{"id":633,"date":"2022-12-31T21:00:02","date_gmt":"2023-04-11T23:24:19","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/dataframe%e3%82%92csv%e3%81%ab%e5%a4%89%e6%8f%9b%e3%81%99%e3%82%8b%e3%81%9f%e3%82%81%e3%81%aepandas%e3%81%aeto_csv\/"},"modified":"2025-08-01T01:14:59","modified_gmt":"2025-07-31T16:14:59","slug":"dataframe%e3%82%92csv%e3%81%ab%e5%a4%89%e6%8f%9b%e3%81%99%e3%82%8b%e3%81%9f%e3%82%81%e3%81%aepandas%e3%81%aeto_csv","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/dataframe%e3%82%92csv%e3%81%ab%e5%a4%89%e6%8f%9b%e3%81%99%e3%82%8b%e3%81%9f%e3%82%81%e3%81%aepandas%e3%81%aeto_csv\/","title":{"rendered":"DataFrame\u3092CSV\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306ePandas\u306eto_csv()"},"content":{"rendered":"<p>Pandas\u306eDataFrame\u306eto_csv()\u95a2\u6570\u306f\u3001DataFrame\u3092CSV\u30c7\u30fc\u30bf\u306b\u5909\u63db\u3057\u307e\u3059\u3002CSV\u30c7\u30fc\u30bf\u3092\u30d5\u30a1\u30a4\u30eb\u306b\u66f8\u304d\u8fbc\u3080\u5834\u5408\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6e21\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306f\u3001CSV\u30c7\u30fc\u30bf\u304c\u6587\u5b57\u5217\u5f62\u5f0f\u3067\u8fd4\u3055\u308c\u307e\u3059\u3002<\/p>\n<h2>\u30d1\u30f3\u30c0\u306e\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0to_csv()\u306e\u6587\u6cd5<\/h2>\n<p>DataFrame\u306eto_csv()\u95a2\u6570\u306e\u6587\u6cd5\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>def to_csv(\r\n    self,\r\n    path_or_buf=None,\r\n    sep=\",\",\r\n    na_rep=\"\",\r\n    float_format=None,\r\n    columns=None,\r\n    header=True,\r\n    index=True,\r\n    index_label=None,\r\n    mode=\"w\",\r\n    encoding=None,\r\n    compression=\"infer\",\r\n    quoting=None,\r\n    quotechar='\"',\r\n    line_terminator=None,\r\n    chunksize=None,\r\n    date_format=None,\r\n    doublequote=True,\r\n    escapechar=None,\r\n    decimal=\".\",\r\n)\r\n<\/code><\/pre>\n<p>\u91cd\u8981\u306a\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u3044\u304f\u3064\u304b\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li>path_or_buf: the file object to write the CSV data. If this argument is not provided, the CSV data is returned as a string.<\/li>\n<li>sep: the delimiter for the CSV data. It should be a string of length 1, the default is a comma.<\/li>\n<li>na_rep: string representing null or missing values, default is empty string.<\/li>\n<li>columns: a sequence to specify the columns to include in the CSV output.<\/li>\n<li>header: the allowed values are boolean or a list of string, default is True. If False, the column names are not written in the output. If a list of string, it\u2019s used to write the column names. The length of the list of string should be the same as the number of columns being written in the CSV file.<\/li>\n<li>index: if True, index is included in the CSV data. If False, the index value is not written in the CSV output.<\/li>\n<li>index_label: used to specify the column name for index.