{"id":993586,"date":"2024-12-27T08:47:16","date_gmt":"2024-12-27T00:47:16","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/993586.html"},"modified":"2024-12-27T08:47:18","modified_gmt":"2024-12-27T00:47:18","slug":"python-%e5%a6%82%e4%bd%95%e6%b8%85%e7%a9%ba%e6%96%87%e4%bb%b6","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/993586.html","title":{"rendered":"python \u5982\u4f55\u6e05\u7a7a\u6587\u4ef6"},"content":{"rendered":"

\"python<\/p>\n

\u5728Python\u4e2d\u6e05\u7a7a\u6587\u4ef6\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\u5b9e\u73b0\uff1a\u4f7f\u7528\u6587\u4ef6\u5199\u5165\u6a21\u5f0f 'w'\u3001\u4f7f\u7528\u6587\u4ef6\u622a\u65ad\u65b9\u6cd5 truncate()\u3001\u4f7f\u7528 os \u6a21\u5757\u4e2d\u7684 remove() \u65b9\u6cd5\u5220\u9664\u540e\u91cd\u65b0\u521b\u5efa\u3002<\/strong>\u5176\u4e2d\uff0c\u6700\u5e38\u7528\u7684\u662f\u4f7f\u7528\u6587\u4ef6\u5199\u5165\u6a21\u5f0f 'w'\uff0c\u56e0\u4e3a\u8fd9\u79cd\u65b9\u6cd5\u7b80\u5355\u76f4\u63a5\u3002\u901a\u8fc7\u4f7f\u7528 'w' \u6a21\u5f0f\u6253\u5f00\u6587\u4ef6\uff0cPython \u4f1a\u81ea\u52a8\u6e05\u7a7a\u6587\u4ef6\u5185\u5bb9\u5e76\u51c6\u5907\u5199\u5165\u65b0\u7684\u6570\u636e\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u8ba8\u8bba\u8fd9\u4e9b\u65b9\u6cd5\u53ca\u5176\u5b9e\u73b0\u7ec6\u8282\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528\u6587\u4ef6\u5199\u5165\u6a21\u5f0f 'w'<\/p>\n<\/p>\n

\u4f7f\u7528\u6587\u4ef6\u5199\u5165\u6a21\u5f0f 'w' \u662f\u6e05\u7a7a\u6587\u4ef6\u7684\u6700\u7b80\u5355\u65b9\u6cd5\u3002\u6253\u5f00\u6587\u4ef6\u65f6\uff0c\u6587\u4ef6\u7684\u5185\u5bb9\u5c06\u88ab\u6e05\u7a7a\u3002\u5982\u679c\u6587\u4ef6\u4e0d\u5b58\u5728\uff0c\u5c06\u4f1a\u88ab\u521b\u5efa\u3002\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u6e05\u7a7a\u6587\u4ef6\u5e76\u51c6\u5907\u5199\u5165\u65b0\u6570\u636e\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n

with open('filename.txt', 'w') as file:<\/p>\n
    pass<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u4f7f\u7528 with open<\/code> \u6253\u5f00\u6587\u4ef6 'filename.txt'\uff0c\u5e76\u6307\u5b9a\u6a21\u5f0f\u4e3a 'w'\u3002\u7531\u4e8e\u6ca1\u6709\u6267\u884c\u5199\u64cd\u4f5c\uff0c\u6587\u4ef6\u5c06\u88ab\u6e05\u7a7a\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528\u6587\u4ef6\u622a\u65ad\u65b9\u6cd5 truncate()<\/p>\n<\/p>\n
truncate()<\/code> \u65b9\u6cd5\u53ef\u4ee5\u7528\u6765\u6e05\u7a7a\u6587\u4ef6\u3002\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u6587\u4ef6\u5df2\u7ecf\u6253\u5f00\u5e76\u5e0c\u671b\u4fdd\u7559\u6587\u4ef6\u53e5\u67c4\u7684\u60c5\u51b5\u4e0b\u3002\u901a\u8fc7\u8c03\u7528 truncate(0)<\/code>\uff0c\u53ef\u4ee5\u5c06\u6587\u4ef6\u7684\u5927\u5c0f\u622a\u65ad\u4e3a\u96f6\uff0c\u4ece\u800c\u6e05\u7a7a\u6587\u4ef6\u5185\u5bb9\u3002<\/p>\n<\/p>\n
