{"id":586,"date":"2017-04-22T16:45:59","date_gmt":"2017-04-22T08:45:59","guid":{"rendered":"http:\/\/www.mrtblog.cn\/?p=586"},"modified":"2023-03-05T15:57:08","modified_gmt":"2023-03-05T07:57:08","slug":"pandas%e5%b8%b8%e7%94%a8%e5%87%bd%e6%95%b0%e8%ae%b0%e5%bd%95","status":"publish","type":"post","link":"http:\/\/www.mrtblog.cn\/?p=586","title":{"rendered":"pandas\u5e38\u7528\u51fd\u6570\u8bb0\u5f55"},"content":{"rendered":"
<\/span> 1,447<\/span> Views<\/span><\/div>

\u51fd\u6570\u540d\uff1apandas.read_csv()<\/strong><\/span>
\n \u4f5c\u7528\uff1a\u8bfb\u53d6csv\u6587\u4ef6\u5185\u5bb9<\/strong><\/span>
\n \u8fd4\u56de\u503c\uff1adataFrame<\/strong><\/span><\/p>\n\n\n\n\n\n\n\n\n
\u5e38\u7528\u53c2\u6570<\/strong><\/td>\n\u53d6\u503c<\/b><\/td>\n\u4f5c\u7528<\/strong><\/td>\n<\/tr>\n
filepath_or_buffer<\/em><\/td>\nstr<\/td>\n\u8bfb\u53d6\u6587\u4ef6\u7684\u8def\u5f84<\/td>\n<\/tr>\n
sep<\/em><\/td>\nchar<\/td>\n\u5207\u5206\u5b57\u7b26\u4e32\u7684\u6807\u8bc6\u7b26<\/td>\n<\/tr>\n
header<\/em><\/td>\ninfer\u6216None<\/td>\n\u5224\u65ad\u8bfb\u53d6\u7684csv\u662f\u5426\u6709\u6807\u9898\u884c<\/td>\n<\/tr>\n
chunksize<\/em><\/td>\nint<\/td>\n\u6309\u6307\u5b9a\u5927\u5c0f\u5206\u5757\u8bfb\u6587\u4ef6<\/td>\n<\/tr>\n
encoding<\/em><\/td>\nstr<\/td>\n\u6309\u6307\u5b9a\u7f16\u7801\u8bfb\u6587\u4ef6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n

\u51fd\u6570\u540d\uff1apandas.concat()<\/strong><\/span>
\n \u4f5c\u7528\uff1a\u591a\u4e2a\u5bf9\u8c61\u8fde\u63a5\u4e3a\u4e00\u4e2a\u5bf9\u8c61<\/strong><\/span>
\n\u8fd4\u56de\u503c\uff1aobj(dataFrame\u7b49)<\/strong><\/span><\/p>\n\n\n\n\n\n
\u5e38\u7528\u53c2\u6570<\/strong><\/td>\n\u53d6\u503c<\/b><\/td>\n\u4f5c\u7528<\/strong><\/td>\n<\/tr>\n
objs<\/em><\/td>\ndataframe\/series\/…<\/td>\n\u8bfb\u53d6\u5bf9\u8c61\u96c6\u5408<\/td>\n<\/tr>\n
ignore_index<\/em><\/td>\nbool<\/td>\n\u4fdd\u5b58\/\u53d6\u6d88\u7d22\u5f15<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n

\u51fd\u6570\u540d\uff1a<\/strong><\/span>pandas.DataFrame.groupby()<\/strong>
\n\u4f5c\u7528\uff1a\u6309\u6307\u5b9a\u8981\u6c42\u5c06dataframe\u5212\u5206\u6210\u7ec4<\/strong><\/span>
\n\u8fd4\u56de\u503c\uff1aobj(Groupby)<\/strong><\/span><\/p>\n\n\n\n\n\n
\u5e38\u7528\u53c2\u6570<\/strong><\/td>\n\u53d6\u503c<\/b><\/td>\n\u4f5c\u7528<\/strong><\/td>\n<\/tr>\n
by<\/em><\/td>\ndataframe\u4e2d\u7684\u67d0\u51e0\u5217\u540d<\/td>\n\u5206\u7ec4\u7684\u4f9d\u636e<\/td>\n<\/tr>\n
as_index<\/em><\/td>\nbool<\/td>\n\u8f93\u51fa\u98ce\u683c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u51fd\u6570\u540d\uff1a<\/strong><\/span>pandas.DataFrame.apply()<\/strong>
\n\u4f5c\u7528\uff1a\u7edf\u8ba1\u5206\u7ec4\u540e\u7684\u7d2f\u8ba1\u4fe1\u606f<\/strong><\/span>
\n\u8fd4\u56de\u503c\uff1aobj(dataframe)<\/strong><\/span><\/p>\n\n\n\n\n\n
\u5e38\u7528\u53c2\u6570<\/strong><\/td>\n\u53d6\u503c<\/b><\/td>\n\u4f5c\u7528<\/strong><\/td>\n<\/tr>\n
func<\/i><\/td>\n\u51fd\u6570<\/td>\n\u8c03\u7528\u51fd\u6570\u5bf9dataframe\u64cd\u4f5c<\/td>\n<\/tr>\n
as_index<\/em><\/td>\nbool<\/td>\n\u8f93\u51fa\u98ce\u683c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5c06groupby\u548capply\u7ed3\u5408\u8d77\u6765\uff0c\u662f\u5e38\u7528\u7684\u5904\u7406\u65b9\u5f0f\uff0c\u4e00\u5f20\u56fe\u80fd\u5f88\u7b80\u5355\u7684\u8bf4\u660e\u7528\u6cd5<\/p>\n

