![\"python\u5982\u4f55\u63d0\u53d6\u5217\u8868\u4e2d\u5143\u7d20\u7684\u4f4d\u7f6e\"](\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2024\/12\/07cd9870-3c20-447d-a55b-551ca36bed87.webp?x-oss-process=image\/auto-orient,1\/format,webp\")
<\/p>\n<\/p>\n
Python \u63d0\u53d6\u5217\u8868\u4e2d\u5143\u7d20\u7684\u4f4d\u7f6e\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5305\u62ec\u4f7f\u7528 \u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528 my_list = ['a', 'b', 'c', 'd', 'a']<\/p>\n position = my_list.index('a')<\/p>\n print(position) # \u8f93\u51fa\uff1a0<\/p>\n <\/code><\/pre>\n<\/p>\n \u5f53\u5217\u8868\u4e2d\u5b58\u5728\u591a\u4e2a\u76f8\u540c\u5143\u7d20\u65f6\uff0c my_list = ['a', 'b', 'c', 'd', 'a']<\/p>\n positions = [index for index, value in enumerate(my_list) if value == 'a']<\/p>\n print(positions) # \u8f93\u51fa\uff1a[0, 4]<\/p>\n <\/code><\/pre>\n<\/p>\n \u5bf9\u4e8e\u5305\u542b\u5927\u91cf\u6570\u636e\u7684\u5217\u8868\uff0c my_list = ['a', 'b', 'c', 'd', 'a']<\/p>\n my_array = np.array(my_list)<\/p>\n positions = np.where(my_array == 'a')[0]<\/p>\n print(positions) # \u8f93\u51fa\uff1a[0 4]<\/p>\n <\/code><\/pre>\n<\/p>\n my_list = ['a', 'b', 'c', 'd', 'a']<\/p>\n my_series = pd.Series(my_list)<\/p>\n positions = my_series[my_series == 'a'].index.tolist()<\/p>\n print(positions) # \u8f93\u51fa\uff1a[0, 4]<\/p>\n <\/code><\/pre>\n<\/p>\n \u7ed3\u5408 my_list = ['a', 'b', 'c', 'd', 'a']<\/p>\n positions = list(filter(lambda x: my_list[x] == 'a', range(len(my_list))))<\/p>\n print(positions) # \u8f93\u51fa\uff1a[0, 4]<\/p>\n <\/code><\/pre>\n<\/p>\n \u624b\u52a8\u904d\u5386\u5217\u8868\u662f\u4e00\u79cd\u901a\u7528\u65b9\u6cd5\uff0c\u53ef\u4ee5\u9002\u7528\u4e8e\u4efb\u4f55\u60c5\u51b5\u3002<\/p>\n<\/p>\n my_list = ['a', 'b', 'c', 'd', 'a']<\/p>\n positions = []<\/p>\n for index, value in enumerate(my_list):<\/p>\n if value == 'a':<\/p>\n positions.append(index)<\/p>\n print(positions) # \u8f93\u51fa\uff1a[0, 4]<\/p>\n <\/code><\/pre>\n<\/p>\n \u624b\u52a8\u904d\u5386\u5217\u8868\u867d\u7136\u4ee3\u7801\u7a0d\u663e\u5197\u957f\uff0c\u4f46\u903b\u8f91\u6e05\u6670\uff0c\u9002\u5408\u521d\u5b66\u8005\u7406\u89e3\u548c\u5b66\u4e60\u3002<\/p>\n<\/p>\n \u5bf9\u4e8e\u5305\u542b\u590d\u6742\u6a21\u5f0f\u5339\u914d\u7684\u5143\u7d20\uff0c\u53ef\u4ee5\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\uff08 my_list = ['a', 'b', 'c', 'd', 'a']<\/p>\n pattern = re.compile(r'a')<\/p>\n positions = [index for index, value in enumerate(my_list) if pattern.match(value)]<\/p>\n print(positions) # \u8f93\u51fa\uff1a[0, 4]<\/p>\n <\/code><\/pre>\n<\/p>\n \u6b63\u5219\u8868\u8fbe\u5f0f\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u6a21\u5f0f\u5339\u914d\u529f\u80fd\uff0c\u9002\u7528\u4e8e\u66f4\u52a0\u590d\u6742\u7684\u5339\u914d\u9700\u6c42\u3002<\/p>\n<\/p>\n \u63d0\u53d6\u5217\u8868\u4e2d\u5143\u7d20\u7684\u4f4d\u7f6e\u5728\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u4e2d\u975e\u5e38\u5e38\u89c1\u3002\u6839\u636e\u5b9e\u9645\u9700\u6c42\u548c\u6570\u636e\u91cf\u7684\u4e0d\u540c\uff0c\u53ef\u4ee5\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u6765\u9ad8\u6548\u5730\u5b8c\u6210\u4efb\u52a1\u3002 \u5982\u4f55\u5728Python\u4e2d\u627e\u5230\u5217\u8868\u4e2d\u67d0\u4e2a\u5143\u7d20\u7684\u7d22\u5f15\uff1f<\/strong> \u5982\u679c\u5217\u8868\u4e2d\u6709\u591a\u4e2a\u76f8\u540c\u7684\u5143\u7d20\uff0c\u5982\u4f55\u63d0\u53d6\u6240\u6709\u4f4d\u7f6e\uff1f<\/strong> \u5982\u4f55\u5904\u7406\u5728\u5217\u8868\u4e2d\u627e\u4e0d\u5230\u5143\u7d20\u7684\u60c5\u51b5\uff1f<\/strong>index<\/code> \u65b9\u6cd5\u3001\u5217\u8868\u63a8\u5bfc\u5f0f\u3001\u679a\u4e3e\uff08enumerate<\/code>\uff09\u4ee5\u53ca\u5176\u4ed6\u9ad8\u7ea7\u65b9\u6cd5\u3002<\/strong> \u5176\u4e2d\u6700\u5e38\u7528\u7684\u662f index<\/code> \u65b9\u6cd5\uff0c\u4f46\u5b83\u53ea\u80fd\u8fd4\u56de\u7b2c\u4e00\u4e2a\u5339\u914d\u5143\u7d20\u7684\u4f4d\u7f6e\u3002\u82e5\u8981\u83b7\u53d6\u6240\u6709\u5339\u914d\u5143\u7d20\u7684\u4f4d\u7f6e\uff0c\u53ef\u4ee5\u7ed3\u5408 enumerate<\/code> \u4f7f\u7528\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u4e00\u79cd\u65b9\u6cd5\u3002<\/p>\n<\/p>\nindex<\/code> \u65b9\u6cd5<\/strong><\/p>\n<\/p>\n# \u4f7f\u7528 index \u65b9\u6cd5\u83b7\u53d6\u5143\u7d20\u4f4d\u7f6e<\/p>\nindex<\/code> \u65b9\u6cd5\u53ea\u80fd\u8fd4\u56de\u7b2c\u4e00\u4e2a\u5339\u914d\u5143\u7d20\u7684\u4f4d\u7f6e\uff0c\u5982\u679c\u5217\u8868\u4e2d\u6709\u591a\u4e2a\u76f8\u540c\u5143\u7d20\uff0c\u4e14\u9700\u8981\u83b7\u53d6\u6240\u6709\u5339\u914d\u5143\u7d20\u7684\u4f4d\u7f6e\uff0c\u53ef\u4ee5\u4f7f\u7528 enumerate<\/code> \u65b9\u6cd5\u3002<\/p>\n<\/p>\n
\n\u4e00\u3001\u4f7f\u7528
enumerate<\/code> \u65b9\u6cd5<\/h3>\n<\/p>\nenumerate<\/code> \u65b9\u6cd5\u53ef\u4ee5\u83b7\u53d6\u6240\u6709\u5339\u914d\u5143\u7d20\u7684\u4f4d\u7f6e\u3002<\/p>\n<\/p>\n# \u4f7f\u7528 enumerate \u65b9\u6cd5\u83b7\u53d6\u6240\u6709\u5339\u914d\u5143\u7d20\u7684\u4f4d\u7f6e<\/p>\nenumerate<\/code> \u4f1a\u4e3a\u5217\u8868\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u751f\u6210\u4e00\u4e2a\u7d22\u5f15\u548c\u503c\u7684\u5143\u7ec4\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5217\u8868\u63a8\u5bfc\u5f0f\u7b5b\u9009\u51fa\u6240\u6709\u5339\u914d\u7684\u5143\u7d20\u4f4d\u7f6e\u3002<\/p>\n<\/p>\n\u4e8c\u3001\u4f7f\u7528