<\/li>\n<\/ul>\n<h2>\u30d1\u30f3\u30c0\u306e\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u3092CSV\u306b\u5909\u63db\u3059\u308b\u4f8b<\/h2>\n<p>DataFrame\u3092CSV\u30c7\u30fc\u30bf\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u306bto_csv()\u95a2\u6570\u3092\u4f7f\u7528\u3059\u308b\u4e00\u822c\u7684\u306a\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>1. \u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u3092CSV\u5f62\u5f0f\u306e\u6587\u5b57\u5217\u306b\u5909\u63db\u3059\u308b<\/h3>\n<pre class=\"post-pre\"><code>import pandas as pd\r\n\r\nd1 = {'Name': ['Pankaj', 'Meghna'], 'ID': [1, 2], 'Role': ['CEO', 'CTO']}\r\n\r\ndf = pd.DataFrame(d1)\r\n\r\nprint('DataFrame:\\n', df)\r\n\r\n# default CSV\r\ncsv_data = df.to_csv()\r\nprint('\\nCSV String:\\n', csv_data)\r\n<\/code><\/pre>\n<p>\u51fa\u529b:<\/p>\n<pre class=\"post-pre\"><code>DataFrame:\r\n      Name  ID Role\r\n0  Pankaj   1  CEO\r\n1  Meghna   2  CTO\r\n\r\nCSV String:\r\n ,Name,ID,Role\r\n0,Pankaj,1,CEO\r\n1,Meghna,2,CTO\r\n<\/code><\/pre>\n<h3>2. CSV\u51fa\u529b\u306e\u533a\u5207\u308a\u6587\u5b57\u3092\u6307\u5b9a<\/h3>\n<pre class=\"post-pre\"><code>csv_data = df.to_csv(sep='|')\r\nprint(csv_data)\r\n<\/code><\/pre>\n<p>\u51fa\u529b\uff1a<\/p>\n<pre class=\"post-pre\"><code>|Name|ID|Role\r\n0|Pankaj|1|CEO\r\n1|Meghna|2|CTO\r\n<\/code><\/pre>\n<p>\u3082\u3057\u6307\u5b9a\u3055\u308c\u305f\u533a\u5207\u308a\u6587\u5b57\u306e\u9577\u3055\u304c1\u3067\u306f\u306a\u3044\u5834\u5408\u3001TypeError: &#8220;delimiter&#8221;\u306f1\u6587\u5b57\u306e\u6587\u5b57\u5217\u3067\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3068\u3044\u3046\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3059\u3002<\/p>\n<h3>\uff13\uff0eCSV\u51fa\u529b\u306e\u305f\u3081\u306b\u3001\u4e00\u90e8\u306e\u5217\u306e\u307f\u9078\u629e\u3057\u307e\u3059\u3002<\/h3>\n<pre class=\"post-pre\"><code>csv_data = df.to_csv(columns=['Name', 'ID'])\r\nprint(csv_data)\r\n<\/code><\/pre>\n<p>\u51fa\u529b\uff1a<\/p>\n<pre class=\"post-pre\"><code>,Name,ID\r\n0,Pankaj,1\r\n1,Meghna,2\r\n<\/code><\/pre>\n<p>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u6709\u52b9\u306a\u5217\u3068\u306f\u898b\u306a\u3055\u308c\u306a\u3044\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<h3>4. CSV\u51fa\u529b\u6642\u306b\u30d8\u30c3\u30c0\u30fc\u884c\u3092\u7121\u8996\u3059\u308b\u3002<\/h3>\n<pre class=\"post-pre\"><code>csv_data = df.to_csv(header=False)\r\nprint(csv_data)\r\n<\/code><\/pre>\n<p>\u51fa\u529b\uff1a<\/p>\n<pre class=\"post-pre\"><code>0,Pankaj,1,CEO\r\n1,Meghna,2,CTO\r\n<\/code><\/pre>\n<h3>5. CSV\u306b\u30ab\u30b9\u30bf\u30e0\u306e\u5217\u540d\u3092\u8a2d\u5b9a\u3059\u308b\u3002<\/h3>\n<pre class=\"post-pre\"><code>csv_data = df.to_csv(header=['NAME', 'ID', 'ROLE'])\r\nprint(csv_data)\r\n<\/code><\/pre>\n<p>\u51fa\u529b:<\/p>\n<pre