{"id":970729,"date":"2024-12-27T05:28:36","date_gmt":"2024-12-26T21:28:36","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/970729.html"},"modified":"2024-12-27T05:28:38","modified_gmt":"2024-12-26T21:28:38","slug":"python%e4%b8%ad%e5%a6%82%e4%bd%95%e8%bf%bd%e5%8a%a0%e6%96%87%e4%bb%b6","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/970729.html","title":{"rendered":"python\u4e2d\u5982\u4f55\u8ffd\u52a0\u6587\u4ef6"},"content":{"rendered":"

\"python\u4e2d\u5982\u4f55\u8ffd\u52a0\u6587\u4ef6\"<\/p>\n

\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u8ffd\u52a0\u6587\u4ef6\uff0c\u4e3b\u8981\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528\u5185\u7f6e\u7684open()\u51fd\u6570\u3001with\u8bed\u53e5\u3001writelines()\u65b9\u6cd5\u548c\u7b2c\u4e09\u65b9\u5e93\u7684\u652f\u6301<\/strong>\u3002\u4f7f\u7528open()\u51fd\u6570\u662f\u6700\u76f4\u63a5\u7684\u65b9\u5f0f\uff0c\u5b83\u5141\u8bb8\u6211\u4eec\u4ee5\u4e0d\u540c\u6a21\u5f0f\u6253\u5f00\u6587\u4ef6\uff0c\u2018a\u2019\u6a21\u5f0f\u7528\u4e8e\u8ffd\u52a0\u5185\u5bb9\u3002\u4e0b\u9762\u6211\u4eec\u5c06\u6df1\u5165\u63a2\u8ba8\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u5e76\u7ed3\u5408\u5b9e\u8df5\uff0c\u5e2e\u52a9\u4f60\u66f4\u597d\u5730\u7406\u89e3\u5982\u4f55\u5728Python\u4e2d\u8ffd\u52a0\u6587\u4ef6\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528OPEN()\u51fd\u6570\u8ffd\u52a0\u6587\u4ef6<\/p>\n<\/p>\n

\u5728Python\u4e2d\uff0copen()\u51fd\u6570\u662f\u5904\u7406\u6587\u4ef6\u7684\u57fa\u7840\u65b9\u6cd5\u4e4b\u4e00\uff0c\u5b83\u5141\u8bb8\u6211\u4eec\u4ee5\u4e0d\u540c\u7684\u6a21\u5f0f\u6253\u5f00\u6587\u4ef6\u3002\u8ffd\u52a0\u6587\u4ef6\u65f6\uff0c\u4f7f\u7528\u2018a\u2019\u6a21\u5f0f\uff0c\u5373append\u6a21\u5f0f\u3002\u8fd9\u6837\uff0c\u4efb\u4f55\u5199\u5165\u6587\u4ef6\u7684\u64cd\u4f5c\u90fd\u4f1a\u9644\u52a0\u5230\u6587\u4ef6\u7684\u672b\u5c3e\uff0c\u800c\u4e0d\u4f1a\u8986\u76d6\u539f\u6709\u5185\u5bb9\u3002<\/p>\n<\/p>\n

# \u4f7f\u7528 open() \u51fd\u6570\u8ffd\u52a0\u6587\u4ef6<\/p>\n
with open('example.txt', 'a') as file:<\/p>\n
    file.write('This is an additional line.\\n')<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528open()\u51fd\u6570\u4ee5\u8ffd\u52a0\u6a21\u5f0f\u6253\u5f00\u6587\u4ef6example.txt\uff0c\u5e76\u5728\u6587\u4ef6\u672b\u5c3e\u6dfb\u52a0\u4e86\u4e00\u884c\u65b0\u7684\u6587\u672c\u3002<\/strong>\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u5728\u4e8e\u7b80\u5355\u76f4\u63a5\uff0c\u9002\u5408\u5904\u7406\u4e0d\u9700\u8981\u590d\u6742\u64cd\u4f5c\u7684\u6587\u4ef6\u8ffd\u52a0\u4efb\u52a1\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528WITH\u8bed\u53e5\u7ba1\u7406\u6587\u4ef6\u8d44\u6e90<\/p>\n<\/p>\n
\u4f7f\u7528with\u8bed\u53e5\u53ef\u4ee5\u66f4\u597d\u5730\u7ba1\u7406\u6587\u4ef6\u8d44\u6e90\u3002with\u8bed\u53e5\u4f1a\u81ea\u52a8\u5904\u7406\u6587\u4ef6\u7684\u6253\u5f00\u548c\u5173\u95ed\uff0c\u907f\u514d\u56e0\u5fd8\u8bb0\u5173\u95ed\u6587\u4ef6\u800c\u5bfc\u81f4\u7684\u8d44\u6e90\u6cc4\u6f0f\u95ee\u9898\u3002\u56e0\u6b64\uff0c\u63a8\u8350\u4f7f\u7528with\u8bed\u53e5\u6765\u7ba1\u7406\u6587\u4ef6\u7684\u8bfb\u5199\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