with open('filename.txt', 'r+') as file:<\/p>\n
    file.truncate(0)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u6b64\u4ee3\u7801\u4e2d\uff0c\u6587\u4ef6 'filename.txt' \u4ee5 'r+' \u6a21\u5f0f\u6253\u5f00\uff0c\u8be5\u6a21\u5f0f\u5141\u8bb8\u8bfb\u5199\u64cd\u4f5c\u3002\u8c03\u7528 file.truncate(0)<\/code> \u5c06\u6587\u4ef6\u5185\u5bb9\u6e05\u7a7a\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528 os \u6a21\u5757\u4e2d\u7684 remove() \u65b9\u6cd5\u5220\u9664\u540e\u91cd\u65b0\u521b\u5efa<\/p>\n<\/p>\n
\u901a\u8fc7\u5220\u9664\u6587\u4ef6\u5e76\u91cd\u65b0\u521b\u5efa\u4e00\u4e2a\u540c\u540d\u6587\u4ef6\uff0c\u4e5f\u53ef\u4ee5\u8fbe\u5230\u6e05\u7a7a\u6587\u4ef6\u7684\u76ee\u7684\u3002\u6b64\u65b9\u6cd5\u5728\u9700\u8981\u786e\u4fdd\u6587\u4ef6\u5185\u5bb9\u5b8c\u5168\u79fb\u9664\u7684\u60c5\u51b5\u4e0b\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n
import os<\/p>\n
filename = 'filename.txt'<\/p>\n
\u5220\u9664\u6587\u4ef6<\/strong><\/h2>\n
os.remove(filename)<\/p>\n
\u91cd\u65b0\u521b\u5efa\u6587\u4ef6<\/strong><\/h2>\n
with open(filename, 'w') as file:<\/p>\n
    pass<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u91cc\uff0c\u4f7f\u7528 os.remove()<\/code> \u5220\u9664\u6307\u5b9a\u7684\u6587\u4ef6\uff0c\u7136\u540e\u901a\u8fc7\u6253\u5f00\u6587\u4ef6\u7684 'w' \u6a21\u5f0f\u91cd\u65b0\u521b\u5efa\u4e00\u4e2a\u7a7a\u6587\u4ef6\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528 pathlib \u6a21\u5757\u6e05\u7a7a\u6587\u4ef6<\/p>\n<\/p>\n
pathlib<\/code> \u662f Python 3.4 \u5f15\u5165\u7684\u6a21\u5757\uff0c\u63d0\u4f9b\u4e86\u9762\u5411\u5bf9\u8c61\u7684\u6587\u4ef6\u7cfb\u7edf\u8def\u5f84\u64cd\u4f5c\u3002\u4f7f\u7528 pathlib<\/code> \u4e5f\u53ef\u4ee5\u65b9\u4fbf\u5730\u6e05\u7a7a\u6587\u4ef6\u3002<\/p>\n<\/p>\n
from pathlib import Path<\/p>\n
file_path = Path('filename.txt')<\/p>\n
\u6e05\u7a7a\u6587\u4ef6<\/strong><\/h2>\n
file_path.write_text('')<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u4f7f\u7528 Path()<\/code> \u521b\u5efa\u6587\u4ef6\u8def\u5f84\u5bf9\u8c61\uff0c\u7136\u540e\u8c03\u7528 write_text('')<\/code> \u65b9\u6cd5\u6e05\u7a7a\u6587\u4ef6\u5185\u5bb9\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u8003\u8651\u6587\u4ef6\u6e05\u7a7a\u7684\u573a\u666f\u548c\u5b89\u5168\u6027<\/p>\n<\/p>\n
\u5728\u6e05\u7a7a\u6587\u4ef6\u65f6\uff0c\u9700\u8981\u8003\u8651\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n<\/p>\n
    \n
  1. \n
