{"id":110528,"date":"2026-09-28T21:49:01","date_gmt":"2026-09-28T13:49:01","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/110528.html"},"modified":"2026-09-28T21:49:01","modified_gmt":"2026-09-28T13:49:01","slug":"pandas-read_csv-%e5%ae%9e%e6%b5%8b%ef%bc%9a6-%e4%b8%aa%e5%90%8d%e5%ad%97%e5%90%9e%e6%8e%89-5-%e4%b8%aa%ef%bc%8c25kb-%e7%9a%84%e6%96%87%e4%bb%b6%e5%ae%83%e8%a6%81%e8%b7%91-0-64-%e7%a7%92","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/110528.html","title":{"rendered":"pandas read_csv \u5b9e\u6d4b\uff1a6 \u4e2a\u540d\u5b57\u541e\u6389 5 \u4e2a\uff0c25KB \u7684\u6587\u4ef6\u5b83\u8981\u8dd1 0.64 \u79d2"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260928134854-6aba7046bfc50.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u8fd9\u4e2a\u680f\u76ee\u5199\u9999\u6e2f\u516c\u5f00\u6570\u636e\u5199\u4e86\u4e09\u5341\u591a\u7bc7&#xff0c;\u8bc4\u8bba\u533a\u9694\u4e09\u5dee\u4e94\u6709\u4eba\u95ee\u540c\u4e00\u4e2a\u95ee\u9898&#xff1a;\u4e3a\u4ec0\u4e48\u4e0d\u76f4\u63a5\u7528 pandas&#xff1f;\u7b54\u6848\u5f88\u4fd7\u2014\u2014\u6211\u4e00\u5f00\u59cb\u4e5f\u7528&#xff0c;\u662f\u88ab\u5b83\u7684\u9ed8\u8ba4\u884c\u4e3a\u5751\u51fa\u6765\u7684\u300263 \u4e2a\u5ba1\u8ba1\u811a\u672c\u91cc\u6700\u540e\u6709 35 \u5904\u624b\u5199 csv.reader&#xff0c;\u4eca\u5929\u5e72\u8106\u628a\u8fd9\u7b14\u8d26\u7b97\u6e05\u695a&#xff1a;\u62ff\u4e24\u4efd\u771f\u5b9e\u7684\u9999\u6e2f\u5b98\u65b9 CSV&#xff08;\u5dee\u9977\u7269\u4e1a\u4f30\u4ef7\u7f72\u7684\u6708\u5ea6\/\u5e74\u5ea6\u697c\u4ef7\u6307\u6570&#xff09;&#xff0c;\u628a read_csv \u66ff\u4f60\u505a\u7684\u90a3\u4e9b\u51b3\u5b9a\u9010\u6761\u5b9e\u6d4b\u4e00\u904d\u3002<\/p>\n<\/p>\n<h4>\u76ee\u5f55<\/h4>\n<ul>\n<li>\n<ul>\n<li>\u4e00\u3001\u5b83\u9ed8\u8ba4\u541e\u6389\u8fd9 19 \u79cd\u5b57\u7b26\u4e32<\/li>\n<li>\u4e8c\u3001\u7b2c\u4e00\u884c\u4e0d\u662f\u5217\u5934\u65f6&#xff0c;\u5b83\u66ff\u4f60\u505a\u4e3b<\/li>\n<li>\u4e09\u3001\u7c7b\u578b\u63a8\u65ad&#xff1a;\u4e09\u4e2a\u53d8\u5f62\u4e00\u4e2a\u60ca\u559c<\/li>\n<li>\u56db\u300125KB \u7684\u6587\u4ef6&#xff0c;\u5b83\u8981 0.64 \u79d2<\/li>\n<li>\u4e94\u3001\u4e24\u5f20\u5634\u8138\u5bf9\u7167\u8868<\/li>\n<li>\u56db\u4e2a\u8981\u70b9\u6536\u5c3e<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>\u4e00\u3001\u5b83\u9ed8\u8ba4\u541e\u6389\u8fd9 19 \u79cd\u5b57\u7b26\u4e32<\/h3>\n<p>\u5148\u8bf4\u6700\u5e7f\u4e3a\u6d41\u4f20\u7684\u90a3\u4e2a\u4f20\u8bf4&#xff1a;\u300cpandas \u9ed8\u8ba4\u628a 69 \u79cd\u5b57\u7b26\u4e32\u5f53 NaN\u300d\u3002\u5b9e\u6d4b pandas 3.0.5&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> pandas <span class=\"token keyword\">as<\/span> pd<br \/>\n<span class=\"token keyword\">from<\/span> pandas<span class=\"token punctuation\">.<\/span>_libs<span class=\"token punctuation\">.<\/span>parsers <span class=\"token keyword\">import<\/span> STR_NA_VALUES<\/p>\n<p><span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>pd<span class=\"token punctuation\">.