# \u4f7f\u7528 with \u8bed\u53e5\u8ffd\u52a0\u6587\u4ef6<\/p>\n
with open('example.txt', 'a') as file:<\/p>\n
    file.write('Appending another line.\\n')<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u4f7f\u7528with\u8bed\u53e5\uff0c\u6211\u4eec\u786e\u4fdd\u6587\u4ef6\u5728\u64cd\u4f5c\u5b8c\u6210\u540e\u88ab\u6b63\u786e\u5173\u95ed\uff0c\u65e0\u9700\u663e\u5f0f\u8c03\u7528close()\u65b9\u6cd5\u3002<\/strong>\u8fd9\u4e0d\u4ec5\u63d0\u9ad8\u4e86\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\uff0c\u8fd8\u51cf\u5c11\u4e86\u51fa\u9519\u7684\u53ef\u80fd\u6027\uff0c\u662f\u5904\u7406\u6587\u4ef6\u64cd\u4f5c\u7684\u6700\u4f73\u5b9e\u8df5\u4e4b\u4e00\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528WRITELINES()\u65b9\u6cd5\u8ffd\u52a0\u591a\u884c<\/p>\n<\/p>\n
\u5bf9\u4e8e\u9700\u8981\u8ffd\u52a0\u591a\u884c\u5185\u5bb9\u7684\u60c5\u51b5\uff0c\u53ef\u4ee5\u4f7f\u7528writelines()\u65b9\u6cd5\u3002writelines()\u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u5b57\u7b26\u4e32\u5217\u8868\uff0c\u5c06\u5217\u8868\u4e2d\u7684\u6bcf\u4e2a\u5b57\u7b26\u4e32\u4f9d\u6b21\u5199\u5165\u6587\u4ef6\u3002\u6bcf\u4e2a\u5b57\u7b26\u4e32\u9700\u8981\u81ea\u884c\u5305\u542b\u6362\u884c\u7b26\u3002<\/p>\n<\/p>\n
# \u4f7f\u7528 writelines() \u65b9\u6cd5\u8ffd\u52a0\u591a\u884c<\/p>\n
lines_to_append = ['First additional line.\\n', 'Second additional line.\\n']<\/p>\n
with open('example.txt', 'a') as file:<\/p>\n
    file.writelines(lines_to_append)<\/p>\n
<\/code><\/pre>\n<\/p>\n
writelines()\u65b9\u6cd5\u9002\u5408\u5904\u7406\u9700\u8981\u8ffd\u52a0\u591a\u884c\u7684\u573a\u666f\uff0c\u80fd\u591f\u4e00\u6b21\u6027\u5199\u5165\u591a\u4e2a\u5b57\u7b26\u4e32\uff0c\u63d0\u9ad8\u4ee3\u7801\u7684\u6548\u7387\u3002<\/strong>\u5728\u4f7f\u7528writelines()\u65f6\uff0c\u9700\u8981\u6ce8\u610f\u5b57\u7b26\u4e32\u672c\u8eab\u662f\u5426\u5305\u542b\u6362\u884c\u7b26\uff0c\u4ee5\u786e\u4fdd\u6bcf\u884c\u5185\u5bb9\u6b63\u786e\u5206\u9694\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93\u8fdb\u884c\u6587\u4ef6\u64cd\u4f5c<\/p>\n<\/p>\n
Python\u751f\u6001\u7cfb\u7edf\u4e2d\u6709\u8bb8\u591a\u7b2c\u4e09\u65b9\u5e93\u53ef\u4ee5\u8f85\u52a9\u8fdb\u884c\u6587\u4ef6\u64cd\u4f5c\uff0c\u63d0\u4f9b\u66f4\u591a\u529f\u80fd\u548c\u4fbf\u5229\u3002\u4f8b\u5982\uff0cpandas\u5e93\u4e0d\u4ec5\u53ef\u4ee5\u7528\u4e8e\u6570\u636e\u5206\u6790\uff0c\u8fd8\u53ef\u4ee5\u8f7b\u677e\u5904\u7406CSV\u6587\u4ef6\u7684\u8bfb\u5199\u64cd\u4f5c\u3002\u5bf9\u4e8e\u8ffd\u52a0\u6570\u636e\u5230CSV\u6587\u4ef6\u7684\u573a\u666f\uff0cpandas\u5e93\u63d0\u4f9b\u4e86\u7b80\u6d01\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<\/p>\n
import pandas as pd<\/p>\n
\u4f7f\u7528 pandas \u8ffd\u52a0CSV\u6587\u4ef6<\/strong><\/h2>\n
data = {'Column1': [1, 2], 'Column2': [3, 4]}<\/p>\n
df = pd.DataFrame(data)<\/p>\n