numpy<\/code> \u5e93<\/h3>\n<\/p>\nnumpy<\/code> \u5e93\u63d0\u4f9b\u4e86\u66f4\u9ad8\u6548\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<\/p>\nimport numpy as np<\/p>\n\u4f7f\u7528 numpy \u83b7\u53d6\u6240\u6709\u5339\u914d\u5143\u7d20\u7684\u4f4d\u7f6e<\/strong><\/h2>\n
numpy<\/code> \u7684 where<\/code> \u51fd\u6570\u8fd4\u56de\u6ee1\u8db3\u6761\u4ef6\u7684\u7d22\u5f15\u4f4d\u7f6e\uff0c\u6548\u7387\u9ad8\u4e14\u4ee3\u7801\u7b80\u6d01\u3002<\/p>\n<\/p>\n\u4e09\u3001\u4f7f\u7528
pandas<\/code> \u5e93<\/h3>\n<\/p>\npandas<\/code> \u5e93\u4e5f\u53ef\u4ee5\u7528\u4e8e\u63d0\u53d6\u5217\u8868\u4e2d\u5143\u7d20\u7684\u4f4d\u7f6e\uff0c\u7279\u522b\u662f\u5f53\u6570\u636e\u5904\u7406\u6d89\u53ca\u5230\u66f4\u591a\u590d\u6742\u64cd\u4f5c\u65f6\u3002<\/p>\n<\/p>\nimport pandas as pd<\/p>\n\u4f7f\u7528 pandas \u83b7\u53d6\u6240\u6709\u5339\u914d\u5143\u7d20\u7684\u4f4d\u7f6e<\/strong><\/h2>\n
pandas<\/code> \u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u6570\u636e\u5904\u7406\u529f\u80fd\uff0c\u5bf9\u4e8e\u6570\u636e\u5206\u6790\u4efb\u52a1\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n\u56db\u3001\u4f7f\u7528
filter<\/code> \u548c lambda<\/code> \u8868\u8fbe\u5f0f<\/h3>\n<\/p>\nfilter<\/code> \u548c lambda<\/code> \u8868\u8fbe\u5f0f\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u63d0\u53d6\u5217\u8868\u4e2d\u5143\u7d20\u7684\u4f4d\u7f6e\u3002<\/p>\n<\/p>\n# \u4f7f\u7528 filter \u548c lambda \u8868\u8fbe\u5f0f\u83b7\u53d6\u6240\u6709\u5339\u914d\u5143\u7d20\u7684\u4f4d\u7f6e<\/p>\nfilter<\/code> \u51fd\u6570\u7ed3\u5408 lambda<\/code> \u8868\u8fbe\u5f0f\uff0c\u53ef\u4ee5\u5b9e\u73b0\u9ad8\u6548\u7684\u7b5b\u9009\u64cd\u4f5c\u3002<\/p>\n<\/p>\n\u4e94\u3001\u624b\u52a8\u904d\u5386\u5217\u8868<\/h3>\n<\/p>\n
# \u624b\u52a8\u904d\u5386\u5217\u8868\u83b7\u53d6\u6240\u6709\u5339\u914d\u5143\u7d20\u7684\u4f4d\u7f6e<\/p>\n\u516d\u3001\u7ed3\u5408\u6b63\u5219\u8868\u8fbe\u5f0f<\/h3>\n<\/p>\n
re<\/code> \u6a21\u5757\uff09\u3002<\/p>\n<\/p>\nimport re<\/p>\n\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u83b7\u53d6\u6240\u6709\u5339\u914d\u5143\u7d20\u7684\u4f4d\u7f6e<\/strong><\/h2>\n
\u4e03\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
index<\/code> \u65b9\u6cd5\u3001enumerate<\/code>\u3001numpy<\/code> \u5e93\u3001pandas<\/code> \u5e93\u3001filter<\/code> \u548c lambda<\/code> \u8868\u8fbe\u5f0f\u3001\u624b\u52a8\u904d\u5386\u4ee5\u53ca\u6b63\u5219\u8868\u8fbe\u5f0f<\/strong> \u5404\u6709\u4f18\u52a3\uff0c\u638c\u63e1\u5b83\u4eec\u53ef\u4ee5\u8ba9\u4f60\u5728\u4e0d\u540c\u573a\u666f\u4e2d\u7075\u6d3b\u5e94\u7528\u3002<\/p>\n<\/p>\n\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528list.index()<\/code>\u65b9\u6cd5\u6765\u67e5\u627e\u67d0\u4e2a\u5143\u7d20\u7684\u7d22\u5f15\u3002\u4f8b\u5982\uff0c\u5982\u679c\u4f60\u6709\u4e00\u4e2a\u5217\u8868my_list = [10, 