<\/span>__version__<span class=\"token punctuation\">,<\/span> <span class=\"token builtin\">len<\/span><span class=\"token punctuation\">(<\/span>STR_NA_VALUES<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">sorted<\/span><span class=\"token punctuation\">(<\/span>STR_NA_VALUES<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;&#039;-&#039; \u4f1a\u88ab\u541e\u5417:&#034;<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string\">&#034;-&#034;<\/span> <span class=\"token keyword\">in<\/span> STR_NA_VALUES<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># 3.0.5 19<\/span><br \/>\n<span class=\"token comment\"># [&#039;&#039;, &#039;#N\/A&#039;, &#039;#N\/A N\/A&#039;, &#039;#NA&#039;, &#039;-1.#IND&#039;, &#039;-1.#QNAN&#039;, &#039;-NaN&#039;, &#039;-nan&#039;,<\/span><br \/>\n<span class=\"token comment\">#  &#039;1.#IND&#039;, &#039;1.#QNAN&#039;, &#039;&lt;NA&gt;&#039;, &#039;N\/A&#039;, &#039;NA&#039;, &#039;NULL&#039;, &#039;NaN&#039;, &#039;None&#039;,<\/span><br \/>\n<span class=\"token comment\">#  &#039;n\/a&#039;, &#039;nan&#039;, &#039;null&#039;]<\/span><br \/>\n<span class=\"token comment\"># &#039;-&#039; \u4f1a\u88ab\u541e\u5417: False<\/span><\/p>\n<p>19 \u4e2a&#xff0c;\u4e0d\u662f 69\u2014\u2014\u90a3\u4e2a\u6570\u5b57\u662f\u8001\u9ec4\u5386\u4e86\u3002\u4f46\u8fd9 19 \u4e2a\u91cc\u85cf\u7740\u771f\u9ebb\u70e6&#xff0c;\u7528\u4e00\u4e2a\u5c0f\u8868\u770b\u5b83\u4eec\u600e\u4e48\u5de5\u4f5c&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> io<\/p>\n<p>mini <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;id,name,value\\\\n&#034;<\/span><br \/>\n        <span class=\"token string\">&#034;1,NA,5\\\\n2,None,7\\\\n3,NULL,9\\\\n&#034;<\/span><br \/>\n        <span class=\"token string\">&#034;4,-,11\\\\n5,\u2014,13\\\\n6,nan,15\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\nd_def <span class=\"token operator\">&#061;<\/span> pd<span class=\"token punctuation\">.<\/span>read_csv<span class=\"token punctuation\">(<\/span>io<span class=\"token punctuation\">.<\/span>StringIO<span class=\"token punctuation\">(<\/span>mini<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\nd_keep <span class=\"token operator\">&#061;<\/span> pd<span class=\"token punctuation\">.<\/span>read_csv<span class=\"token punctuation\">(<\/span>io<span class=\"token punctuation\">.<\/span>StringIO<span class=\"token punctuation\">(<\/span>mini<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> keep_default_na<span class=\"token operator\">&#061;<\/span><span class=\"token boolean\">False<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span>d_def<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;name&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span>d_keep<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;name&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># [nan, nan, nan, &#039;-&#039;, &#039;\u2014&#039;, nan]<\/span><br \/>\n<span class=\"token comment\"># [&#039;NA&#039;, &#039;None&#039;, &#039;NULL&#039;, &#039;-&#039;, &#039;\u2014&#039;, &#039;nan&#039;]<\/span><\/p>\n<p>\u516d\u4e2a\u540d\u5b57&#xff0c;\u9ed8\u8ba4\u8bfb\u53d6\u541e\u6389 5 \u4e2a&#xff1a;NA\u3001None\u3001NULL\u3001nan \u5168\u53d8 NaN&#xff0c;\u53ea\u5269 na \u7684\u53d8\u4f53\u91cc\u6ca1\u88ab\u8ba4\u51fa\u6765\u7684\u6a2a\u6760\u548c\u7834\u6298\u53f7\u3002\u5982\u679c NA \u662f\u7eb3\u7c73\u6bd4\u4e9a\u7684\u56fd\u5bb6\u4ee3\u7801\u3001None \u662f someone \u771f\u5b9e\u586b\u7684\u5360\u4f4d\u503c&#xff0c;\u4f60\u7684\u6570\u636e\u5c31\u5728\u65e0\u62a5\u9519\u7684\u60c5\u51b5\u4e0b\u7f3a\u4e86\u4e00\u5757\u3002keep_default_na&#061;False \u4e00\u4e2a\u53c2\u6570\u5168\u90e8\u4fdd\u4f4f\u3002<\/p>\n<p>\u6709\u4e00\u4e2a\u597d\u6d88\u606f\u503c\u5f97\u5355\u72ec\u8bf4&#xff1a;\u6a2a\u6760 &#8211; \u4e0d\u5728\u9ed8\u8ba4\u6e05\u5355\u91cc\u3002\u6211\u4e4b\u524d\u5ba1\u8ba1\u9999\u6e2f\u5e9f\u7269\u7edf\u8ba1\u65f6\u9047\u5230\u5927\u91cf\u7528 &#8211; \u8868\u793a\u300c\u65e0\u6570\u636e\u300d\u7684\u5b98\u65b9\u8868\u683c&#xff0c;\u5f53\u65f6\u62c5\u5fc3 pandas \u4f1a\u628a\u5b83\u4eec\u541e\u6210 NaN\u2014\u2014\u5b9e\u6d4b\u4e0d\u4f1a&#xff0c;\u5b83\u628a &#8211; \u5f53\u666e\u901a\u5b57\u7b26\u4e32\u3002\u771f\u6b63\u7684\u98ce\u9669\u6765\u81ea NA \u548c NULL \u8fd9\u79cd\u300c\u770b\u8d77\u6765\u50cf\u5360\u4f4d\u7b26\u300d\u7684\u5408\u6cd5\u503c\u3002<\/p>\n<p>\u7a7a\u5b57\u7b26\u4e32\u4e5f\u5728\u90a3 19 \u4e2a\u8bcd\u91cc&#xff0c;\u8fd9\u5f15\u51fa\u4e00\u4e2a\u53cd\u76f4\u89c9\u7684\u89c2\u5bdf&#xff1a;\u6211\u5728\u697c\u4ef7\u6307\u6570\u8868\u4e0a\u5b9e\u6d4b&#xff0c;404 \u884c\u6570\u636e\u91cc Class A \u5217\u4e00\u4e2a NaN \u90fd\u6ca1\u6709\u2014\u2014\u4f46\u8fd9\u5f20\u8868\u6709 8 \u4e2a Remarks \u5907\u6ce8\u5217&#xff0c;\u8bfb\u8fdb\u6765\u540e\u6ee1\u5c4f &lt;NaN&gt;&#xff08;RVD \u7528\u7a7a\u5b57\u7b26\u4e32\u8868\u793a\u300c\u65e0\u5907\u6ce8\u300d&#xff0c;pandas \u987a\u624b\u5168\u8f6c\u6210\u4e86 NaN&#xff09;\u3002\u7ed3\u679c\u53cd\u800c\u597d\u7528&#xff1a;df[&#034;Class A &#8211; Remarks&#034;].dropna() \u4e00\u884c\u5c31\u635e\u51fa\u5168\u90e8 P\/Z \u6807\u8bb0\u884c&#xff0c;\u7b49\u4e8e pandas \u66ff\u4f60\u628a\u300c\u7a7a\u300d\u548c\u300c\u6709\u5185\u5bb9\u300d\u5206\u597d\u4e86\u5806\u3002\u540c\u4e00\u79cd\u9ed8\u8ba4\u884c\u4e3a&#xff0c;\u5728\u503c\u5217\u662f\u5751\u3001\u5728\u5907\u6ce8\u5217\u662f\u7cd6\u2014\u2014\u9ed8\u8ba4\u503c\u6ca1\u6709\u5bf9\u9519&#xff0c;\u53ea\u6709\u548c\u4f60\u6570\u636e\u7684\u5339\u914d\u5ea6\u3002<\/p>\n<h3>\u4e8c\u3001\u7b2c\u4e00\u884c\u4e0d\u662f\u5217\u5934\u65f6&#xff0c;\u5b83\u66ff\u4f60\u505a\u4e3b<\/h3>\n<p>\u9999\u6e2f\u5dee\u9977\u7269\u4e1a\u4f30\u4ef7\u7f72\u7684 CSV \u957f\u8fd9\u6837&#xff1a;\u7b2c\u4e00\u884c\u662f\u5927\u5199\u6807\u9898&#xff08;PRIVATE DOMESTIC &#8211; PRICE INDICES&#8230;&#xff09;&#xff0c;\u7b2c\u4e8c\u884c\u624d\u662f\u5217\u5934\u3002\u9ed8\u8ba4\u8bfb\u53d6\u7684\u7ed3\u679c&#xff1a;<\/p>\n<p>df <span class=\"token operator\">&#061;<\/span> pd<span class=\"token punctuation\">.<\/span>read_csv<span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u539f\u59cb\u8fd4\u56de\/rvd\/1.4M_r0.csv&#034;<\/span><span class=\"token punctuation\">,<\/span> encoding<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;utf-8&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span><span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span>df<span class=\"token punctuation\">.