Å–ª—É—á–∞—è—Ö:

  • –ï—Å–ª–∏ –≤—ã –∑–∞–±—ã–ª–∏, —á—Ç–æ –ø–æ—Å—Ç—Ä–æ–µ–Ω -in —Ñ—É–Ω–∫—Ü–∏–∏ –∏–∑–º–µ–Ω—è—é—Ç —Å–ø–∏—Å–æ–∫ –Ω–∞ –º–µ—Å—Ç–µ
  • –ï—Å–ª–∏ –≤—ã –∑–∞–±—ã–≤–∞–µ—Ç–µ –æ–ø–µ—Ä–∞—Ç–æ—Ä return –≤ —Ñ—É–Ω–∫—Ü–∏–∏

–î–∞–≤–∞–π—Ç–µ –ø–æ–¥—Ä–æ–±–Ω–æ —Ä–∞—Å—Å–º–æ—Ç—Ä–∏–º –∫–∞–∂–¥—É—é –∏–∑ —ç—Ç–∏—Ö –ø—Ä–∏—á–∏–Ω.

–ü—Ä–∏—á–∏–Ω–∞ ‚Ññ1: –≤—Å—Ç—Ä–æ–µ–Ω–Ω—ã–µ —Ñ—É–Ω–∫—Ü–∏–∏ –º–µ–Ω—è—é—Ç —Å–ø–∏—Å–∫–∏ –Ω–∞ –º–µ—Å—Ç–µ

–ú—ã —Å–æ–±–∏—Ä–∞–µ–º—Å—è —Å–æ–∑–¥–∞—Ç—å –ø—Ä–æ–≥—Ä–∞–º–º—É, –∫–æ—Ç–æ—Ä–∞—è —Å–æ—Ä—Ç–∏—Ä—É–µ—Ç —Å–ø–∏—Å–æ–∫ —Å–ª–æ–≤–∞—Ä–µ–π, —Å–æ–¥–µ—Ä–∂–∞—â–∏—Ö –∏–Ω—Ñ–æ—Ä–º–∞—Ü–∏—é –æ–± —É—á–∞—â–∏—Ö—Å—è –≤ —à–∫–æ–ª–µ. –ú—ã –æ—Ç—Å–æ—Ä—Ç–∏—Ä—É–µ–º —ç—Ç–æ—Ç —Å–ø–∏—Å–æ–∫ –≤ –ø–æ—Ä—è–¥–∫–µ –≤–æ–∑—Ä–∞—Å—Ç–∞–Ω–∏—è –æ—Ü–µ–Ω–∫–∏ —É—á–∞—â–µ–≥–æ—Å—è –ø–æ –ø–æ—Å–ª–µ–¥–Ω–µ–º—É —Ç–µ—Å—Ç—É.

–î–ª—è –Ω–∞—á–∞–ª–∞ –æ–ø—Ä–µ–¥–µ–ª–∏—Ç–µ —Å–ø–∏—Å–æ–∫ —Å–ª–æ–≤–∞—Ä–µ–π, –∫–æ—Ç–æ—Ä—ã–π —Å–æ–¥–µ—Ä–∂–∏—Ç –∏–Ω—Ñ–æ—Ä–º–∞—Ü–∏—é –æ–± —É—á–∞—â–∏—Ö—Å—è –∏ –∏—Ö –ø–æ—Å–ª–µ–¥–Ω–∏—Ö —Ä–µ–∑—É–ª—å—Ç–∞—Ç–∞—Ö —Ç–µ—Å—Ç–∞:

–ö–∞–∂–¥—ã–π —Å–ª–æ–≤–∞—Ä—å —Å–æ–¥–µ—Ä–∂–∏—Ç –¥–≤–∞ –∫–ª—é—á–∞ –∏ –∑–Ω–∞—á–µ–Ω–∏—è. –û–¥–∏–Ω —Å–æ–æ—Ç–≤–µ—Ç—Å—Ç–≤—É–µ—Ç –∏–º–µ–Ω–∏ —Å—Ç—É–¥–µ–Ω—Ç–∞, –∞ –¥—Ä—É–≥–æ–π - –±–∞–ª–ª—É, –ø–æ–ª—É—á–µ–Ω–Ω–æ–º—É —Å—Ç—É–¥–µ–Ω—Ç–æ–º –Ω–∞ –ø–æ—Å–ª–µ–¥–Ω–µ–º —Ç–µ—Å—Ç–µ. –ó–∞—Ç–µ–º –∏—Å–ø–æ–ª—å–∑—É–π—Ç–µ –º–µ—Ç–æ–¥ sort (), —á—Ç–æ–±—ã –æ—Ç—Å–æ—Ä—Ç–∏—Ä–æ–≤–∞—Ç—å –Ω–∞—à —Å–ø–∏—Å–æ–∫ —Å—Ç—É–¥–µ–Ω—Ç–æ–≤:

81% —É—á–∞—Å—Ç–Ω–∏–∫–æ–≤ –∑–∞—è–≤–∏–ª–∏, —á—Ç–æ –æ–Ω–∏ –ø–æ—á—É–≤—Å—Ç–≤–æ–≤–∞–ª–∏ —Å–µ–±—è –±–æ–ª–µ–µ —É–≤–µ—Ä–µ–Ω–Ω—ã–º–∏ –≤ —Å–≤–æ–∏—Ö –ø–µ—Ä—Å–ø–µ–∫—Ç–∏–≤–∞—Ö —Ç—Ä—É–¥–æ—É—Å—Ç—Ä–æ–π—Å—Ç–≤–∞ –≤ —Å—Ñ–µ—Ä–µ –≤—ã—Å–æ–∫–∏—Ö —Ç–µ—Ö–Ω–æ–ª–æ–≥–∏–π –ø–æ—Å–ª–µ –ø–æ—Å–µ—â–µ–Ω–∏—è —É—á–µ–±–Ω–æ–≥–æ –ª–∞–≥–µ—Ä—è. –ü–æ–ª—É—á–∏—Ç–µ –ø—Ä–∏–≥–ª–∞—à–µ–Ω–∏–µ –Ω–∞ —É—á–µ–±–Ω—ã–π –∫—É—Ä—Å —Å–µ–≥–æ–¥–Ω—è.

–°—Ä–µ–¥–Ω–∏–π –≤—ã–ø—É—Å–∫–Ω–∏–∫ —É—á–µ–±–Ω–æ–≥–æ –ª–∞–≥–µ—Ä—è –ø–æ—Ç—Ä–∞—Ç–∏–ª –º–µ–Ω–µ–µ —à–µ—Å—Ç–∏ –º–µ—Å—è—Ü–µ–≤ –Ω–∞ –ø–µ—Ä–µ—Ö–æ–¥–Ω—É—é –∫–∞—Ä—å–µ—Ä—É, –æ—Ç –Ω–∞—á–∞–ª–∞ —É—á–µ–±–Ω–æ–≥–æ –ª–∞–≥–µ—Ä—è –¥–æ –ø–æ–∏—Å–∫–∞ —Å–≤–æ–µ–π –ø–µ—Ä–≤–æ–π —Ä–∞–±–æ—Ç—ã.

–ú—ã –æ–±—ä—è–≤–∏–ª–∏ —Ñ—É–Ω–∫—Ü–∏—é, –Ω–∞–∑—ã–≤–∞–µ–º—É—é " score_sort " –∫–æ—Ç–æ—Ä—ã–π –≤–æ–∑–≤—Ä–∞—â–∞–µ—Ç –∑–Ω–∞—á–µ–Ω–∏–µ " score " –≤ –∫–∞–∂–¥–æ–º —Å–ª–æ–≤–∞—Ä–µ. –ó–∞—Ç–µ–º –º—ã –∏—Å–ø–æ–ª—å–∑—É–µ–º —ç—Ç–æ, —á—Ç–æ–±—ã —É–ø–æ—Ä—è–¥–æ—á–∏—Ç—å —ç–ª–µ–º–µ–Ω—Ç—ã –≤ –Ω–∞—à–µ–º —Å–ø–∏—Å–∫–µ —Å–ª–æ–≤–∞—Ä–µ–π —Å –ø–æ–º–æ—â—å—é –º–µ—Ç–æ–¥–∞ sort ().

