{"id":1675,"date":"2025-10-01T11:25:49","date_gmt":"2025-10-01T04:25:49","guid":{"rendered":"https:\/\/kienthucmo.com\/?p=1675"},"modified":"2025-10-01T11:29:39","modified_gmt":"2025-10-01T04:29:39","slug":"tu-co-ban-den-nang-cao-ghi-file-hieu-qua-voi-python","status":"publish","type":"post","link":"https:\/\/kienthucmo.com\/vi\/tu-co-ban-den-nang-cao-ghi-file-hieu-qua-voi-python\/","title":{"rendered":"T\u1eeb c\u01a1 b\u1ea3n \u0111\u1ebfn n\u00e2ng cao: Ghi file hi\u1ec7u qu\u1ea3 v\u1edbi Python"},"content":{"rendered":"\n

Trong qu\u00e1 tr\u00ecnh l\u1eadp tr\u00ecnh, ch\u1eafc h\u1eb3n ai trong ch\u00fang ta c\u0169ng t\u1eebng c\u1ea7n \u0111\u1ebfn vi\u1ec7c l\u01b0u d\u1eef li\u1ec7u ra file<\/strong>: t\u1eeb nh\u1eefng d\u00f2ng log \u0111\u1ec3 theo d\u00f5i ch\u01b0\u01a1ng tr\u00ecnh, \u0111\u1ebfn vi\u1ec7c xu\u1ea5t b\u00e1o c\u00e1o, l\u01b0u danh s\u00e1ch ng\u01b0\u1eddi d\u00f9ng hay ghi l\u1ea1i k\u1ebft qu\u1ea3 x\u1eed l\u00fd. \u0110\u00e2y l\u00e0 m\u1ed9t thao t\u00e1c t\u01b0\u1edfng ch\u1eebng nh\u1ecf, nh\u01b0ng l\u1ea1i c\u1ef1c k\u1ef3 quan tr\u1ecdng \u0111\u1ec3 ph\u1ea7n m\u1ec1m v\u1eadn h\u00e0nh m\u01b0\u1ee3t m\u00e0 v\u00e0 ti\u1ec7n d\u1ee5ng.<\/p>\n\n\n\n

Python mang \u0111\u1ebfn cho l\u1eadp tr\u00ecnh vi\u00ean m\u1ed9t b\u1ed9 c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd v\u00e0 d\u1ec5 d\u00f9ng \u0111\u1ec3 l\u00e0m vi\u1ec7c v\u1edbi file. Ch\u1ec9 v\u1edbi v\u00e0i d\u00f2ng l\u1ec7nh, m\u00ecnh c\u00f3 th\u1ec3 t\u1ea1o file m\u1edbi, ghi d\u1eef li\u1ec7u v\u0103n b\u1ea3n ho\u1eb7c nh\u1ecb ph\u00e2n, th\u1eadm ch\u00ed l\u00e0m vi\u1ec7c v\u1edbi \u0111\u1ecbnh d\u1ea1ng ph\u1ee9c t\u1ea1p nh\u01b0 CSV hay JSON. Kh\u00f4ng nh\u1eefng v\u1eady, Python c\u00f2n h\u1ed7 tr\u1ee3 c\u01a1 ch\u1ebf qu\u1ea3n l\u00fd t\u00e0i nguy\u00ean an to\u00e0n, gi\u00fap h\u1ea1n ch\u1ebf l\u1ed7i v\u00e0 \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef \u1ed5n \u0111\u1ecbnh.<\/p>\n\n\n\n

