{"id":6168,"date":"2024-06-26T16:06:35","date_gmt":"2024-06-26T08:06:35","guid":{"rendered":"https:\/\/t.n-years.com\/?p=6168"},"modified":"2024-06-26T16:06:40","modified_gmt":"2024-06-26T08:06:40","slug":"pandas-%e6%8c%89%e8%a1%8c%e6%88%96%e5%88%97%e6%b8%85%e6%b4%97%e6%88%96%e5%a1%ab%e5%85%85%e6%95%b0%e6%8d%ae","status":"publish","type":"post","link":"https:\/\/t.n-years.com\/?p=6168","title":{"rendered":"Pandas \u6309\u884c\u6216\u5217\u6e05\u6d17\u6216\u586b\u5145\u6570\u636e"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u975e\u539f\u521b\uff0cChatGPT \u95ee\u7b54\u751f\u6210<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 Pandas \u4e2d\uff0c<code>fillna<\/code> \u548c <code>dropna<\/code> \u90fd\u53ef\u4ee5\u57fa\u4e8e\u6574\u4e2a DataFrame \u64cd\u4f5c\uff0c\u4e5f\u53ef\u4ee5\u6309\u884c\u6216\u5217\u8fdb\u884c\u64cd\u4f5c\u3002\u5177\u4f53\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><code>fillna<\/code> \u6309\u884c\u6216\u5217\u586b\u5145<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>fillna<\/code> \u65b9\u6cd5\u53ef\u4ee5\u6307\u5b9a <code>axis<\/code> \u53c2\u6570\u6765\u6309\u884c\u6216\u5217\u586b\u5145\u7f3a\u5931\u503c\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>axis=0<\/code>\uff08\u9ed8\u8ba4\uff09\uff1a\u6309\u5217\u586b\u5145\uff08\u5bf9\u6bcf\u4e00\u5217\u8fdb\u884c\u64cd\u4f5c\uff09\u3002<\/li>\n\n\n\n<li><code>axis=1<\/code>\uff1a\u6309\u884c\u586b\u5145\uff08\u5bf9\u6bcf\u4e00\u884c\u8fdb\u884c\u64cd\u4f5c\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">\u793a\u4f8b\u4ee3\u7801<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>import pandas as pd\nimport numpy as np\n\n# \u521b\u5efa\u5e26\u6709\u7f3a\u5931\u503c\u7684 DataFrame\ndata = {'A': &#91;1, np.nan, 3], 'B': &#91;4, 5, np.nan]}\ndf = pd.DataFrame(data)\n\n# \u6309\u5217\u586b\u5145\u7f3a\u5931\u503c\uff08\u5c06\u6bcf\u5217\u7684\u7f3a\u5931\u503c\u586b\u5145\u4e3a\u8be5\u5217\u7684\u5747\u503c\uff09\ndf_filled_columns = df.apply(lambda col: col.fillna(col.mean()), axis=0)\n\n# \u6309\u884c\u586b\u5145\u7f3a\u5931\u503c\uff08\u5c06\u6bcf\u884c\u7684\u7f3a\u5931\u503c\u586b\u5145\u4e3a\u8be5\u884c\u7684\u5747\u503c\uff09\ndf_filled_rows = df.apply(lambda row: row.fillna(row.mean()), axis=1)\n\nprint(\"\u6309\u5217\u586b\u5145\u7f3a\u5931\u503c\uff1a\")\nprint(df_filled_columns)\nprint(\"\\n\u6309\u884c\u586b\u5145\u7f3a\u5931\u503c\uff1a\")\nprint(df_filled_rows)<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><code>dropna<\/code> \u6309\u884c\u6216\u5217\u4e22\u5f03<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>dropna<\/code> \u65b9\u6cd5\u53ef\u4ee5\u901a\u8fc7 <code>axis<\/code> \u53c2\u6570\u6765\u6307\u5b9a\u6309\u884c\u6216\u5217\u4e22\u5f03\u7f3a\u5931\u503c\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>axis=0<\/code>\uff08\u9ed8\u8ba4\uff09\uff1a\u6309\u884c\u4e22\u5f03\uff08\u4e22\u5f03\u5305\u542b\u7f3a\u5931\u503c\u7684\u884c\uff09\u3002<\/li>\n\n\n\n<li><code>axis=1<\/code>\uff1a\u6309\u5217\u4e22\u5f03\uff08\u4e22\u5f03\u5305\u542b\u7f3a\u5931\u503c\u7684\u5217\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u6b64\u5916\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>thresh<\/code> \u53c2\u6570\u6765\u6307\u5b9a\u9700\u8981\u4fdd\u7559\u7684\u975e\u7f3a\u5931\u503c\u7684\u6570\u91cf\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u793a\u4f8b\u4ee3\u7801<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code># \u6309\u884c\u4e22\u5f03\u7f3a\u5931\u503c\ndf_dropped_rows = df.dropna(axis=0)\n\n# \u6309\u5217\u4e22\u5f03\u7f3a\u5931\u503c\ndf_dropped_columns = df.dropna(axis=1)\n\n# \u8bbe\u7f6e\u9608\u503c\uff0c\u81f3\u5c11\u9700\u89811\u4e2a\u975e\u7f3a\u5931\u503c\ndf_dropped_thresh = df.dropna(thresh=1)\n\nprint(\"\u6309\u884c\u4e22\u5f03\u7f3a\u5931\u503c\uff1a\")\nprint(df_dropped_rows)\nprint(\"\\n\u6309\u5217\u4e22\u5f03\u7f3a\u5931\u503c\uff1a\")\nprint(df_dropped_columns)\nprint(\"\\n\u8bbe\u7f6e\u9608\u503c\u4e22\u5f03\u7f3a\u5931\u503c\uff1a\")\nprint(df_dropped_thresh)<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u793a\u4f8b\u6570\u636e<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5047\u8bbe\u6709\u5982\u4e0b\u6570\u636e\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>data = {'A': &#91;1, np.nan, 3], 'B': &#91;4, 5, np.nan]}\ndf = pd.DataFrame(data)<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u6309\u5217\u586b\u5145\u7f3a\u5931\u503c\uff08\u4f8b\u5982\uff0c\u7528\u5217\u7684\u5747\u503c\u586b\u5145\uff09\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>df_filled_columns = df.apply(lambda col: col.fillna(col.mean()), axis=0)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ed3\u679c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>     A    B\n0  1.0  4.0\n1  2.0  5.0\n2  3.0  4.5<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u6309\u884c\u586b\u5145\u7f3a\u5931\u503c\uff08\u4f8b\u5982\uff0c\u7528\u884c\u7684\u5747\u503c\u586b\u5145\uff09\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>df_filled_rows = df.apply(lambda row: row.fillna(row.mean()), axis=1)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ed3\u679c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>     A    B\n0  1.0  4.0\n1  5.0  5.0\n2  3.0  3.0<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u6309\u884c\u4e22\u5f03\u7f3a\u5931\u503c\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>df_dropped_rows = df.dropna(axis=0)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ed3\u679c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>     A    B\n0  1.0  4.0<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u6309\u5217\u4e22\u5f03\u7f3a\u5931\u503c\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>df_dropped_columns = df.dropna(axis=1)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7ed3\u679c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>     B\n0  4.0\n1  5.0<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u60a8\u53ef\u4ee5\u7075\u6d3b\u5730\u5904\u7406 Pandas DataFrame \u4e2d\u7684\u7f3a\u5931\u503c\uff0c\u6309\u9700\u586b\u5145\u6216\u4e22\u5f03\u7279\u5b9a\u884c\u6216\u5217\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u975e\u539f\u521b\uff0cChatGPT \u95ee\u7b54\u751f\u6210 \u5728 Pandas \u4e2d\uff0cfillna \u548c dropna \u90fd\u53ef\u4ee5\u57fa\u4e8e\u6574\u4e2a Dat&#8230; <\/p>\n<div class=\"read-more navbutton\"><a href=\"https:\/\/t.n-years.com\/?p=6168\">\u9605\u8bfb\u66f4\u591a<i class=\"fa fa-angle-double-right\"><\/i><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-6168","post","type-post","status-publish","format-standard","hentry","category-5"],"_links":{"self":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6168","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=6168"}],"version-history":[{"count":1,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6168\/revisions"}],"predecessor-version":[{"id":6169,"href":"https:\/\/t.n-years.com\/index.php?rest_route=\/wp\/v2\/posts\/6168\/revisions\/6169"}],"wp:attachment":[{"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=6168"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6168"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/t.n-years.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6168"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}