{"id":980204,"date":"2024-12-27T06:52:41","date_gmt":"2024-12-26T22:52:41","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/980204.html"},"modified":"2024-12-27T06:52:43","modified_gmt":"2024-12-26T22:52:43","slug":"python%e5%a6%82%e4%bd%95%e5%8f%96%e6%95%b0%e5%88%97%e4%b8%aa%e6%95%b0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/980204.html","title":{"rendered":"python\u5982\u4f55\u53d6\u6570\u5217\u4e2a\u6570"},"content":{"rendered":"

\"python\u5982\u4f55\u53d6\u6570\u5217\u4e2a\u6570\"<\/p>\n

\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u6765\u83b7\u53d6\u6570\u5217\uff08\u5217\u8868\u3001\u5143\u7ec4\u7b49\uff09\u4e2d\u7684\u5143\u7d20\u4e2a\u6570\uff0c\u5305\u62ec\u4f7f\u7528\u5185\u7f6e\u51fd\u6570len()\u3001\u7edf\u8ba1\u7279\u5b9a\u5143\u7d20\u7684\u51fa\u73b0\u6b21\u6570\uff0c\u4ee5\u53ca\u901a\u8fc7\u5faa\u73af\u7b49\u65b9\u5f0f\u3002\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u4f7f\u7528len()\u51fd\u6570\uff0c\u5b83\u53ef\u4ee5\u5feb\u901f\u3001\u76f4\u63a5\u5730\u8fd4\u56de\u6570\u5217\u7684\u957f\u5ea6\u3002<\/strong><\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528LEN()\u51fd\u6570<\/p>\n<\/p>\n

Python\u4e2d\uff0clen()<\/code>\u51fd\u6570\u662f\u83b7\u53d6\u6570\u5217\u957f\u5ea6\u7684\u6700\u5e38\u7528\u65b9\u6cd5\u3002\u5b83\u53ef\u4ee5\u5e94\u7528\u4e8e\u4efb\u4f55\u652f\u6301\u5e8f\u5217\u534f\u8bae\u7684\u5bf9\u8c61\uff0c\u5305\u62ec\u5217\u8868\u3001\u5143\u7ec4\u3001\u5b57\u7b26\u4e32\u7b49\u3002\u4f7f\u7528\u8be5\u51fd\u6570\u7684\u65b9\u5f0f\u975e\u5e38\u7b80\u5355\uff0c\u53ea\u9700\u5c06\u76ee\u6807\u6570\u5217\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165\u5373\u53ef\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e\u4e00\u4e2a\u5217\u8868\uff0c\u53ef\u4ee5\u901a\u8fc7len(my_list)<\/code>\u6765\u83b7\u53d6\u5176\u957f\u5ea6\u3002<\/p>\n<\/p>\n

\u4e8c\u3001\u8ba1\u6570\u7279\u5b9a\u5143\u7d20<\/p>\n<\/p>\n

\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u77e5\u9053\u67d0\u4e2a\u7279\u5b9a\u5143\u7d20\u5728\u6570\u5217\u4e2d\u51fa\u73b0\u7684\u6b21\u6570\u3002Python\u63d0\u4f9b\u4e86count()<\/code>\u65b9\u6cd5\uff0c\u7528\u4e8e\u7edf\u8ba1\u7279\u5b9a\u5143\u7d20\u7684\u51fa\u73b0\u6b21\u6570\u3002\u8fd9\u4e2a\u65b9\u6cd5\u53ea\u80fd\u7528\u4e8e\u5217\u8868\u548c\u5143\u7ec4\u3002\u4e3e\u4f8b\u6765\u8bf4\uff0c\u5982\u679c\u6709\u4e00\u4e2a\u5217\u8868my_list<\/code>\uff0c\u53ef\u4ee5\u901a\u8fc7my_list.count(element)<\/code>\u6765\u5f97\u5230element<\/code>\u5728\u5217\u8868\u4e2d\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/p>\n<\/p>\n