<\/span>columns<span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">:<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># [&#039;PRIVATE  DOMESTIC  &#8211;  PRICE  INDICES  BY  CLASS  ( TERRITORY-WIDE ) [MONTHLY]&#039;,<\/span><br \/>\n<span class=\"token comment\">#  &#039;Unnamed: 1&#039;, &#039;Unnamed: 2&#039;]<\/span><\/p>\n<p>\u6574\u884c\u6807\u9898\u6210\u4e86\u7b2c\u4e00\u5217\u7684\u5217\u540d&#xff0c;\u5176\u4f59 16 \u5217\u5168\u90e8 Unnamed\u3002\u4e0d\u62a5\u9519\u3001\u6709\u6570\u636e&#xff0c;\u53ea\u662f\u540e\u9762\u6bcf\u4e00\u5904 df[&#034;Class A&#034;] \u90fd\u4f1a\u5f53\u573a KeyError\u2014\u2014\u9519\u8bef\u79bb\u73b0\u573a\u9694\u4e86\u4e00\u6574\u4e2a\u8bfb\u53d6\u6b65\u9aa4\u3002skiprows&#061;1 \u624d\u662f\u6b63\u786e\u6253\u5f00\u65b9\u5f0f\u3002\u8fd9\u4e0d\u7b97 pandas \u7684\u9519&#xff0c;\u4f46\u5b83\u300c\u9ed8\u8ba4\u628a\u7b2c\u4e00\u884c\u5f53\u5217\u5934\u300d\u7684\u51b3\u5b9a&#xff0c;\u9047\u5230\u653f\u5e9c\u7edf\u8ba1\u8fd9\u79cd\u5e26\u6807\u9898\u884c\u7684\u6587\u4ef6\u5c31\u7ffb\u4e86\u8f66\u3002<\/p>\n<h3>\u4e09\u3001\u7c7b\u578b\u63a8\u65ad&#xff1a;\u4e09\u4e2a\u53d8\u5f62\u4e00\u4e2a\u60ca\u559c<\/h3>\n<p>\u540c\u4e00\u4e2a\u4e09\u884c\u5c0f\u8868&#xff0c;read_csv \u7684\u7c7b\u578b\u63a8\u65ad\u4f1a\u505a\u4e09\u4ef6\u4e8b&#xff1a;<\/p>\n<p>probe <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;code,amount,unit\\\\n&#034;<\/span><br \/>\n         <span class=\"token string\">&#034;04,\\\\&#034;1,031,487\\\\&#034;,04A\\\\n&#034;<\/span><br \/>\n         <span class=\"token string\">&#034;07,\\\\&#034;231,487\\\\&#034;,12B\\\\n&#034;<\/span><br \/>\n         <span class=\"token string\">&#034;08,\\\\&#034;964,136\\\\&#034;,13C\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><br \/>\nd <span class=\"token operator\">&#061;<\/span> pd<span class=\"token punctuation\">.<\/span>read_csv<span class=\"token punctuation\">(<\/span>io<span class=\"token punctuation\">.<\/span>StringIO<span class=\"token punctuation\">(<\/span>probe<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>d<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;code&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>tolist<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span> d<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;code&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>dtype<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>d<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;amount&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>dtype<span class=\"token punctuation\">,<\/span> <span class=\"token builtin\">repr<\/span><span class=\"token punctuation\">(<\/span>d<span class=\"token punctuation\">[<\/span><span class=\"token string\">&#034;amount&#034;<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>iloc<span class=\"token punctuation\">[<\/span><span class=\"token