    \u6570\u636e\u5907\u4efd<\/strong>\uff1a\u6e05\u7a7a\u6587\u4ef6\u4f1a\u5bfc\u81f4\u6570\u636e\u4e22\u5931\uff0c\u56e0\u6b64\u5728\u6267\u884c\u6b64\u64cd\u4f5c\u524d\uff0c\u8bf7\u786e\u4fdd\u6570\u636e\u5df2\u7ecf\u5907\u4efd\u6216\u786e\u8ba4\u6570\u636e\u4e0d\u518d\u9700\u8981\u3002<\/p>\n<\/p>\n<\/li>\n
  2. \n
    \u6587\u4ef6\u9501\u5b9a<\/strong>\uff1a\u5728\u67d0\u4e9b\u64cd\u4f5c\u7cfb\u7edf\u4e2d\uff0c\u6587\u4ef6\u53ef\u80fd\u4f1a\u88ab\u5176\u4ed6\u8fdb\u7a0b\u9501\u5b9a\uff0c\u5bfc\u81f4\u65e0\u6cd5\u6e05\u7a7a\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u786e\u4fdd\u6587\u4ef6\u672a\u88ab\u5176\u4ed6\u8fdb\u7a0b\u4f7f\u7528\u3002<\/p>\n<\/p>\n<\/li>\n
  3. \n
    \u6743\u9650\u95ee\u9898<\/strong>\uff1a\u786e\u4fdd\u8fd0\u884c\u811a\u672c\u7684\u7528\u6237\u5177\u6709\u5bf9\u76ee\u6807\u6587\u4ef6\u7684\u5199\u6743\u9650\uff0c\u5426\u5219\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6743\u9650\u9519\u8bef\u3002<\/p>\n<\/p>\n<\/li>\n
  4. \n
    \u9519\u8bef\u5904\u7406<\/strong>\uff1a\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5efa\u8bae\u6dfb\u52a0\u9519\u8bef\u5904\u7406\u673a\u5236\uff0c\u4ee5\u5e94\u5bf9\u53ef\u80fd\u7684\u5f02\u5e38\u60c5\u51b5\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 try-except \u8bed\u53e5\u6355\u83b7\u5e76\u5904\u7406\u6587\u4ef6\u64cd\u4f5c\u4e2d\u7684\u5f02\u5e38\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n
    \u516d\u3001\u603b\u7ed3<\/p>\n<\/p>\n
    \u5728 Python \u4e2d\uff0c\u6e05\u7a7a\u6587\u4ef6\u6709\u591a\u79cd\u65b9\u6cd5\u53ef\u4f9b\u9009\u62e9\uff0c\u5305\u62ec\u4f7f\u7528\u6587\u4ef6\u5199\u5165\u6a21\u5f0f 'w'\u3001\u6587\u4ef6\u622a\u65ad\u65b9\u6cd5 truncate()\u3001\u5220\u9664\u540e\u91cd\u65b0\u521b\u5efa\u6587\u4ef6\u7b49\u3002\u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u9002\u7528\u7684\u573a\u666f\u548c\u4f18\u52bf\u3002\u5728\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u65f6\uff0c\u9700\u6839\u636e\u5b9e\u9645\u9700\u6c42\u8003\u8651\u6570\u636e\u5907\u4efd\u3001\u5b89\u5168\u6027\u53ca\u6743\u9650\u95ee\u9898\u3002\u901a\u8fc7\u5408\u7406\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u6e05\u7a7a\u6587\u4ef6\u5185\u5bb9\u3002<\/p>\n<\/p>\n
    \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
     \u5982\u4f55\u5728Python\u4e2d\u6e05\u7a7a\u4e00\u4e2a\u6587\u4ef6\u800c\u4e0d\u5220\u9664\u5b83\uff1f<\/strong>
    \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u6253\u5f00\u6587\u4ef6\u5e76\u4f7f\u7528\u5199\u5165\u6a21\u5f0f\u6765\u6e05\u7a7a\u6587\u4ef6\u5185\u5bb9\u3002\u4f7f\u7528open()<\/code>\u51fd\u6570\u65f6\uff0c\u5c06\u6a21\u5f0f\u8bbe\u7f6e\u4e3a'w'<\/code>\uff0c\u8fd9\u4f1a\u8986\u76d6\u6587\u4ef6\u7684\u73b0\u6709\u5185\u5bb9\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