\"\"<\/a><\/p>\n

\n

\u51fd\u6570\u540d\uff1apandas.dataframe.ix()<\/strong><\/span>
\n \u4f5c\u7528\uff1a\u6309\u7167\u7d22\u5f15\u7684\u65b9\u5f0f\u8bfb\u53d6dataframe<\/strong><\/span>
\n \u8fd4\u56de\u503c\uff1adataFrame<\/strong><\/span><\/p>\n\n\n\n\n\n
\u5e38\u7528\u53c2\u6570<\/strong><\/td>\n\u53d6\u503c<\/b><\/td>\n\u4f5c\u7528<\/strong><\/td>\n<\/tr>\n
p1<\/i><\/td>\ncondition<\/td>\n\u4f9d\u636ep1\u5bf9\u9009\u53d6\u7684\u5217\u7b5b\u9009<\/td>\n<\/tr>\n
p2<\/i><\/td>\nstring\u6216int<\/td>\n\u9009\u53d6 dataframe\u7684p2\u5217<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n

\u51fd\u6570\u540d\uff1apandas.dataframe.isin(obj)<\/strong><\/span>
\n\u4f5c\u7528\uff1a\u4ecedataframe\u7b5b\u9009\u51fa\u5728obj\u91cc\u51fa\u73b0\u7684\u6570\u636e\u9879<\/strong><\/span>
\n\u8fd4\u56de\u503c\uff1adataFrame<\/strong><\/span><\/p>\n\n\n\n\n
\u5e38\u7528\u53c2\u6570<\/strong><\/td>\n\u53d6\u503c<\/b><\/td>\n\u4f5c\u7528<\/strong><\/td>\n<\/tr>\n
values<\/em>
\n<\/i><\/td>\n		list\u6216dict\u6216dataframe<\/td>\n\u6309\u7167values\u5bf9dataframe\u7b5b\u9009\uff0c\u5176\u4e2dvalues=list\u4e3a\u5305\u542b\u7b5b\u9009\uff0c\u5176\u4ed6\u4e3a\u4e00\u4e00\u5bf9\u5e94\u7b5b\u9009<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n

\u51fd\u6570\u540d\uff1apandas.dataframe.merge()<\/strong><\/span>
\n\u4f5c\u7528\uff1a\u4e24\u4e2adataframe\u5408\u5e76<\/strong><\/span>
\n\u8fd4\u56de\u503c\uff1adataFrame<\/strong><\/span><\/p>\n\n\n\n\n\n\n\n
\u5e38\u7528\u53c2\u6570<\/strong><\/td>\n\u53d6\u503c<\/b><\/td>\n\u4f5c\u7528<\/strong><\/td>\n<\/tr>\n
left <\/i><\/td>\ndataframe<\/td>\n\u7528\u4e8e\u5408\u5e76\u7684dataframe<\/td>\n<\/tr>\n
right<\/i><\/td>\ndataframe<\/td>\n\u7528\u4e8e\u5408\u5e76\u7684dataframe<\/td>\n<\/tr>\n
on <\/i><\/td>\n(dataframe row name)<\/td>\n\u6309\u7167dataframe\u7684\u67d0\u51e0\u5217\u503c\u5408\u5e76<\/td>\n<\/tr>\n
how <\/i><\/td>\ninner\/left\/right\/outer<\/td>\n\u9009\u62e9\u5408\u5e76\u7684\u65b9\u5f0f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

1,447 Views\u51fd\u6570\u540d\uff1apandas.read_csv() \u4f5c\u7528\uff1a\u8bfb\u53d6csv\u6587\u4ef6\u5185\u5bb9 \u8fd4\u56de\u503c\uff1adataF […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[107],"tags":[94,43],"class_list":["post-586","post","type-post","status-publish","format-standard","hentry","category-python","tag-pandas","tag-python"],"_links":{"self":[{"href":"http:\/\/www.mrtblog.cn\/index.php?rest_route=\/wp\/v2\/posts\/586","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.mrtblog.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.mrtblog.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.mrtblog.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.mrtblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=586"}],"version-history":[{"count":11,"href":"http:\/\/www.mrtblog.cn\/index.php?rest_route=\/wp\/v2\/posts\/586\/revisions"}],"predecessor-version":[{"id":1205,"href":"http:\/\/www.mrtblog.cn\/index.php?rest_route=\/wp\/v2\/posts\/586\/revisions\/1205"}],"wp:attachment":[{"href":"http:\/\/www.mrtblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=586"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.mrtblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=586"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.mrtblog.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=586"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}