number\">0<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># [4, 7, 8] int64<\/span><br \/>\n<span class=\"token comment\"># str &#039;1,031,487&#039;<\/span><\/p>\n<li>\u524d\u5bfc\u96f6\u6ca1\u4e86&#xff1a;\u90e8\u95e8\u4ee3\u7801 04 \u53d8\u6210\u6574\u6570 4\u3002\u4ee3\u7801\u3001\u7f16\u53f7\u3001\u884c\u653f\u533a\u5212\u8fd9\u7c7b\u5b57\u6bb5\u8981 dtype&#061;str \u663e\u5f0f\u58f0\u660e&#xff0c;\u5426\u5219\u300c04 \u53f7\u90e8\u95e8\u300d\u5728\u4f60\u7684\u6570\u636e\u91cc\u4ece\u6b64\u4e0d\u5b58\u5728&#xff1b;<\/li>\n<li>\u5343\u5206\u4f4d\u6570\u5b57\u662f\u5b57\u7b26\u4e32&#xff1a;1,031,487 \u4e0d\u62a5\u9519&#xff0c;\u5b89\u9759\u5730\u53d8\u6210 str&#xff08;pandas 3.0 \u91cc\u5b57\u7b26\u4e32\u5217\u7684 dtype \u663e\u793a\u4e3a str \u800c\u4e0d\u662f\u4ee5\u524d\u7684 object&#xff09;\u3002\u540e\u9762\u505a\u6570\u503c\u8fd0\u7b97\u65f6\u624d\u70b8&#xff1b;<\/li>\n<li>\u60ca\u559c\u5728\u8fd9\u91cc\u2014\u2014\u5e74\u5ea6\u6307\u6570\u8868\u7684\u884c\u6807\u7b7e\u539f\u672c\u662f &#039;1980 &#039;&#xff08;\u5e26\u5c3e\u90e8\u7a7a\u683c&#xff0c;\u6211\u4e0a\u4e2a\u6708\u7528\u6807\u51c6\u5e93\u9010\u5b57\u7b26\u6838\u5bf9\u8fc7&#xff09;&#xff0c;pandas \u8bfb\u8fdb\u6765\u6084\u6084\u5e2e\u4f60 strip \u6210\u4e86 &#039;1980&#039;\u3002\u540c\u4e00\u4efd\u6587\u4ef6\u3001\u4e24\u4e2a\u5de5\u5177\u3001\u4e24\u79cd\u7ed3\u679c&#xff1a;\u4f60\u7684 csv.reader \u4ea7\u7269\u548c\u540c\u4e8b\u7684 pandas \u4ea7\u7269\u505a join&#xff0c;\u4e00\u8fb9 &#039;1980 &#039; \u4e00\u8fb9 &#039;1980&#039;&#xff0c;\u5339\u914d\u7387\u4e3a\u96f6\u3002<\/li>\n<p>BOM \u4e5f\u987a\u5e26\u6d4b\u4e86&#xff1a;\u672c\u7cfb\u5217\u5728\u6d88\u59d4\u4f1a\u4ef7\u683c\u76d1\u5bdf CSV \u4e0a\u771f\u5b9e\u9047\u5230\u8fc7 BOM&#xff08;1.07MB \u7684\u6587\u4ef6&#xff0c;\u5b57\u8282\u5934\u5c31\u662f EF BB BF&#xff09;\u3002pandas 3.0.5 \u5373\u4f7f\u7528 encoding&#061;&#034;utf-8&#034; \u4e5f\u80fd\u81ea\u52a8\u5265\u6389&#xff1b;\u4f46\u6807\u51c6\u5e93 csv.reader \u4e0d\u5265&#xff0c;\u9996\u5217\u540d\u4f1a\u5e26\u7740\u770b\u4e0d\u89c1\u7684 \\\\ufeff \u524d\u7f00\u3002\u5de5\u5177\u5347\u7ea7\u628a\u4e00\u4e2a\u8001\u5751\u586b\u4e86&#xff0c;\u53ef\u4f60\u53c2\u8003\u7684\u8001\u6559\u7a0b\u8fd8\u5728\u6559 utf-8-sig\u2014\u2014\u586b\u5751\u8fd9\u4ef6\u4e8b&#xff0c;\u6587\u6863\u6c38\u8fdc\u6bd4\u4ee3\u7801\u6162\u4e00\u62cd\u3002<\/p>\n<h3>\u56db\u300125KB \u7684\u6587\u4ef6&#xff0c;\u5b83\u8981 0.64 \u79d2<\/h3>\n<p>\u6700\u540e\u4e00\u7b14\u8d26\u662f\u65f6\u95f4&#xff1a;<\/p>\n<p><span class=\"token keyword\">import<\/span> csv<span class=\"token punctuation\">,<\/span> statistics<span class=\"token punctuation\">,<\/span> time<\/p>\n<p><span class=\"token keyword\">def<\/span> <span class=\"token function\">bench<\/span><span class=\"token punctuation\">(<\/span>fn<span class=\"token punctuation\">,<\/span> n<span class=\"token operator\">&#061;<\/span><span class=\"token number\">7<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n    ts <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><br \/>\n    <span class=\"token keyword\">for<\/span> _ <span class=\"token keyword\">in<\/span> <span class=\"token builtin\">range<\/span><span class=\"token punctuation\">(<\/span>n<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">:<\/span><br \/>\n        t0 <span class=\"token operator\">&#061;<\/span> time<span class=\"token punctuation\">.