    with open('example.txt', 'w') as file:\n    pass  # \u53ea\u6253\u5f00\u6587\u4ef6\u5e76\u7acb\u5373\u5173\u95ed\n<\/code><\/pre>\n
    \u8fd9\u6837\uff0cexample.txt<\/code>\u4e2d\u7684\u5185\u5bb9\u5c06\u88ab\u6e05\u7a7a\u3002<\/p>\n
    \u6e05\u7a7a\u6587\u4ef6\u5185\u5bb9\u540e\u5982\u4f55\u786e\u8ba4\u6587\u4ef6\u5df2\u6210\u529f\u6e05\u7a7a\uff1f<\/strong>
    \u5728\u6e05\u7a7a\u6587\u4ef6\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\u6765\u786e\u8ba4\u662f\u5426\u6210\u529f\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528read()<\/code>\u65b9\u6cd5\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\u5e76\u68c0\u67e5\u8fd4\u56de\u503c\u662f\u5426\u4e3a\u7a7a\uff1a<\/p>\n
    with open('example.txt', 'r') as file:\n    content = file.read()\n    if content == '':\n        print("\u6587\u4ef6\u5df2\u6210\u529f\u6e05\u7a7a\u3002")\n<\/code><\/pre>\n
    \u4f7f\u7528Python\u6e05\u7a7a\u6587\u4ef6\u65f6\u4f1a\u4e0d\u4f1a\u5f71\u54cd\u6587\u4ef6\u7684\u6743\u9650\u6216\u5176\u4ed6\u5c5e\u6027\uff1f<\/strong>
    \u6e05\u7a7a\u6587\u4ef6\u7684\u8fc7\u7a0b\u4e0d\u4f1a\u6539\u53d8\u6587\u4ef6\u7684\u6743\u9650\u6216\u5176\u4ed6\u5c5e\u6027\u3002\u6253\u5f00\u6587\u4ef6\u5e76\u4ee5\u5199\u5165\u6a21\u5f0f\uff08'w'<\/code>\uff09\u6253\u5f00\u65f6\uff0c\u4ec5\u5f71\u54cd\u6587\u4ef6\u7684\u5185\u5bb9\u3002\u6587\u4ef6\u7684\u521b\u5efa\u65f6\u95f4\u3001\u4fee\u6539\u65f6\u95f4\u548c\u6743\u9650\u90fd\u5c06\u4fdd\u6301\u4e0d\u53d8\u3002\u5982\u679c\u9700\u8981\u4fdd\u7559\u6587\u4ef6\u7684\u6240\u6709\u5c5e\u6027\uff0c\u786e\u4fdd\u4e0d\u8981\u4f7f\u7528\u5220\u9664\u64cd\u4f5c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\u6e05\u7a7a\u6587\u4ef6\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\u5b9e\u73b0\uff1a\u4f7f\u7528\u6587\u4ef6\u5199\u5165\u6a21\u5f0f 'w'\u3001\u4f7f\u7528\u6587\u4ef6\u622a\u65ad\u65b9\u6cd5 […]","protected":false},"author":3,"featured_media":993597,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/993586"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=993586"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/993586\/revisions"}],"predecessor-version":[{"id":993599,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/993586\/revisions\/993599"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/993597"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=993586"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=993586"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=993586"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}