–ó–∞—Ç–µ–º –º—ã —Ä–∞—Å–ø–µ—á–∞—Ç—ã–≤–∞–µ–º –¥–ª–∏–Ω—É –Ω–∞—à–µ–≥–æ —Å–ø–∏—Å–∫–∞:

–ú—ã —Ä–∞—Å–ø–µ—á–∞—Ç—ã–≤–∞–µ–º –Ω–æ–≤—ã–π —Å–ø–∏—Å–æ–∫ —Å–ª–æ–≤–∞—Ä–µ–π –Ω–∞ –∫–æ–Ω—Å–æ–ª—å —Å –ø–æ–º–æ—â—å—é —Ü–∏–∫–ª–∞ for :

–≠—Ç–æ—Ç –∫–æ–¥ –≤—ã–≤–æ–¥–∏—Ç —Å–æ–æ–±—â–µ–Ω–∏–µ, –∏–Ω—Ñ–æ—Ä–º–∏—Ä—É—é—â–µ–µ –Ω–∞—Å –æ —Ç–æ–º, —Å–∫–æ–ª—å–∫–æ –æ—Ü–µ–Ω–æ–∫ —Å—Ç—É–¥–µ–Ω—Ç –∑–∞—Ä–∞–±–æ—Ç–∞–ª –Ω–∞ —Å–≤–æ–µ–º –ø–æ—Å–ª–µ–¥–Ω–µ–º —Ç–µ—Å—Ç–µ –ø–æ –∫–∞–∂–¥—ã–π —É—á–∞—â–∏–π—Å—è –≤ —Å–ø–∏—Å–∫–µ " sorted_students & rdquo ;. –î–∞–≤–∞–π—Ç–µ –∑–∞–ø—É—Å—Ç–∏–º –Ω–∞—à –∫–æ–¥:

–ù–∞—à –∫–æ–¥ –≤–æ–∑–≤—Ä–∞—â–∞–µ—Ç –æ—à–∏–±–∫—É.

–ß—Ç–æ–±—ã —Ä–µ—à–∏—Ç—å —ç—Ç—É –ø—Ä–æ–±–ª–µ–º—É, –Ω–∞–º –Ω—É–∂–Ω–æ —É–¥–∞–ª–∏—Ç—å –∫–æ–¥, –≤ –∫–æ—Ç–æ—Ä–æ–º –º—ã –Ω–∞–∑–Ω–∞—á–∞–µ–º —Ä–µ–∑—É–ª—å—Ç–∞—Ç –º–µ—Ç–æ–¥–∞ sort () –¥–ª—è " sorted_students & rdquo ;. –≠—Ç–æ —Å–≤—è–∑–∞–Ω–æ —Å —Ç–µ–º, —á—Ç–æ –º–µ—Ç–æ–¥ sort () –∏–∑–º–µ–Ω—è–µ—Ç —Å–ø–∏—Å–æ–∫ –Ω–∞ –º–µ—Å—Ç–µ. –û–Ω –Ω–µ —Å–æ–∑–¥–∞–µ—Ç –Ω–æ–≤—ã–π —Å–ø–∏—Å–æ–∫.

–£–¥–∞–ª–∏—Ç–µ –æ–±—ä—è–≤–ª–µ–Ω–∏–µ " sorted_students " —Å–ø–∏—Å–æ–∫ –∏ –∏—Å–ø–æ–ª—å–∑–æ–≤–∞–Ω–∏–µ " —Å—Ç—É–¥–µ–Ω—Ç–æ–≤ " –≤ –æ—Å—Ç–∞–ª—å–Ω–æ–π —á–∞—Å—Ç–∏ –Ω–∞—à–µ–π –ø—Ä–æ–≥—Ä–∞–º–º—ã:

–ó–∞–ø—É—Å—Ç–∏—Ç–µ –Ω–∞—à –∫–æ–¥ –∏ –ø–æ—Å–º–æ—Ç—Ä–∏—Ç–µ, —á—Ç–æ –ø—Ä–æ–∏–∑–æ–π–¥–µ—Ç:

–ù–∞—à –∫–æ–¥ –≤—ã–ø–æ–ª–Ω—è–µ—Ç—Å—è —É—Å–ø–µ—à–Ω–æ. –í–æ-–ø–µ—Ä–≤—ã—Ö, –Ω–∞—à –∫–æ–¥ —Å–æ–æ–±—â–∞–µ—Ç –Ω–∞–º, —Å–∫–æ–ª—å–∫–æ —Å—Ç—É–¥–µ–Ω—Ç–æ–≤ –≤ –Ω–∞—à–µ–º —Å–ø–∏—Å–∫–µ. –ó–∞—Ç–µ–º –Ω–∞—à –∫–æ–¥ —Ä–∞—Å–ø–µ—á–∞—Ç—ã–≤–∞–µ—Ç –∏–Ω—Ñ–æ—Ä–º–∞—Ü–∏—é –æ –∫–∞–∂–¥–æ–º —É—á–µ–Ω–∏–∫–µ –∏ –æ —Ç–æ–º, —Å–∫–æ–ª—å–∫–æ –±–∞–ª–ª–æ–≤ –æ–Ω–∏ –∑–∞—Ä–∞–±–æ—Ç–∞–ª–∏ –Ω–∞ –ø–æ—Å–ª–µ–¥–Ω–µ–º —Ç–µ—Å—Ç–µ. –≠—Ç–∞ –∏–Ω—Ñ–æ—Ä–º–∞—Ü–∏—è —Ä–∞—Å–ø–µ—á–∞—Ç—ã–≤–∞–µ—Ç—Å—è –≤ –ø–æ—Ä—è–¥–∫–µ –≤–æ–∑—Ä–∞—Å—Ç–∞–Ω–∏—è –æ—Ü–µ–Ω–æ–∫ —É—á–∞—â–µ–≥–æ—Å—è.