<\/span>perf_counter<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        fn<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        ts<span class=\"token punctuation\">.<\/span>append<span class=\"token punctuation\">(<\/span>time<span class=\"token punctuation\">.<\/span>perf_counter<span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&#8211;<\/span> t0<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token builtin\">round<\/span><span class=\"token punctuation\">(<\/span>statistics<span class=\"token punctuation\">.<\/span>median<span class=\"token punctuation\">(<\/span>ts<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">*<\/span> <span class=\"token number\">1000<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><\/p>\n<p>t_pandas <span class=\"token operator\">&#061;<\/span> bench<span class=\"token punctuation\">(<\/span><span class=\"token keyword\">lambda<\/span><span class=\"token punctuation\">:<\/span> pd<span class=\"token punctuation\">.<\/span>read_csv<span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token string\">&#034;\u539f\u59cb\u8fd4\u56de\/rvd\/1.4M_r0.csv&#034;<\/span><span class=\"token punctuation\">,<\/span> encoding<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;utf-8-sig&#034;<\/span><span class=\"token punctuation\">,<\/span> skiprows<span class=\"token operator\">&#061;<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\nt_csv <span class=\"token operator\">&#061;<\/span> bench<span class=\"token punctuation\">(<\/span><span class=\"token keyword\">lambda<\/span><span class=\"token punctuation\">:<\/span> <span class=\"token builtin\">list<\/span><span class=\"token punctuation\">(<\/span>csv<span class=\"token punctuation\">.<\/span>reader<span class=\"token punctuation\">(<\/span><br \/>\n    <span class=\"token builtin\">open<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u539f\u59cb\u8fd4\u56de\/rvd\/1.4M_r0.csv&#034;<\/span><span class=\"token punctuation\">,<\/span> encoding<span class=\"token operator\">&#061;<\/span><span class=\"token string\">&#034;utf-8-sig&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token keyword\">print<\/span><span class=\"token punctuation\">(<\/span>t_pandas<span class=\"token punctuation\">,<\/span> t_csv<span class=\"token punctuation\">)<\/span><\/p>\n<p><span class=\"token comment\"># 3.1 0.7<\/span><\/p>\n<p>25KB \u7684\u6708\u5ea6\u6307\u6570\u8868&#xff1a;pandas \u5149\u5bfc\u5165\u5c31\u8981 640 \u6beb\u79d2&#xff08;\u5e72\u51c0\u89e3\u91ca\u5668\u91cc\u5355\u72ec\u91cf import pandas&#xff0c;7 \u6b21\u53d6\u4e2d\u4f4d 640.4 \u6beb\u79d2\u2014\u2014__import__ \u662f\u5e42\u7b49\u7684&#xff0c;\u5728\u5df2\u5bfc\u5165\u7684\u89e3\u91ca\u5668\u91cc\u8ba1\u65f6\u53ea\u4f1a\u5f97\u5230 