Trong b\u00e0i vi\u1ebft n\u00e0y, m\u00ecnh s\u1ebd c\u00f9ng b\u1ea1n \u0111i qua to\u00e0n b\u1ed9 ki\u1ebfn th\u1ee9c quan tr\u1ecdng v\u1ec1 ghi file trong Python<\/strong>. T\u1eeb nh\u1eefng thao t\u00e1c c\u01a1 b\u1ea3n nh\u01b0 open()<\/code>, write()<\/code>, \u0111\u1ebfn nh\u1eefng k\u1ef9 thu\u1eadt n\u00e2ng cao h\u01a1n nh\u01b0 ghi theo chunks, x\u1eed l\u00fd encoding, hay s\u1eed d\u1ee5ng th\u01b0 vi\u1ec7n chu\u1ea9n \u0111\u1ec3 ghi d\u1eef li\u1ec7u c\u00f3 c\u1ea5u tr\u00fac. C\u00e1c v\u00ed d\u1ee5 s\u1ebd \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y chi ti\u1ebft, gi\u1ea3i th\u00edch r\u00f5 r\u00e0ng, \u0111\u1ec3 b\u1ea1n v\u1eeba c\u00f3 th\u1ec3 h\u1ecdc l\u00fd thuy\u1ebft, v\u1eeba th\u1ef1c h\u00e0nh ngay v\u00e0o d\u1ef1 \u00e1n th\u1ef1c t\u1ebf.<\/p>\n\n\n\n

1. T\u1ed5ng quan v\u1ec1 thao t\u00e1c ghi file trong Python<\/h2>\n\n\n\n

Trong Python, thao t\u00e1c c\u01a1 b\u1ea3n v\u1edbi file bao g\u1ed3m: m\u1edf file (open)<\/strong> \u2192 ghi (write)<\/strong> \u2192 \u0111\u00f3ng (close)<\/strong>. H\u00e0m open()<\/code> tr\u1ea3 v\u1ec1 m\u1ed9t object file, tr\u00ean \u0111\u00f3 b\u1ea1n g\u1ecdi write()<\/code> ho\u1eb7c writelines()<\/code> \u0111\u1ec3 ghi d\u1eef li\u1ec7u.<\/p>\n\n\n\n

C\u00e1c ch\u1ebf \u0111\u1ed9 m\u1edf file quan tr\u1ecdng:<\/p>\n\n\n\n

    \n
  • \"w\"<\/code> \u2014 write: t\u1ea1o m\u1edbi file ho\u1eb7c x\u00f3a n\u1ed9i dung c\u0169 r\u1ed3i ghi m\u1edbi.<\/li>\n\n\n\n
  • \"a\"<\/code> \u2014 append: m\u1edf file \u0111\u1ec3 th\u00eam v\u00e0o cu\u1ed1i; n\u1ebfu file ch\u01b0a t\u1ed3n t\u1ea1i th\u00ec t\u1ea1o m\u1edbi.<\/li>\n\n\n\n
  • \"x\"<\/code> \u2014 exclusive creation: t\u1ea1o file m\u1edbi; n\u1ebfu file \u0111\u00e3 t\u1ed3n t\u1ea1i \u2192 l\u1ed7i.<\/li>\n\n\n\n
  • Ch\u1ebf \u0111\u1ed9 nh\u1ecb ph\u00e2n: \"wb\"<\/code>, \"ab\"<\/code>, \"xb\"<\/code> d\u00f9ng \u0111\u1ec3 ghi d\u1eef li\u1ec7u bytes.<\/li>\n<\/ul>\n\n\n\n

    Ngo\u00e0i ra c\u00f2n c\u00f3 r+<\/code>, w+<\/code>… cho c\u1ea3 \u0111\u1ecdc v\u00e0 ghi c\u00f9ng l\u00fac. Kh\u00e1c bi\u1ec7t gi\u1eefa text mode v\u00e0 binary mode l\u00e0: text mode thao t\u00e1c chu\u1ed7i (str<\/code>) v\u1edbi encoding, binary mode thao t\u00e1c bytes<\/code> kh\u00f4ng ch\u1ecbu \u1ea3nh h\u01b0\u1edfng encoding.<\/p>\n\n\n\n

    2. M\u1edf file \u0111\u1ec3 ghi b\u1eb1ng h\u00e0m open()<\/code><\/h2>\n\n\n\n

    C\u00fa ph\u00e1p c\u01a1 b\u1ea3n:<\/p>\n\n\n\n

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