df.to_csv('example.csv', mode='a', header=False, index=False)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7pandas\u5e93\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u5c06DataFrame\u8ffd\u52a0\u5230CSV\u6587\u4ef6\u4e2d\uff0c\u652f\u6301\u66f4\u591a\u6570\u636e\u683c\u5f0f\u548c\u590d\u6742\u6570\u636e\u64cd\u4f5c\u3002<\/strong>\u8fd9\u5bf9\u4e8e\u6570\u636e\u5206\u6790\u548c\u5904\u7406\u4efb\u52a1\u5c24\u4e3a\u4fbf\u5229\uff0c\u80fd\u591f\u6709\u6548\u5229\u7528pandas\u7684\u5f3a\u5927\u529f\u80fd\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u8ffd\u52a0\u6587\u4ef6\u7684\u6ce8\u610f\u4e8b\u9879<\/p>\n<\/p>\n
\u5728\u8fdb\u884c\u6587\u4ef6\u8ffd\u52a0\u64cd\u4f5c\u65f6\uff0c\u6709\u51e0\u4e2a\u91cd\u8981\u7684\u6ce8\u610f\u4e8b\u9879\u9700\u8981\u7262\u8bb0\uff0c\u4ee5\u786e\u4fdd\u6587\u4ef6\u64cd\u4f5c\u7684\u5b89\u5168\u6027\u548c\u6570\u636e\u5b8c\u6574\u6027\u3002<\/p>\n<\/p>\n
    \n
  1. \n
    \u6587\u4ef6\u6a21\u5f0f\u9009\u62e9<\/strong>\uff1a\u786e\u4fdd\u4f7f\u7528\u6b63\u786e\u7684\u6587\u4ef6\u6a21\u5f0f\u8fdb\u884c\u8ffd\u52a0\u64cd\u4f5c\u3002\u2018a\u2019\u6a21\u5f0f\u7528\u4e8e\u8ffd\u52a0\uff0c\u2018w\u2019\u6a21\u5f0f\u7528\u4e8e\u8986\u76d6\uff0c\u9009\u62e9\u9519\u8bef\u6a21\u5f0f\u53ef\u80fd\u5bfc\u81f4\u6570\u636e\u4e22\u5931\u3002<\/p>\n<\/p>\n<\/li>\n
  2. \n
    \u6587\u4ef6\u7f16\u7801\u95ee\u9898<\/strong>\uff1a\u5728\u5904\u7406\u5305\u542b\u975eASCII\u5b57\u7b26\u7684\u6587\u4ef6\u65f6\uff0c\u786e\u4fdd\u6307\u5b9a\u6b63\u786e\u7684\u6587\u4ef6\u7f16\u7801\uff0c\u5982UTF-8\uff0c\u4ee5\u907f\u514d\u5b57\u7b26\u7f16\u7801\u9519\u8bef\u3002<\/p>\n<\/p>\n<\/li>\n
  3. \n
    \u5f02\u5e38\u5904\u7406<\/strong>\uff1a\u5728\u6587\u4ef6\u64cd\u4f5c\u4e2d\u52a0\u5165\u5f02\u5e38\u5904\u7406\u903b\u8f91\uff0c\u6355\u83b7\u53ef\u80fd\u51fa\u73b0\u7684IOError\u7b49\u5f02\u5e38\uff0c\u786e\u4fdd\u7a0b\u5e8f\u7684\u5065\u58ee\u6027\u3002<\/p>\n<\/p>\n<\/li>\n
  4. \n
    \u8d44\u6e90\u7ba1\u7406<\/a><\/strong>\uff1a\u4f7f\u7528with\u8bed\u53e5\u7ba1\u7406\u6587\u4ef6\u8d44\u6e90\uff0c\u786e\u4fdd\u6587\u4ef6\u5728\u64cd\u4f5c\u5b8c\u6210\u540e\u88ab\u6b63\u786e\u5173\u95ed\uff0c\u907f\u514d\u8d44\u6e90\u6cc4\u6f0f\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n
    \u901a\u8fc7\u638c\u63e1\u8fd9\u4e9b\u6587\u4ef6\u8ffd\u52a0\u65b9\u6cd5\u548c\u6ce8\u610f\u4e8b\u9879\uff0c\u4f60\u53ef\u4ee5\u5728Python\u4e2d\u66f4\u9ad8\u6548\u5730\u8fdb\u884c\u6587\u4ef6\u64cd\u4f5c\uff0c\u5904\u7406\u5404\u79cd\u6587\u4ef6\u8ffd\u52a0\u4efb\u52a1\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u6839\u636e\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u548c\u5de5\u5177\uff0c\u786e\u4fdd\u6587\u4ef6\u64cd\u4f5c\u7684\u6b63\u786e\u6027\u548c\u6570\u636e\u7684\u5b8c\u6574\u6027\u3002<\/p>\n<\/p>\n
    \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
     \u5982\u4f55\u5728Python\u4e2d\u4f7f\u7528\u8ffd\u52a0\u6a21\u5f0f\u6253\u5f00\u6587\u4ef6\uff1f<\/strong>