\u4e09\u3001\u4f7f\u7528\u8fed\u4ee3\u5668<\/p>\n<\/p>\n

\u5bf9\u4e8e\u590d\u6742\u7684\u6570\u636e\u7ed3\u6784\u6216\u81ea\u5b9a\u4e49\u5bf9\u8c61\uff0c\u53ef\u80fd\u9700\u8981\u901a\u8fc7\u5faa\u73af\u6216\u8fed\u4ee3\u5668\u6765\u624b\u52a8\u8ba1\u6570\u3002\u8fd9\u79cd\u65b9\u6cd5\u867d\u7136\u4e0d\u5982len()<\/code>\u65b9\u4fbf\uff0c\u4f46\u5728\u5904\u7406\u81ea\u5b9a\u4e49\u5bf9\u8c61\u6216\u9700\u8981\u5bf9\u5143\u7d20\u8fdb\u884c\u590d\u6742\u5224\u65ad\u65f6\u975e\u5e38\u6709\u6548\u3002\u901a\u8fc7\u904d\u5386\u6570\u5217\uff0c\u53ef\u4ee5\u6839\u636e\u81ea\u5b9a\u4e49\u6761\u4ef6\u8fdb\u884c\u8ba1\u6570\uff0c\u4ece\u800c\u83b7\u53d6\u7b26\u5408\u6761\u4ef6\u7684\u5143\u7d20\u4e2a\u6570\u3002<\/p>\n<\/p>\n

\u56db\u3001\u5e94\u7528\u573a\u666f\u548c\u6ce8\u610f\u4e8b\u9879<\/p>\n<\/p>\n

\u5728\u4e0d\u540c\u7684\u5e94\u7528\u573a\u666f\u4e0b\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u6765\u83b7\u53d6\u6570\u5217\u5143\u7d20\u4e2a\u6570\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u5728\u5904\u7406\u5927\u578b\u6570\u636e\u96c6\u65f6\uff0c\u6027\u80fd\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u8003\u8651\u56e0\u7d20\uff0clen()<\/code>\u51fd\u6570\u7531\u4e8e\u5176\u5b9e\u73b0\u7684\u9ad8\u6548\u6027\uff0c\u901a\u5e38\u662f\u6700\u4f73\u9009\u62e9\u3002\u800c\u5728\u9700\u8981\u9488\u5bf9\u7279\u5b9a\u5143\u7d20\u6216\u590d\u6742\u6761\u4ef6\u8fdb\u884c\u8ba1\u6570\u65f6\uff0c\u8fed\u4ee3\u5668\u548c\u6761\u4ef6\u5224\u65ad\u5219\u66f4\u4e3a\u9002\u7528\u3002\u6b64\u5916\uff0c\u8fd8\u9700\u8981\u6ce8\u610f\u6570\u636e\u7684\u7c7b\u578b\u548c\u7ed3\u6784\uff0c\u4ee5\u907f\u514d\u51fa\u73b0\u9519\u8bef\u3002<\/p>\n<\/p>\n

