{"id":1671,"date":"2025-09-30T23:05:51","date_gmt":"2025-09-30T16:05:51","guid":{"rendered":"https:\/\/kienthucmo.com\/?p=1671"},"modified":"2025-11-05T23:46:21","modified_gmt":"2025-11-05T16:46:21","slug":"tong-hop-cac-ham-xu-ly-dictionary-voi-python","status":"publish","type":"post","link":"https:\/\/kienthucmo.com\/vi\/tong-hop-cac-ham-xu-ly-dictionary-voi-python\/","title":{"rendered":"T\u1ed5ng h\u1ee3p c\u00e1c h\u00e0m x\u1eed l\u00fd Dictionary v\u1edbi Python"},"content":{"rendered":"\n

Khi l\u00e0m vi\u1ec7c v\u1edbi Python, ch\u1eafc h\u1eb3n b\u1ea1n v\u00e0 m\u00ecnh \u0111\u1ec1u th\u01b0\u1eddng xuy\u00ean g\u1eb7p dictionary<\/code> (hay dict<\/code>). \u0110\u00e2y l\u00e0 c\u1ea5u tr\u00fac d\u1eef li\u1ec7u quen thu\u1ed9c nh\u1edd kh\u1ea3 n\u0103ng l\u01b0u tr\u1eef v\u00e0 truy xu\u1ea5t nhanh theo c\u1eb7p key\u2013value<\/strong>. Tuy v\u1eady, \u0111\u1ec3 khai th\u00e1c t\u1ed1i \u0111a s\u1ee9c m\u1ea1nh c\u1ee7a n\u00f3, ch\u00fang ta c\u1ea7n n\u1eafm v\u1eefng nh\u1eefng h\u00e0m v\u00e0 ph\u01b0\u01a1ng th\u1ee9c x\u1eed l\u00fd \u0111i k\u00e8m.<\/p>\n\n\n\n

Trong b\u00e0i vi\u1ebft n\u00e0y, thay v\u00ec ch\u1ec9 li\u1ec7t k\u00ea kh\u00f4 khan, m\u00ecnh mu\u1ed1n c\u00f9ng b\u1ea1n \u201c\u0111i m\u1ed9t v\u00f2ng\u201d qua c\u00e1c thao t\u00e1c quan tr\u1ecdng nh\u1ea5t v\u1edbi dict<\/code>: t\u1eeb kh\u1edfi t\u1ea1o, truy xu\u1ea5t, th\u00eam\/x\u00f3a, cho \u0111\u1ebfn c\u00e1c th\u1ee7 thu\u1eadt n\u00e2ng cao v\u00e0 t\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t. M\u1ed7i ph\u1ea7n s\u1ebd c\u00f3 v\u00ed d\u1ee5 minh h\u1ecda k\u00e8m gi\u1ea3i th\u00edch chi ti\u1ebft, \u0111\u1ec3 c\u1ea3 hai ch\u00fang ta v\u1eeba \u00f4n l\u1ea1i ki\u1ebfn th\u1ee9c, v\u1eeba c\u1ee7ng c\u1ed1 th\u00eam kinh nghi\u1ec7m s\u1eed d\u1ee5ng dict<\/code> trong th\u1ef1c t\u1ebf.<\/p>\n\n\n\n

B\u1ea3ng t\u1ed5ng h\u1ee3p c\u00e1c thao t\u00e1c ph\u1ed5 bi\u1ebfn v\u1edbi Dictionary trong Python <\/h3>\n\n\n\n
Nh\u00f3m thao t\u00e1c<\/strong><\/th>Ph\u01b0\u01a1ng th\u1ee9c \/ C\u00e1ch d\u00f9ng<\/strong><\/th>M\u00f4 t\u1ea3<\/strong><\/th><\/tr><\/thead>
Kh\u1edfi t\u1ea1o<\/strong><\/td>dict()<\/code>, {}<\/code>, dict.fromkeys(keys, value)<\/code><\/td>T\u1ea1o dictionary r\u1ed7ng ho\u1eb7c v\u1edbi gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh<\/td><\/tr>
Truy xu\u1ea5t<\/strong><\/td>dict[key]<\/code>, dict.get(key, default)<\/code><\/td>L\u1ea5y value theo key, c\u00f3 th\u1ec3 k\u00e8m gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh<\/td><\/tr>
Ki\u1ec3m tra<\/strong><\/td>key in dict<\/code><\/td>Ki\u1ec3m tra key c\u00f3 t\u1ed3n t\u1ea1i trong dictionary hay kh\u00f4ng<\/td><\/tr>
Th\u00eam\/C\u1eadp nh\u1eadt<\/strong><\/td>dict[key] = value<\/code>, dict.update(other)<\/code><\/td>Th\u00eam key m\u1edbi ho\u1eb7c c\u1eadp nh\u1eadt value<\/td><\/tr>
X\u00f3a<\/strong><\/td>dict.pop(key, default)<\/code>, del dict[key]<\/code>, dict.popitem()<\/code>, dict.clear()<\/code><\/td>X\u00f3a ph\u1ea7n t\u1eed theo key, x\u00f3a ph\u1ea7n t\u1eed cu\u1ed1i c\u00f9ng, ho\u1eb7c x\u00f3a to\u00e0n b\u1ed9 dictionary<\/td><\/tr>
Truy xu\u1ea5t t\u1eadp h\u1ee3p<\/strong><\/td>dict.keys()<\/code>, dict.values()<\/code>, dict.items()<\/code><\/td>Tr\u1ea3 v\u1ec1 view ch\u1ee9a keys, values ho\u1eb7c items<\/td><\/tr>
Sao ch\u00e9p<\/strong><\/td>dict.copy()<\/code>, copy.deepcopy(dict)<\/code><\/td>T\u1ea1o b\u1ea3n sao shallow ho\u1eb7c deep<\/td><\/tr>
Kh\u1edfi t\u1ea1o c\u00f3 \u0111i\u1ec1u ki\u1ec7n<\/strong><\/td>dict.setdefault(key, default)<\/code><\/td>L\u1ea5y value n\u1ebfu key t\u1ed3n t\u1ea1i, n\u1ebfu kh\u00f4ng th\u00ec g\u00e1n gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh<\/td><\/tr>
Comprehension<\/strong><\/td>{k: v for k, v in iterable}<\/code><\/td>T\u1ea1o dictionary b\u1eb1ng bi\u1ec3u th\u1ee9c duy\u1ec7t (ng\u1eafn g\u1ecdn, linh ho\u1ea1t)<\/td><\/tr>
H\u1ee3p nh\u1ea5t<\/strong><\/td>`dict1<\/td>dict2(Python 3.9+),<\/code>{**d1, **d2}`<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

1. Kh\u1edfi t\u1ea1o Dictionary<\/h2>\n\n\n\n

Python cung c\u1ea5p nhi\u1ec1u c\u00e1ch kh\u1edfi t\u1ea1o dict<\/code>. Hi\u1ec3u r\u00f5 c\u00e1ch t\u1ea1o gi\u00fap code ng\u1eafn g\u1ecdn v\u00e0 tr\u00e1nh l\u1ed7i.<\/p>\n\n\n\n

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