–ü—Ä–∏—á–∏–Ω–∞ ‚Ññ 2: –ó–∞–±—ã—Ç—å –æ–ø–µ—Ä–∞—Ç–æ—Ä –≤–æ–∑–≤—Ä–∞—Ç–∞

–ú—ã —Å–æ–±–∏—Ä–∞–µ–º—Å—è —Å–¥–µ–ª–∞—Ç—å –Ω–∞—à –∫–æ–¥ –±–æ–ª–µ–µ –º–æ–¥—É–ª—å–Ω—ã–º. –î–ª—è —ç—Ç–æ–≥–æ –º—ã –ø–µ—Ä–µ–º–µ—Å—Ç–∏–º –Ω–∞—à –º–µ—Ç–æ–¥ —Å–æ—Ä—Ç–∏—Ä–æ–≤–∫–∏ –≤ –æ—Ç–¥–µ–ª—å–Ω—É—é —Ñ—É–Ω–∫—Ü–∏—é. –ú—ã ; ll —Ç–∞–∫–∂–µ –æ–ø—Ä–µ–¥–µ–ª—è—Ç —Ñ—É–Ω–∫—Ü–∏—é, –∫–æ—Ç–æ—Ä–∞—è —Ä–∞—Å–ø–µ—á–∞—Ç—ã–≤–∞–µ—Ç –∏–Ω—Ñ–æ—Ä–º–∞—Ü–∏—é –æ —Ç–æ–º, –∫–∞–∫–æ–π –±–∞–ª–ª –∫–∞–∂–¥—ã–π —Å—Ç—É–¥–µ–Ω—Ç –∑–∞—Ä–∞–±–æ—Ç–∞–ª –Ω–∞ —Å–≤–æ–µ–º —Ç–µ—Å—Ç–µ.

–ù–∞—á–Ω–∏—Ç–µ —Å –æ–ø—Ä–µ–¥–µ–ª–µ–Ω–∏—è –Ω–∞—à–µ–≥–æ —Å–ø–∏—Å–∫–∞ —Å—Ç—É–¥–µ–Ω—Ç–æ–≤ –∏ –Ω–∞—à–µ–π –≤—Å–ø–æ–º–æ–≥–∞—Ç–µ–ª—å–Ω–æ–π —Ñ—É–Ω–∫—Ü–∏–∏ —Å–æ—Ä—Ç–∏—Ä–æ–≤–∫–∏. –ú—ã –ø–æ–∑–∞–∏–º—Å—Ç–≤—É–µ–º —ç—Ç–æ—Ç –∫–æ–¥ –∏–∑ —Ä–∞–Ω–µ–µ –≤ —ç—Ç–æ–º —Ä—É–∫–æ–≤–æ–¥—Å—Ç–≤–µ.

–ó–∞—Ç–µ–º –Ω–∞–ø–∏—à–∏—Ç–µ —Ñ—É–Ω–∫—Ü–∏—é, –∫–æ—Ç–æ—Ä–∞—è —Å–æ—Ä—Ç–∏—Ä—É–µ—Ç –Ω–∞—à —Å–ø–∏—Å–æ–∫:

–ù–∞–∫–æ–Ω–µ—Ü, –º—ã –æ–ø—Ä–µ–¥–µ–ª—è–µ–º —Ñ—É–Ω–∫—Ü–∏—é, –∫–æ—Ç–æ—Ä–∞—è –æ—Ç–æ–±—Ä–∞–∂–∞–µ—Ç –∏–Ω—Ñ–æ—Ä–º–∞—Ü–∏—é –æ –∫–∞–∂–¥–æ–º —Å—Ç—É–¥–µ–Ω—Ç–µ " –ø—Ä–æ–∏–∑–≤–æ–¥–∏—Ç–µ–ª—å–Ω–æ—Å—Ç—å:

–ü–µ—Ä–µ–¥ –∑–∞–ø—É—Å–∫–æ–º –Ω–∞—à–µ–≥–æ –∫–æ–¥–∞ –º—ã –¥–æ–ª–∂–Ω—ã –≤—ã–∑–≤–∞—Ç—å –Ω–∞—à–∏ —Ñ—É–Ω–∫—Ü–∏–∏:

–ù–∞—à–∞ –ø—Ä–æ–≥—Ä–∞–º–º–∞ —Å–Ω–∞—á–∞–ª–∞ –æ—Ç—Å–æ—Ä—Ç–∏—Ä—É–µ—Ç –Ω–∞—à —Å–ø–∏—Å–æ–∫ —Å –ø–æ–º–æ—â—å—é —Ñ—É–Ω–∫—Ü–∏–∏ sort_list (). –ó–∞—Ç–µ–º –Ω–∞—à–∞ –ø—Ä–æ–≥—Ä–∞–º–º–∞ —Ä–∞—Å–ø–µ—á–∞—Ç–∞–µ—Ç –∏–Ω—Ñ–æ—Ä–º–∞—Ü–∏—é –æ –∫–∞–∂–¥–æ–º —É—á–µ–Ω–∏–∫–µ –Ω–∞ –∫–æ–Ω—Å–æ–ª—å. –≠—Ç–æ –æ–±—Ä–∞–±–∞—Ç—ã–≤–∞–µ—Ç—Å—è –≤ —Ñ—É–Ω–∫—Ü–∏–∏ show_students ().

–î–∞–≤–∞–π—Ç–µ –∑–∞–ø—É—Å—Ç–∏–º –Ω–∞—à –∫–æ–¥:

–ù–∞—à –∫–æ–¥ –≤–æ–∑–≤—Ä–∞—â–∞–µ—Ç –æ—à–∏–±–∫—É. –≠—Ç–∞ –æ—à–∏–±–∫–∞ –≤–æ–∑–Ω–∏–∫–ª–∞ –∏–∑-–∑–∞ —Ç–æ–≥–æ, —á—Ç–æ –º—ã –∑–∞–±—ã–ª–∏ –≤–∫–ª—é—á–∏—Ç—å " return " –≤—ã—Ä–∞–∂–µ–Ω–∏–µ –≤ –Ω–∞—à–µ–º " sort_list " —Ñ—É–Ω–∫—Ü–∏—è.

–ö–æ–≥–¥–∞ –º—ã –≤—ã–∑—ã–≤–∞–µ–º –Ω–∞—à—É —Ñ—É–Ω–∫—Ü–∏—é sort_list (), –º—ã –ø—Ä–∏—Å–≤–∞–∏–≤–∞–µ–º –µ–µ –æ—Ç–≤–µ—Ç –ø–µ—Ä–µ–º–µ–Ω–Ω–æ–π " new_students & rdquo ;. –≠—Ç–∞ –ø–µ—Ä–µ–º–µ–Ω–Ω–∞—è –ø–µ—Ä–µ–¥–∞–µ—Ç—Å—è –≤ –Ω–∞—à—É —Ñ—É–Ω–∫—Ü–∏—é show_students (), –∫–æ—Ç–æ—Ä–∞—è –æ—Ç–æ–±—Ä–∞–∂–∞–µ—Ç –∏–Ω—Ñ–æ—Ä–º–∞—Ü–∏—é –æ –∫–∞–∂–¥–æ–º —É—á–µ–Ω–∏–∫–µ. –ß—Ç–æ–±—ã —Ä–µ—à–∏—Ç—å —ç—Ç—É –æ—à–∏–±–∫—É, –º—ã –¥–æ–ª–∂–Ω—ã –¥–æ–±–∞–≤–∏—Ç—å –æ–ø–µ—Ä–∞—Ç–æ—Ä return –∫ —Ñ—É–Ω–∫—Ü–∏–∏ sort_list ():