0&#xff09;&#xff0c;\u8bfb\u53d6\u518d\u82b1 3.1 \u6beb\u79d2&#xff1b;\u6807\u51c6\u5e93 csv.reader \u5168\u7a0b 0.7 \u6beb\u79d2\u2014\u2014\u603b\u8017\u65f6\u5dee\u7740\u7ea6 900 \u500d\u3002\u6279\u91cf\u6293 30 \u4e2a\u5b98\u65b9\u6e90\u7684\u81ea\u52a8\u5316\u811a\u672c\u91cc&#xff0c;\u8fd9\u4e2a\u5dee\u8ddd\u4e58\u4e0a\u4efb\u52a1\u6570\u5c31\u662f\u5206\u949f\u7ea7\u3002pandas \u7684\u4ef7\u503c\u5728\u5411\u91cf\u5316\u8fd0\u7b97&#xff0c;\u4e0d\u5728\u300c\u628a\u6587\u4ef6\u8bfb\u8fdb\u6765\u300d&#xff1b;\u5c0f\u6587\u4ef6\u3001\u5355\u904d\u626b\u63cf\u7684\u573a\u666f&#xff0c;\u6807\u51c6\u5e93\u66f4\u5408\u9002\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260928134857-6aba7049116f5.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260928134857-6aba70496c6f1.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260928134857-6aba7049c894e.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>\u4e94\u3001\u4e24\u5f20\u5634\u8138\u5bf9\u7167\u8868<\/h3>\n<p>\u628a\u4e0a\u9762\u6240\u6709\u5b9e\u6d4b\u6446\u5230\u4e00\u8d77&#xff0c;\u300c\u540c\u4e00\u4e2a\u6587\u4ef6\u3001\u4e24\u4e2a\u5de5\u5177\u300d\u7684\u5dee\u5f02\u4e00\u76ee\u4e86\u7136&#xff1a;<\/p>\n<table>\n<tr>\u89c2\u5bdfcsv.reader&#xff08;\u6807\u51c6\u5e93&#xff09;pd.read_csv&#xff08;\u9ed8\u8ba4\u53c2\u6570&#xff09;<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">\u6807\u9898\u884c<\/td>\n<td align=\"left\">\u4f60\u81ea\u5df1\u51b3\u5b9a\u8df3\u4e0d\u8df3<\/td>\n<td align=\"left\">\u9ed8\u8ba4\u5f53\u5217\u5934&#xff0c;\u5176\u4f59\u5217 Unnamed<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">&#039;NA&#039;\/&#039;NULL&#039;\/&#039;None&#039;<\/td>\n<td align=\"left\">\u539f\u6837\u5b57\u7b26\u4e32<\/td>\n<td align=\"left\">\u9759\u9ed8\u53d8 NaN<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">&#039;1980 &#039; \u5c3e\u7a7a\u683c<\/td>\n<td align=\"left\">\u539f\u6837\u4fdd\u7559<\/td>\n<td align=\"left\">\u81ea\u52a8 strip \u6210 &#039;1980&#039;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">&#039;04&#039; \u524d\u5bfc\u96f6<\/td>\n<td align=\"left\">\u5b57\u7b26\u4e32 &#039;04&#039;<\/td>\n<td align=\"left\">\u53d8\u6574\u6570 4<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">&#039;1,031,487&#039;<\/td>\n<td align=\"left\">\u5b57\u7b26\u4e32<\/td>\n<td align=\"left\">\u5b57\u7b26\u4e32&#xff08;dtype \u663e\u793a str&#xff09;<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">BOM &#xfeff;<\/td>\n<td align=\"left\">\u7559\u5728\u9996\u5217\u540d<\/td>\n<td align=\"left\">3.0 \u8d77\u81ea\u52a8\u5265\u6389<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">25KB \u8bfb\u53d6\u8017\u65f6<\/td>\n<td align=\"left\">0.7 ms<\/td>\n<td align=\"left\">3.1 ms&#xff08;\u53e6\u52a0\u5bfc\u5165 640 ms&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8fd9\u5f20\u8868\u5de6\u8fb9\u4e00\u5217\u5168\u662f\u300c\u4f60\u8bf4\u4e86\u7b97\u300d&#xff0c;\u53f3\u8fb9\u4e00\u5217\u5168\u662f\u300c\u5b83\u66ff\u4f60\u51b3\u5b9a\u300d\u2014\u2014\u4e24\u79cd\u90fd\u5408\u6cd5&#xff0c;\u4f46\u6df7\u7528\u4e24\u8fb9\u7684\u7ed3\u679c\u505a