class=\"post-pre\"><code>,NAME,ID,ROLE\r\n0,Pankaj,1,CEO\r\n1,Meghna,2,CTO\r\n<\/code><\/pre>\n<p>\u518d\u3073\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306fDataFrame\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5217\u3068\u3057\u3066\u8003\u3048\u3089\u308c\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n<h3>6. CSV\u51fa\u529b\u306b\u304a\u3044\u3066\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5217\u3092\u7701\u7565\u3059\u308b\u3002<\/h3>\n<pre class=\"post-pre\"><code>csv_data = df.to_csv(index=False)\r\nprint(csv_data)\r\n<\/code><\/pre>\n<p>\u51fa\u529b\uff1a<\/p>\n<pre class=\"post-pre\"><code>Name,ID,Role\r\nPankaj,1,CEO\r\nMeghna,2,CTO\r\n<\/code><\/pre>\n<h3>7. CSV \u3067\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5217\u306e\u540d\u524d\u3092\u8a2d\u5b9a\u3059\u308b\u3002<\/h3>\n<pre class=\"post-pre\"><code>csv_data = df.to_csv(index_label='Sl No.')\r\nprint(csv_data)\r\n<\/code><\/pre>\n<p>\u51fa\u529b:<\/p>\n<pre class=\"post-pre\"><code>Sl No.,Name,ID,Role\r\n0,Pankaj,1,CEO\r\n1,Meghna,2,CTO\r\n<\/code><\/pre>\n<h3>8. DataFrame\u3092CSV\u30d5\u30a1\u30a4\u30eb\u306b\u5909\u63db\u3059\u308b\u3002<\/h3>\n<pre class=\"post-pre\"><code>with open('csv_data.txt', 'w') as csv_file:\r\n    df.to_csv(path_or_buf=csv_file)\r\n<\/code><\/pre>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/6564944edaa94e2bdf7befc7\/41-0.png\" alt=\"Pandas DataFrame To Csv File\" \/><\/div>\n<h3>9. CSV\u51fa\u529b\u306b\u304a\u3051\u308bNull\u3001NA\u3001\u307e\u305f\u306f\u6b20\u640d\u30c7\u30fc\u30bf\u306e\u8868\u73fe<\/h3>\n<pre class=\"post-pre\"><code>import pandas as pd\r\n\r\nd1 = {'Name': ['Pankaj', 'Meghna'], 'ID': [1, pd.NaT], 'Role': [pd.NaT, 'CTO']}\r\ndf = pd.DataFrame(d1)\r\nprint('DataFrame:\\n', df)\r\n\r\ncsv_data = df.to_csv()\r\nprint('\\nCSV String:\\n', csv_data)\r\n\r\ncsv_data = df.to_csv(na_rep=\"None\")\r\nprint('CSV String with Null Data Representation:\\n', csv_data)\r\n<\/code><\/pre>\n<p>\u7d50\u679c\uff1a<\/p>\n<pre class=\"post-pre\"><code>DataFrame:\r\n      Name   ID Role\r\n0  Pankaj    1  NaT\r\n1  Meghna  NaT  CTO\r\n\r\nCSV String:\r\n ,Name,ID,Role\r\n0,Pankaj,1,\r\n1,Meghna,,CTO\r\n\r\nCSV String with Null Data Representation:\r\n ,Name,ID,Role\r\n0,Pankaj,1,None\r\n1,Meghna,None,CTO\r\n<\/code><\/pre>\n<h2>\u53c2\u8003\u6587\u732e<\/h2>\n<ul class=\"post-ul\">\n<li>Pandas read_csv() \u2013 Reading CSV File to DataFrame<\/li>\n<li>Python Pandas Module Tutorial<\/li>\n<li>DataFrame to_csv() API Doc<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Pandas\u306eDataFrame\u306eto_csv()\u95a2\u6570\u306f\u3001DataFrame\u3092CSV\u30c7\u30fc\u30bf\u306b\u5909\u63db\u3057\u307e\u3059\u3002CSV\u30c7\u30fc\u30bf\u3092\u30d5\u30a1\u30a4\u30eb\u306b\u66f8\u304d\u8fbc\u3080\u5834\u5408\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6e21\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u308c\u4ee5\u5916\u306e\u5834\u5408\u306f\u3001CSV\u30c7\u30fc\u30bf\u304c\u6587 [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-633","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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