"–ö–∞—Ä—å–µ—Ä–Ω–∞—è –∫–∞—Ä–º–∞ –≤–æ—à–ª–∞ –≤ –º–æ—é –∂–∏–∑–Ω—å, –∫–æ–≥–¥–∞ —è –±–æ–ª—å—à–µ –≤—Å–µ–≥–æ –≤ –Ω–µ–π –Ω—É–∂–¥–∞–ª–∞—Å—å, –∏ –±—ã—Å—Ç—Ä–æ –ø–æ–º–æ–≥–ª–∞ –º–Ω–µ —Å–æ–≤–º–µ—Å—Ç–∏—Ç–µ —Å —É—á–µ–±–Ω—ã–º –ª–∞–≥–µ—Ä–µ–º. –ß–µ—Ä–µ–∑ –¥–≤–∞ –º–µ—Å—è—Ü–∞ –ø–æ—Å–ª–µ –≤—ã–ø—É—Å–∫–∞ —è –Ω–∞—à–ª–∞ —Ä–∞–±–æ—Ç—É —Å–≤–æ–µ–π –º–µ—á—Ç—ã, –∫–æ—Ç–æ—Ä–∞—è —Å–æ–æ—Ç–≤–µ—Ç—Å—Ç–≤–æ–≤–∞–ª–∞ –º–æ–∏–º —Ü–µ–Ω–Ω–æ—Å—Ç—è–º –∏ —Ü–µ–ª—è–º –≤ –∂–∏–∑–Ω–∏! "

–í–µ–Ω–µ—Ä–∞, –∏–Ω–∂–µ–Ω–µ—Ä-–ø—Ä–æ–≥—Ä–∞–º–º–∏—Å—Ç –≤ Rockbot

–ó–∞–ø—É—Å—Ç–∏–º –Ω–∞—à –∫–æ–¥:

–ù–∞—à –∫–æ–¥ –≤–æ–∑–≤—Ä–∞—â–∞–µ—Ç –æ–∂–∏–¥–∞–µ–º—ã–π –æ—Ç–≤–µ—Ç.

–ó–∞–∫–ª—é—á–µ–Ω–∏–µ

–û–±—ä–µ–∫—Ç " TypeError: —Ç–∏–ø–∞ " NoneType " –Ω–µ –∏–º–µ–µ—Ç –æ—à–∏–±–∫–∏ len () " –ø—Ä–∏ –ø–æ–ø—ã—Ç–∫–µ –∏—Å–ø–æ–ª—å–∑—É–π—Ç–µ –º–µ—Ç–æ–¥ len () –¥–ª—è –æ–±—ä–µ–∫—Ç–∞, –∑–Ω–∞—á–µ–Ω–∏–µ –∫–æ—Ç–æ—Ä–æ–≥–æ —Ä–∞–≤–Ω–æ None.

–ß—Ç–æ–±—ã —Ä–µ—à–∏—Ç—å —ç—Ç—É –æ—à–∏–±–∫—É, —É–±–µ–¥–∏—Ç–µ—Å—å, —á—Ç–æ –≤—ã –Ω–µ –Ω–∞–∑–Ω–∞—á–∞–µ—Ç–µ –æ—Ç–≤–µ—Ç—ã –∫–∞–∫–∏—Ö-–ª–∏–±–æ –≤—Å—Ç—Ä–æ–µ–Ω–Ω—ã—Ö –ø–µ—Ä–µ—á–∏—Å–ª–∏—Ç—å –º–µ—Ç–æ–¥—ã, —Ç–∞–∫–∏–µ –∫–∞–∫ sort (), –≤ –ø–µ—Ä–µ–º–µ–Ω–Ω—É—é. –ï—Å–ª–∏ —ç—Ç–æ –Ω–µ –ø–æ–º–æ–≥–∞–µ—Ç —É—Å—Ç—Ä–∞–Ω–∏—Ç—å –æ—à–∏–±–∫—É, —É–±–µ–¥–∏—Ç–µ—Å—å, —á—Ç–æ –≤ –≤–∞—à–µ–π –ø—Ä–æ–≥—Ä–∞–º–º–µ –µ—Å—Ç—å –≤—Å–µ –æ–ø–µ—Ä–∞—Ç–æ—Ä—ã " return ", –Ω–µ–æ–±—Ö–æ–¥–∏–º—ã–µ –¥–ª—è —É—Å–ø–µ—à–Ω–æ–≥–æ —Ñ—É–Ω–∫—Ü–∏–æ–Ω–∏—Ä–æ–≤–∞–Ω–∏—è.

–¢–µ–ø–µ—Ä—å –≤—ã –≥–æ—Ç–æ–≤—ã —Ä–µ—à–∞—Ç—å —ç—Ç—É –ø—Ä–æ–±–ª–µ–º—É, –∫–∞–∫ –ø—Ä–æ—Ñ–µ—Å—Å–∏–æ–Ω–∞–ª –ø–æ Python!

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