\u4e94\u3001\u4ee3\u7801\u793a\u4f8b<\/p>\n<\/p>\n

# \u793a\u4f8b\uff1a\u4f7f\u7528len()\u51fd\u6570<\/p>\n
my_list = [1, 2, 3, 4, 5]<\/p>\n
print("\u5217\u8868\u957f\u5ea6:", len(my_list))<\/p>\n
\u793a\u4f8b\uff1a\u8ba1\u6570\u7279\u5b9a\u5143\u7d20<\/strong><\/h2>\n
print("\u6570\u5b573\u51fa\u73b0\u6b21\u6570:", my_list.count(3))<\/p>\n
\u793a\u4f8b\uff1a\u4f7f\u7528\u8fed\u4ee3\u5668\u8fdb\u884c\u81ea\u5b9a\u4e49\u8ba1\u6570<\/strong><\/h2>\n
count = 0<\/p>\n
for item in my_list:<\/p>\n
    if item > 2:  # \u81ea\u5b9a\u4e49\u6761\u4ef6<\/p>\n
        count += 1<\/p>\n
print("\u5927\u4e8e2\u7684\u5143\u7d20\u4e2a\u6570:", count)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u5408\u7406\u9009\u62e9\u548c\u4f7f\u7528\u4ee5\u4e0a\u65b9\u6cd5\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u83b7\u53d6\u6570\u5217\u4e2d\u5143\u7d20\u7684\u4e2a\u6570\uff0c\u4ee5\u6ee1\u8db3\u4e0d\u540c\u7684\u7f16\u7a0b\u9700\u6c42\u548c\u5e94\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u8ba1\u7b97\u4e00\u4e2a\u6570\u5217\u7684\u5143\u7d20\u6570\u91cf\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u7684len()<\/code>\u51fd\u6570\u6765\u8ba1\u7b97\u4e00\u4e2a\u6570\u5217\u7684\u5143\u7d20\u6570\u91cf\u3002\u8be5\u51fd\u6570\u63a5\u53d7\u4e00\u4e2a\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff08\u5982\u5217\u8868\u3001\u5143\u7ec4\u6216\u5b57\u7b26\u4e32\uff09\u4f5c\u4e3a\u53c2\u6570\uff0c\u5e76\u8fd4\u56de\u5176\u957f\u5ea6\u3002\u4f8b\u5982\uff0c\u4f7f\u7528len([1, 2, 3, 4])<\/code>\u5c06\u8fd4\u56de4\uff0c\u56e0\u4e3a\u8be5\u5217\u8868\u4e2d\u6709\u56db\u4e2a\u5143\u7d20\u3002<\/p>\n
\u5982\u679c\u6211\u60f3\u8ba1\u7b97\u7279\u5b9a\u6761\u4ef6\u4e0b\u7684\u5143\u7d20\u6570\u91cf\uff0c\u5e94\u8be5\u600e\u4e48\u505a\uff1f<\/strong>
\u53ef\u4ee5\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f\u7ed3\u5408len()<\/code>\u51fd\u6570\u6765\u8ba1\u7b97\u6ee1\u8db3\u7279\u5b9a\u6761\u4ef6\u7684\u5143\u7d20\u6570\u91cf\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u4f60\u6709\u4e00\u4e2a\u5217\u8868numbers = [1, 2, 3, 4, 5]<\/code>\uff0c\u8981\u8ba1\u7b97\u5176\u4e2d\u5927\u4e8e3\u7684\u5143\u7d20\u6570\u91cf\uff0c\u53ef\u4ee5\u4f7f\u7528len([num for num in numbers if num > 3])<\/code>\uff0c\u8fd9\u5c06\u8fd4\u56de2\uff0c\u56e0\u4e3a\u5217\u8868\u4e2d\u6709\u4e24\u4e2a\u5143\u7d20\uff084\u548c5\uff09\u6ee1\u8db3\u6761\u4ef6\u3002<\/p>\n
\u5728Python\u4e2d\u6709\u6ca1\u6709\u5176\u4ed6\u65b9\u6cd5\u53ef\u4ee5\u7edf\u8ba1\u5143\u7d20\u6570\u91cf\uff1f<\/strong>
\u9664\u4e86\u4f7f\u7528len()<\/code>\u51fd\u6570\u5916\uff0ccollections<\/code>\u6a21\u5757\u4e2d\u7684Counter<\/code>\u7c7b\u4e5f\u662f\u4e00\u4e2a\u975e\u5e38\u65b9\u4fbf\u7684\u5de5\u5177\u3002\u901a\u8fc7Counter<\/code>\uff0c\u4f60\u53ef\u4ee5\u8f7b\u677e\u7edf\u8ba1\u5217\u8868\u4e2d\u6bcf\u4e2a\u5143\u7d20\u7684\u51fa\u73b0\u6b21\u6570\u3002\u4f8b\u5982\uff0c\u6267\u884cfrom collections import Counter; counts = Counter([1, 2, 2, 3, 3, 3])<\/code>\uff0c\u7136\u540e\u4f7f\u7528counts<\/code>\u53ef\u4ee5\u67e5\u770b\u6bcf\u4e2a\u5143\u7d20\u53ca\u5176\u51fa\u73b0\u6b21\u6570\uff0c\u8fd9\u5bf9\u4e8e\u5206\u6790\u6570\u636e\u96c6\u975e\u5e38\u6709\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u6765\u83b7\u53d6\u6570\u5217\uff08\u5217\u8868\u3001\u5143\u7ec4\u7b49\uff09\u4e2d\u7684\u5143\u7d20\u4e2a\u6570\uff0c\u5305\u62ec\u4f7f\u7528\u5185\u7f6e\u51fd\u6570len()\u3001\u7edf\u8ba1\u7279\u5b9a […]","protected":false},"author":3,"featured_media":980212,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/980204"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=980204"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/980204\/revisions"}],"predecessor-version":[{"id":980214,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/980204\/revisions\/980214"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/980212"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=980204"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=980204"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=980204"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}