{"id":3442,"date":"2025-05-30T14:46:59","date_gmt":"2025-06-04T07:43:58","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=3442"},"modified":"2025-06-04T14:46:59","modified_gmt":"2025-06-04T07:43:58","slug":"%e4%ba%86%e8%a7%a3python%e4%b8%ad%e7%9a%84get%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/python\/%e4%ba%86%e8%a7%a3python%e4%b8%ad%e7%9a%84get%e6%96%b9%e6%b3%95\/","title":{"rendered":"2025 \u6700\u65b0\u7248\uff1a\u6df1\u5165\u4e86\u89e3 Python \u4e2d\u7684 get() \u65b9\u6cd5\u53ca\u5176\u6700\u4f73\u5be6\u8e10"},"content":{"rendered":"

<\/p>\n

\u6df1\u5165\u4e86\u89e3 Python \u4e2d\u7684 get() \u65b9\u6cd5<\/h1>\n

\u57282025\u5e74\uff0cPython \u7684 get() \u65b9\u6cd5\u4f9d\u7136\u662f\u5b57\u5178\u64cd\u4f5c\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002\u5b83\u8b93\u958b\u767c\u8005\u80fd\u5920\u5b89\u5168\u5730\u5f9e\u5b57\u5178\u4e2d\u7372\u53d6\u7279\u5b9a\u7684\u503c\uff0c\u800c\u7121\u9700\u64d4\u5fc3\u8a72\u9375\u4e0d\u5b58\u5728\u7684\u60c5\u6cc1\u3002\u672c\u6587\u5c07\u4ecb\u7d39 get() \u65b9\u6cd5\u7684\u6700\u65b0\u8a9e\u6cd5\u3001\u5be6\u4f5c\u7bc4\u4f8b\u3001\u932f\u8aa4\u6392\u9664\u4ee5\u53ca\u5ef6\u4f38\u61c9\u7528\uff0c\u5e6b\u52a9\u4f60\u5728 Python \u5c08\u6848\u4e2d\u6709\u6548\u904b\u7528\u6b64\u529f\u80fd\u3002<\/p>\n

## get() \u65b9\u6cd5\u7684\u8a9e\u6cd5<\/p>\n

get() \u65b9\u6cd5\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

“`python
\ndict.get(key[, default])
\n“`<\/p>\n

– **key**: \u4f60\u8981\u53d6\u5f97\u7684\u503c\u7684\u9375\u3002
\n– **default**: \u53ef\u9078\u53c3\u6578\uff0c\u7576\u5b57\u5178\u4e2d\u6c92\u6709\u8a72\u503c\u6642\uff0c\u6703\u56de\u50b3\u6b64\u503c\u3002\u5982\u679c\u4e0d\u6307\u5b9a\uff0c\u5247\u9810\u8a2d\u56de\u50b3 None\u3002<\/p>\n

## \u4f7f\u7528\u7bc4\u4f8b<\/p>\n

\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u5b57\u5178\uff0c\u540d\u70ba `my_dict`\uff1a<\/p>\n

“`python
\nmy_dict = {
\n ‘name’: ‘John’,
\n ‘age’: 20
\n}
\n“`<\/p>\n

### \u7372\u53d6\u5b58\u5728\u7684\u9375\u503c<\/p>\n

\u5982\u679c\u6211\u5011\u60f3\u8981\u53d6\u5f97 `name` \u7684\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u7a0b\u5f0f\u78bc\uff1a<\/p>\n

“`python
\nname = my_dict.get(‘name’)
\nprint(name) # \u8f38\u51fa: John
\n“`<\/p>\n

### \u7372\u53d6\u4e0d\u5b58\u5728\u7684\u9375\u503c<\/p>\n

\u5c0d\u65bc\u4e0d\u5b58\u5728\u7684\u9375\uff0c\u6211\u5011\u53ef\u4ee5\u6307\u5b9a\u4e00\u500b default \u503c\uff1a<\/p>\n

“`python
\ngender = my_dict.get(‘gender’, ‘Unknown’)
\nprint(gender) # \u8f38\u51fa: Unknown
\n“`<\/p>\n

### \u6aa2\u67e5\u9375\u662f\u5426\u5b58\u5728<\/p>\n

get() \u65b9\u6cd5\u4e5f\u80fd\u7528\u4f86\u6aa2\u67e5\u67d0\u500b\u9375\u662f\u5426\u5b58\u5728\u65bc\u5b57\u5178\u4e2d\uff1a<\/p>\n

“`python
\nif my_dict.get(‘name’):
\n print(‘Name exists!’) # \u8f38\u51fa: Name exists!
\n“`<\/p>\n

### \u932f\u8aa4\u6392\u9664<\/p>\n

\u5728\u4f7f\u7528 get() \u65b9\u6cd5\u6642\uff0c\u5982\u679c\u4f60\u7121\u6cd5\u7372\u53d6\u9810\u671f\u7684\u503c\uff0c\u8acb\u6aa2\u67e5\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n

1. \u78ba\u4fdd\u9375\u7684\u540d\u7a31\u62fc\u5beb\u6b63\u78ba\u3002
\n2. \u78ba\u4fdd\u5b57\u5178\u4e2d\u78ba\u5be6\u5b58\u5728\u8a72\u9375\u3002
\n3. \u5982\u679c\u4f7f\u7528 default \u53c3\u6578\uff0c\u8acb\u6aa2\u67e5\u5176\u503c\u662f\u5426\u7b26\u5408\u9810\u671f\u3002<\/p>\n