join\u3001\u505a\u5bf9\u8d26\u65f6&#xff0c;\u5148\u60f3\u6e05\u695a\u6bcf\u4e00\u683c\u662f\u8c01\u505a\u7684\u4e3b\u3002\u81f3\u4e8e\u4ec0\u4e48\u65f6\u5019\u7528\u54ea\u4e2a&#xff1a;\u4e00\u6b21\u6027\u5206\u6790\u3001\u8981\u8ddf DataFrame \u751f\u6001\u8854\u63a5&#xff0c;pandas \u503c\u5f97\u90a3 640 \u6beb\u79d2&#xff1b;\u5e38\u9a7b\u7684\u81ea\u52a8\u5316\u811a\u672c\u3001\u9010\u884c\u6d41\u5f0f\u5904\u7406\u3001\u6216\u8005\u50cf\u6211\u8fd9\u6837\u6bcf\u5929\u8981\u8ddf\u51e0\u5341\u4e2a\u957f\u76f8\u5404\u5f02\u7684\u5b98\u65b9\u6587\u4ef6\u6253\u4ea4\u9053&#xff0c;\u6807\u51c6\u5e93\u90a3 0.7 \u6beb\u79d2\u548c\u300c\u4e00\u5207\u663e\u5f0f\u300d\u7684\u8e0f\u5b9e\u611f\u66f4\u503c\u94b1\u3002<\/p>\n<h3>\u56db\u4e2a\u8981\u70b9\u6536\u5c3e<\/h3>\n<li>\u663e\u5f0f\u58f0\u660e\u80dc\u8fc7\u9ed8\u8ba4\u63a8\u65ad&#xff1a;\u4ee3\u7801\u5217 dtype&#061;str\u3001\u7981\u6b62\u81ea\u52a8\u541e keep_default_na&#061;False\u3001\u5e26\u6807\u9898\u884c skiprows&#xff0c;\u4e09\u4e2a\u53c2\u6570\u5199\u5168&#xff0c;read_csv \u624d\u662f\u53ef\u9884\u671f\u7684&#xff1b;<\/li>\n<li>19 \u4e2a\u9ed8\u8ba4 NaN \u8bcd&#xff08;\u4e0d\u662f 69&#xff09;&#xff1a;NA\/NULL\/None \u662f\u5408\u6cd5\u503c\u7684\u5217\u5fc5\u987b\u5173\u6389\u9ed8\u8ba4\u541e&#xff1b;<\/li>\n<li>pandas \u4f1a\u6084\u6084\u66ff\u4f60\u6536\u62fe\u6570\u636e&#xff1a;\u5265 BOM\u3001\u53bb\u5c3e\u7a7a\u683c&#xff0c;\u65b9\u4fbf\u4f46\u5236\u9020\u4e86\u300c\u4e0e\u6807\u51c6\u5e93\u8bfb\u53d6\u7ed3\u679c\u4e0d\u4e00\u81f4\u300d\u7684\u6697\u5751&#xff0c;\u8de8\u5de5\u5177\u5bf9\u6570\u636e\u524d\u5148\u5bf9\u9f50\u8fd9\u4e00\u5c42&#xff1b;<\/li>\n<li>\u8bfb\u6587\u4ef6\u4e0d\u662f pandas \u7684\u4e3b\u573a&#xff1a;25KB \u6587\u4ef6 900 \u500d\u7684\u8017\u65f6\u5dee&#xff0c;\u6279\u5904\u7406\u811a\u672c\u91cc\u6807\u51c6\u5e93 csv \u53cd\u800c\u662f\u6b63\u89e3\u3002<\/li>\n<p>\u5410\u69fd\u5b8c\u4e86&#xff0c;\u8be5\u8bf4\u53e5\u516c\u9053\u8bdd&#xff1a;\u8fd9 63 \u4e2a\u811a\u672c\u91cc\u51e1\u662f\u771f\u8981\u505a\u6570\u503c\u5206\u6790\u548c\u753b\u56fe\u7684&#xff0c;pandas \u4f9d\u7136\u662f\u4e3b\u529b\u2014\u2014\u88ab\u9a82\u7684\u4ece\u6765\u4e0d\u662f\u5b83\u7684\u80fd\u529b&#xff0c;\u662f\u90a3\u4e9b\u6ca1\u5546\u91cf\u5c31\u66ff\u4f60\u505a\u7684\u51b3\u5b9a\u3002\u672c\u6587\u6240\u6709\u6570\u5b57\u53ef\u590d\u73b0&#xff0c;\u811a\u672c\u548c\u539f\u59cb\u8fd4\u56de&#xff08;RVD \u4e24\u4efd\u6587\u4ef6\u53cc\u8f6e\u5feb\u7167&#xff09;\u90fd\u5728\u4ed3\u5e93&#xff0c;\u53d6\u6570\u65f6\u95f4 2026-09-28&#xff0c;pandas 3.0.5\u3002<\/p>\n<hr \/>\n<p>\u53c2\u8003\u94fe\u63a5<\/p>\n<li>https:\/\/pandas.pydata.org\/docs\/reference\/api\/pandas.read_csv.html<\/li>\n<li>https:\/\/www.rvd.gov.hk\/datagovhk\/1.4M.csv<\/li>\n<li>https:\/\/data.gov.hk\/en-data\/api\/3\/action\/package_show?id&#061;hk-rvd-tsinfo_rvd-property-market-statistics<\/li>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/09\/20260928134858-6aba704a2328f.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" 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