{"id":1260,"date":"2019-12-01T11:20:43","date_gmt":"2019-12-01T02:20:43","guid":{"rendered":"https:\/\/itips.krsw.biz\/?p=1260"},"modified":"2019-12-01T11:20:43","modified_gmt":"2019-12-01T02:20:43","slug":"pandas-datetime-change-numeric-issue","status":"publish","type":"post","link":"https:\/\/itips.krsw.biz\/en\/pandas-datetime-change-numeric-issue\/","title":{"rendered":"Why datetime value is converted to numeric in pandas?"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/itips.krsw.biz\/wp-content\/uploads\/2019\/12\/pandas_datetime_numeric_en-800x512.jpg\" alt=\"Why datetime value is converted to numeric in pandas?\" height=\"450\" class=\"aligncenter size-large wp-image-1262\" srcset=\"https:\/\/itips.krsw.biz\/wp-content\/uploads\/2019\/12\/pandas_datetime_numeric_en-800x512.jpg 800w, https:\/\/itips.krsw.biz\/wp-content\/uploads\/2019\/12\/pandas_datetime_numeric_en-640x410.jpg 640w, https:\/\/itips.krsw.biz\/wp-content\/uploads\/2019\/12\/pandas_datetime_numeric_en-768x492.jpg 768w, https:\/\/itips.krsw.biz\/wp-content\/uploads\/2019\/12\/pandas_datetime_numeric_en.jpg 1000w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>Strange thing was happened.<br \/>\nI set datetime value in Pandas Dataframe.<br \/>\nBut it was changed to numeric value in next moment.<br \/>\nIt was not a magic, so I would like show you why the datetime value was converted to numeric.<\/p>\n<p><!--more--><\/p>\n<p><\/br><\/p>\n<h2>datetime value is converted to  numeric<\/h2>\n<p>I describe why datetime value is converted to numeric with using following codes.<\/p>\n<p><\/br><\/p>\n<h3>Initialize<\/h3>\n<p>First, I define Dataframe.<\/p>\n<pre class=\"prettyprint lang-python\">\nimport pandas as pd\nimport numpy as np\nimport datetime\n\ncols = &#91;&#34;c1&#34;, &#34;c2&#34;&#93;\nvals = np.array(&#91;&#91;1,2&#93;, &#91;4,5&#93;&#93;)\ndf = pd.DataFrame(vals, columns=cols)\nprint(df)\n\n#    c1  c2\n# 0   1   2\n# 1   4   5\n<\/pre>\n<p>Then add a new column for datetime value.<\/p>\n<pre class=\"prettyprint lang-python\">\n# Add new column\ndf&#91;&#34;hoge&#34;&#93; = None\nprint(df)\n#    c1  c2  hoge\n# 0   1   2  None\n# 1   4   5  None\n<\/pre>\n<h3>(Failure) Update by sliced Dataframe<\/h3>\n<p>Next, I sliced Dataframe and set datetime value (2019\/11\/28).<br \/>\nAfter that I updated original Dataframe by sliced Dataframe.<br \/>\nThen datetime value was converted numeric value <code>1574899200000000000<\/code> .<\/p>\n<pre class=\"prettyprint lang-python\">\n# Update by sliced data\ndf_slice = df&#91;df&#91;&#34;c1&#34;&#93; &gt; 3&#93;\ndf_slice&#91;&#34;hoge&#34;&#93; = datetime.datetime(2019,11,28)\ndf&#91;&#34;hoge&#34;&#93;.update(df_slice&#91;&#34;hoge&#34;&#93;)\nprint(df)\n\n#    c1  c2                 hoge\n# 0   1   2                 None\n# 1   4   5  1574899200000000000\n<\/pre>\n<p><\/br><\/p>\n<h3>(Solution) Convert column to datetime format<\/h3>\n<p>When I thought about cause of conversion, I thought that it may be caused by column format.<br \/>\nOriginal column format is not datetime. So it was converted in update.<br \/>\nIn order to confirm the hypothesis, I converted the added column to datetime. After that I updated and I could see date value. But it seemed just a date value, not a datetime value.<\/p>\n<pre class=\"prettyprint lang-python\">\n# Convert column before update\ndf&#91;&#34;hoge&#34;&#93; = pd.to_datetime(df&#91;&#34;hoge&#34;&#93;)\ndf_slice = df&#91;df&#91;&#34;c1&#34;&#93; &gt; 3&#93;\ndf_slice&#91;&#34;hoge&#34;&#93; = datetime.datetime(2019,11,28)\ndf&#91;&#34;hoge&#34;&#93;.update(df_slice&#91;&#34;hoge&#34;&#93;)\nprint(df)\n\n#    c1  c2       hoge\n# 0   1   2        NaT\n# 1   4   5 2019-11-28\n<\/pre>\n<p><\/br><\/p>\n<h3>(Solution2) Use index and loc instead of update<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/itips.krsw.biz\/wp-content\/uploads\/2018\/12\/f2d3db3c09518b0090e54c2f310bfe23-1024x512.png\" alt=\"Use index and loc instead of update\" \/><\/p>\n<p>Python says &quot;Do not set value directly. Use <code>loc<\/code>.&quot;<br \/>\nSo I use index and loc instead of <code>update<\/code>.<br \/>\nThen datetime value was set in original Dataframe.<\/p>\n<blockquote>\n<p>A value is trying to be set on a copy of a slice from a DataFrame.<br \/>\nTry using .loc[row_indexer,col_indexer] = value instead<\/p>\n<\/blockquote>\n<pre class=\"prettyprint lang-python\">\n# Use index and loc instead of update\ndf_slice_index = df&#91;df&#91;&#34;c1&#34;&#93; &gt; 3&#93;.index\ndf.loc&#91;df_slice_index,&#34;hoge&#34;&#93; = datetime.datetime(2019,11,28)\nprint(df)\n\n#    c1  c2                 hoge\n# 0   1   2                 None\n# 1   4   5  2019-11-28 00:00:00\n<\/pre>\n<p><\/br><\/p>\n<h2>Finally<\/h2>\n<p>Why datetime value is converted to numeric in pandas?<br \/>\nIt is because original column format is not datetime.<br \/>\nSo it is converted to numeric value when it is updated.<\/p>\n<p>Solutions are following.<\/p>\n<ul>\n<li>Convert column to datetime<\/li>\n<li>Use <code>loc<\/code> instead of <code>update<\/code><\/li>\n<\/ul>\n<p><\/br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Strange thing was happened. I set datetime value in Pandas Dataframe. But it was changed to numeric  &#8230; <\/p>\n","protected":false},"author":1,"featured_media":287,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_locale":"en_US","_original_post":"1243","footnotes":""},"categories":[6],"tags":[118,35,70],"class_list":["post-1260","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","tag-datetime","tag-pandas","tag-70","en-US"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why datetime value is converted to numeric in pandas? - ITips\u30b7\u30b9\u30c6\u30e0\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u30ba<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/itips.krsw.biz\/en\/pandas-datetime-change-numeric-issue\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why datetime value is converted to numeric in pandas? - ITips\u30b7\u30b9\u30c6\u30e0\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u30ba\" \/>\n<meta property=\"og:description\" content=\"Strange thing was happened. 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