20, 30, 40]<\/code>\uff0c\u60f3\u627e\u5230\u5143\u7d2030<\/code>\u7684\u4f4d\u7f6e\uff0c\u53ef\u4ee5\u4f7f\u7528my_list.index(30)<\/code>\uff0c\u8be5\u65b9\u6cd5\u5c06\u8fd4\u56de2<\/code>\uff0c\u56e0\u4e3a30<\/code>\u5728\u5217\u8868\u4e2d\u7684\u7d22\u5f15\u662f2\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5982\u679c\u5143\u7d20\u5728\u5217\u8868\u4e2d\u4e0d\u5b58\u5728\uff0c\u5c06\u4f1a\u5f15\u53d1ValueError<\/code>\u5f02\u5e38\u3002<\/p>\n
\u5982\u679c\u4f60\u60f3\u627e\u5230\u5217\u8868\u4e2d\u6240\u6709\u5339\u914d\u5143\u7d20\u7684\u4f4d\u7f6e\uff0c\u53ef\u4ee5\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f\u7ed3\u5408enumerate()<\/code>\u51fd\u6570\u3002\u4f8b\u5982\uff0c\u7ed9\u5b9a\u5217\u8868my_list = [10, 20, 30, 20, 40]<\/code>\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u63d0\u53d6\u6240\u670920<\/code>\u7684\u7d22\u5f15\uff1a[index for index, value in enumerate(my_list) if value == 20]<\/code>\u3002\u8fd9\u5c06\u8fd4\u56de[1, 3]<\/code>\uff0c\u8868\u793a20<\/code>\u51fa\u73b0\u5728\u7d22\u5f151\u548c\u7d22\u5f153\u7684\u4f4d\u7f6e\u3002<\/p>\n
\u5728\u67e5\u627e\u5143\u7d20\u4f4d\u7f6e\u65f6\uff0c\u5982\u679c\u4e0d\u786e\u5b9a\u5143\u7d20\u662f\u5426\u5b58\u5728\u4e8e\u5217\u8868\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u6765\u63d0\u524d\u68c0\u67e5\u3002\u4f8b\u5982\uff0c\u4f7f\u7528if 50 in my_list:<\/code>\u53ef\u4ee5\u5224\u65ad50<\/code>\u662f\u5426\u5728my_list<\/code>\u4e2d\uff0c\u63a5\u7740\u518d\u8c03\u7528index()<\/code>\u65b9\u6cd5\u3002\u5982\u679c\u5143\u7d20\u4e0d\u5b58\u5728\uff0c\u53ef\u4ee5\u4f7f\u7528print("\u5143\u7d20\u4e0d\u5728\u5217\u8868\u4e2d")<\/code>\u7b49\u65b9\u5f0f\u5904\u7406\u8fd9\u79cd\u60c5\u51b5\uff0c\u907f\u514d\u7a0b\u5e8f\u5d29\u6e83\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python \u63d0\u53d6\u5217\u8868\u4e2d\u5143\u7d20\u7684\u4f4d\u7f6e\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5305\u62ec\u4f7f\u7528 index \u65b9\u6cd5\u3001\u5217\u8868\u63a8\u5bfc\u5f0f\u3001\u679a\u4e3e\uff08enumerat […]","protected":false},"author":3,"featured_media":1062214,"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\/1062208"}],"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=1062208"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1062208\/revisions"}],"predecessor-version":[{"id":1062216,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1062208\/revisions\/1062216"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1062214"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1062208"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1062208"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1062208"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}