### \u5ef6\u4f38\u61c9\u7528<\/p>\n

– **\u5408\u4f75\u5b57\u5178**: \u5728\u5408\u4f75\u591a\u500b\u5b57\u5178\u6642\uff0cget() \u65b9\u6cd5\u53ef\u4ee5\u7528\u4f86\u7372\u53d6\u9375\u503c\uff0c\u800c\u4e0d\u6703\u56e0\u70ba\u67d0\u4e9b\u9375\u4e0d\u5b58\u5728\u800c\u9020\u6210\u932f\u8aa4\u3002
\n– **\u8cc7\u6599\u6e05\u7406**: \u5728\u8655\u7406\u4e0d\u5b8c\u6574\u7684\u8cc7\u6599\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528 get() \u65b9\u6cd5\u70ba\u7f3a\u5931\u7684\u503c\u63d0\u4f9b\u9810\u8a2d\u503c\uff0c\u5f9e\u800c\u589e\u5f37\u8cc7\u6599\u7684\u5b8c\u6574\u6027\u3002<\/p>\n

\u900f\u904e\u4ee5\u4e0a\u7bc4\u4f8b\u8207\u5be6\u4f5c\uff0c\u4f60\u61c9\u80fd\u5920\u719f\u7df4\u904b\u7528 Python \u7684 get() \u65b9\u6cd5\u4f86\u63d0\u5347\u4f60\u7684\u7a0b\u5f0f\u78bc\u8cea\u91cf\u3002\u82e5\u60f3\u9032\u4e00\u6b65\u5b78\u7fd2 Python \u7684\u5176\u4ed6\u91cd\u8981\u529f\u80fd\uff0c\u6b61\u8fce\u53c3\u8003 [\u9019\u7bc7\u5b8c\u6574\u7684 Python \u6559\u5b78](https:\/\/vocus.cc\/article\/xyz)\uff0c\u52a9\u4f60\u5728 Python \u7de8\u7a0b\u7684\u9053\u8def\u4e0a\u8d8a\u8d70\u8d8a\u9060\u3002<\/p>\n

## Q&A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/p>\n

**Q1: \u4f7f\u7528 get() \u65b9\u6cd5\u6642\uff0c\u82e5\u4e0d\u6307\u5b9a default \u6703\u600e\u6a23\uff1f**
\n**A1:** \u82e5\u4e0d\u6307\u5b9a default\uff0c\u7576\u6307\u5b9a\u7684\u9375\u4e0d\u5b58\u5728\u6642\uff0cget() \u65b9\u6cd5\u6703\u56de\u50b3 None\u3002<\/p>\n

**Q2: get() \u65b9\u6cd5\u8207\u76f4\u63a5\u4f7f\u7528\u5b57\u5178\u7684\u7d22\u5f15\u6709\u4f55\u4e0d\u540c\uff1f**
\n**A2:** \u4f7f\u7528\u5b57\u5178\u7684\u7d22\u5f15\u82e5\u9375\u4e0d\u5b58\u5728\u6703\u5f15\u767c KeyError\uff0c\u800c get() \u65b9\u6cd5\u5247\u5b89\u5168\u5f97\u591a\uff0c\u4e0d\u6703\u5f15\u767c\u932f\u8aa4\u3002<\/p>\n

**Q3: \u53ef\u4ee5\u7528 get() \u65b9\u6cd5\u4f86\u6aa2\u67e5\u591a\u500b\u9375\u55ce\uff1f**
\n**A3:** get() \u65b9\u6cd5\u662f\u91dd\u5c0d\u55ae\u4e00\u9375\u8a2d\u8a08\u7684\u3002\u5982\u679c\u9700\u8981\u6aa2\u67e5\u591a\u500b\u9375\uff0c\u5efa\u8b70\u4f7f\u7528\u5faa\u74b0\u4f86\u9010\u4e00\u6aa2\u67e5\u3002<\/p>\n

—<\/p>\n","protected":false},"excerpt":{"rendered":"

\u4e86\u89e3Python\u4e2d\u7684get()\u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u8b93\u4f60\u5f9e\u5b57\u5178\u4e2d\u7372\u53d6\u7279\u5b9a\u7684\u503c\uff0c\u800c\u4e0d\u6703\u51fa\u73feKeyError\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u4ecb\u7d39get()\u65b9\u6cd5\u7684\u529f\u80fd\uff0c\u4ee5\u53ca\u5982\u4f55\u4f7f\u7528\u5b83\u4f86\u7372\u53d6\u5b57\u5178\u4e2d\u7684\u503c\u3002<\/p>\n","protected":false},"author":1,"featured_media":2518,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[18],"tags":[15],"class_list":["post-3442","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","tag-python"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/badgameshow.com\/steven\/wp-content\/uploads\/2022\/12\/DALL\u00b7E-2022-12-28-14.25.55-\u62f7\u8c9d2.png","jetpack-related-posts":[],"jetpack_shortlink":"https:\/\/wp.me\/pcFK27-Tw","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3442","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/comments?post=3442"}],"version-history":[{"count":2,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3442\/revisions"}],"predecessor-version":[{"id":12832,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3442\/revisions\/12832"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media\/2518"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=3442"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=3442"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=3442"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}