    \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u7684open()<\/code>\u51fd\u6570\u4ee5\u8ffd\u52a0\u6a21\u5f0f\u6253\u5f00\u6587\u4ef6\u3002\u901a\u8fc7\u5c06\u6a21\u5f0f\u8bbe\u7f6e\u4e3a'a'<\/code>\uff0c\u53ef\u4ee5\u5728\u6587\u4ef6\u672b\u5c3e\u6dfb\u52a0\u5185\u5bb9\uff0c\u800c\u4e0d\u4f1a\u8986\u76d6\u73b0\u6709\u6570\u636e\u3002\u4f8b\u5982\uff0cwith open('file.txt', 'a') as f:<\/code>\u5c06\u4ee5\u8ffd\u52a0\u6a21\u5f0f\u6253\u5f00file.txt<\/code>\u6587\u4ef6\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528f.write('\u65b0\u5185\u5bb9')<\/code>\u5c06\u65b0\u6570\u636e\u6dfb\u52a0\u5230\u6587\u4ef6\u4e2d\u3002<\/p>\n
    \u5728\u8ffd\u52a0\u6587\u4ef6\u65f6\uff0c\u6211\u53ef\u4ee5\u4f7f\u7528\u54ea\u4e9b\u65b9\u6cd5\uff1f<\/strong>
    \u9664\u4e86write()<\/code>\u65b9\u6cd5\u5916\uff0c\u60a8\u8fd8\u53ef\u4ee5\u4f7f\u7528writelines()<\/code>\u65b9\u6cd5\u5c06\u591a\u4e2a\u5b57\u7b26\u4e32\u5199\u5165\u6587\u4ef6\u3002\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u6709\u4e00\u4e2a\u5b57\u7b26\u4e32\u5217\u8868\uff0c\u53ef\u4ee5\u901a\u8fc7f.writelines(['\u884c1\\n', '\u884c2\\n'])<\/code>\u5c06\u6240\u6709\u884c\u8ffd\u52a0\u5230\u6587\u4ef6\u4e2d\u3002\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u6548\u7387\uff0c\u7279\u522b\u662f\u5728\u5904\u7406\u591a\u884c\u6570\u636e\u65f6\u3002<\/p>\n
    \u5982\u4f55\u786e\u4fdd\u5728\u8ffd\u52a0\u6587\u4ef6\u65f6\u4e0d\u4f1a\u5f15\u53d1\u9519\u8bef\uff1f<\/strong>
    \u5728\u8fdb\u884c\u6587\u4ef6\u8ffd\u52a0\u64cd\u4f5c\u65f6\uff0c\u786e\u4fdd\u5904\u7406\u5f02\u5e38\u60c5\u51b5\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u4f7f\u7528try-except<\/code>\u5757\u53ef\u4ee5\u6355\u83b7\u6f5c\u5728\u7684IOError\u6216\u5176\u4ed6\u5f02\u5e38\uff0c\u786e\u4fdd\u7a0b\u5e8f\u5728\u51fa\u73b0\u95ee\u9898\u65f6\u4e0d\u4f1a\u5d29\u6e83\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u8fd9\u6837\u505a\uff1a  <\/p>\n
    try:\n    with open('file.txt', 'a') as f:\n        f.write('\u65b0\u5185\u5bb9')\nexcept IOError as e:\n    print(f'\u6587\u4ef6\u64cd\u4f5c\u5931\u8d25: {e}')\n<\/code><\/pre>\n
    \u8fd9\u79cd\u65b9\u5f0f\u53ef\u4ee5\u5e2e\u52a9\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u6587\u4ef6\u64cd\u4f5c\u4e2d\u7684\u610f\u5916\u60c5\u51b5\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u8ffd\u52a0\u6587\u4ef6\uff0c\u4e3b\u8981\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528\u5185\u7f6e\u7684open()\u51fd\u6570\u3001with\u8bed\u53e5\u3001writel […]","protected":false},"author":3,"featured_media":970739,"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\/970729"}],"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=970729"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/970729\/revisions"}],"predecessor-version":[{"id":970740,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/970729\/revisions\/970740"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/970739"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=970729"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=970729"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=970729"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}