<\/p>\n
\u5728 Python \u4e2d\uff0c`__setitem__()` \u51fd\u6578\u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u7279\u6027\uff0c\u5141\u8a31\u6211\u5011\u5c0d\u5b57\u5178\u6216\u5176\u4ed6\u53ef\u8b8a\u5bb9\u5668\u9032\u884c\u8ce6\u503c\u64cd\u4f5c\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u4ecb\u7d39 `__setitem__()` \u7684\u7528\u6cd5\u3001\u793a\u4f8b\u53ca\u6700\u4f73\u5be6\u8e10\uff0c\u5e6b\u52a9\u4f60\u66f4\u6709\u6548\u5730\u4f7f\u7528 Python\u3002<\/p>\n
## \u4ec0\u9ebc\u662f `__setitem__()`\uff1f<\/p>\n
`__setitem__()` \u662f Python \u4e2d\u4e00\u500b\u7279\u6b8a\u7684\u65b9\u6cd5\uff0c\u901a\u5e38\u7528\u65bc\u81ea\u5b9a\u7fa9\u985e\u5225\uff0c\u4f7f\u5f97\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u65b9\u62ec\u865f\u8a9e\u6cd5\uff08\u4f8b\u5982 `obj[key] = value`\uff09\u4f86\u8a2d\u7f6e\u5c0d\u8c61\u7684\u5c6c\u6027\u3002\u5c0d\u65bc\u5167\u5efa\u7684\u5b57\u5178\u985e\u578b\uff0c\u9019\u500b\u65b9\u6cd5\u4f7f\u5f97\u6211\u5011\u80fd\u5920\u76f4\u63a5\u4fee\u6539\u5b57\u5178\u4e2d\u7684\u9375\u503c\u5c0d\u3002<\/p>\n
## \u57fa\u672c\u7528\u6cd5<\/p>\n
\u8b93\u6211\u5011\u901a\u904e\u4e00\u500b\u4f8b\u5b50\u4f86\u8aaa\u660e\u5982\u4f55\u4f7f\u7528 `__setitem__()`\u3002\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u5b57\u5178\uff0c\u88e1\u9762\u6709\u4e00\u500b\u9375\u503c\u5c0d\uff0c\u9375\u662f “name”\uff0c\u503c\u662f “John”\uff1a<\/p>\n
“`python
\nmy_dict = {
\n “name”: “John”
\n}
\n“`<\/p>\n
\u5982\u679c\u6211\u5011\u60f3\u8981\u628a “name” \u7684\u503c\u6539\u6210 “Bob”\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u65b9\u5f0f\uff1a<\/p>\n
“`python
\nmy_dict[“name”] = “Bob”
\n“`<\/p>\n
\u57f7\u884c\u5f8c\uff0c\u6211\u5011\u53ef\u4ee5\u770b\u5230\u5b57\u5178\u4e2d\u7684\u503c\u5df2\u7d93\u66f4\u65b0\uff1a<\/p>\n
“`python
\nprint(my_dict)
\n# {‘name’: ‘Bob’}
\n“`<\/p>\n
## \u4f7f\u7528 `__setitem__()` \u7684\u5176\u4ed6\u5bb9\u5668<\/p>\n
\u9664\u4e86\u5b57\u5178\uff0c`__setitem__()` \u4e5f\u53ef\u4ee5\u88ab\u7528\u65bc\u5176\u4ed6\u53ef\u8b8a\u5bb9\u5668\uff0c\u4f8b\u5982\u5217\u8868\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n
“`python
\nmy_list = [1, 2, 3]\nmy_list[1] = 4<\/p>\n
print(my_list)
\n# [1, 4, 3]\n“`<\/p>\n
## \u932f\u8aa4\u6392\u9664<\/p>\n
\u5728\u4f7f\u7528 `__setitem__()` \u6642\uff0c\u5e38\u898b\u7684\u932f\u8aa4\u5305\u62ec\uff1a
\n– **KeyError**\uff1a\u7576\u4f60\u5617\u8a66\u8a2a\u554f\u4e00\u500b\u4e0d\u5b58\u5728\u7684\u9375\u6642\uff0c\u6703\u62cb\u51fa\u6b64\u932f\u8aa4\u3002\u78ba\u4fdd\u4f60\u5728\u4f7f\u7528\u5b57\u5178\u6642\u6aa2\u67e5\u9375\u662f\u5426\u5b58\u5728\u3002
\n– **IndexError**\uff1a\u7576\u4f60\u5617\u8a66\u8a2a\u554f\u5217\u8868\u4e2d\u4e0d\u5b58\u5728\u7684\u7d22\u5f15\u6642\uff0c\u6703\u62cb\u51fa\u6b64\u932f\u8aa4\u3002\u78ba\u4fdd\u7d22\u5f15\u5728\u6709\u6548\u7bc4\u570d\u5167\u3002<\/p>\n
## \u5ef6\u4f38\u61c9\u7528<\/p>\n
\u4f60\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u548c `__setitem__()` \u4f86\u5efa\u7acb\u66f4\u5fa9\u96dc\u7684\u6578\u64da\u7d50\u69cb\uff0c\u4f8b\u5982\u5d4c\u5957\u5b57\u5178\uff0c\u9019\u5728\u8655\u7406 JSON \u6578\u64da\u6642\u975e\u5e38\u6709\u7528\u3002<\/p>\n
“`python
\ndata = {}
\ndata[“user”] = {}
\ndata[“user”][“name”] = “Alice”
\ndata[“user”][“age”] = 30<\/p>\n
print(data)
\n# {‘user’: {‘name’: ‘Alice’, ‘age’: 30}}
\n“`<\/p>\n
## \u7d50\u8ad6<\/p>\n
\u7e3d\u7d50\u4f86\u8aaa\uff0cPython \u4e2d\u7684 `__setitem__()` \u51fd\u6578\u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u8b93\u6211\u5011\u80fd\u5920\u8f15\u9b06\u5730\u5c0d\u5b57\u5178\u548c\u5176\u4ed6\u53ef\u8b8a\u5bb9\u5668\u9032\u884c\u8ce6\u503c\u64cd\u4f5c\u3002\u719f\u6089\u9019\u500b\u51fd\u6578\u7684\u4f7f\u7528\uff0c\u53ef\u4ee5\u8b93\u4f60\u5728 Python \u958b\u767c\u4e2d\u66f4\u52a0\u5f97\u5fc3\u61c9\u624b\u3002<\/p>\n
\u5982\u9700\u66f4\u6df1\u5165\u7684 Python \u6559\u5b78\uff0c\u6b61\u8fce\u53c3\u8003 [vocus.cc \u7684 Python \u6559\u5b78](https:\/\/vocus.cc) \u6216 [miner.tw \u7684\u9032\u968e\u8ab2\u7a0b](https:\/\/miner.tw)\u3002<\/p>\n
## Q&A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/p>\n
**Q1: `__setitem__()` \u548c `setitem()` \u6709\u4ec0\u9ebc\u5340\u5225\uff1f**
\nA1: `setitem()` \u4e0d\u662f Python \u7684\u5167\u5efa\u51fd\u6578\uff0c\u800c\u662f\u7528\u4f86\u63cf\u8ff0 `__setitem__()` \u7684\u65b9\u6cd5\u540d\u3002\u4f7f\u7528\u65b9\u62ec\u865f\u8a9e\u6cd5\u6642\uff0c\u5be6\u969b\u4e0a\u662f\u8abf\u7528 `__setitem__()` \u65b9\u6cd5\u3002<\/p>\n
**Q2: \u5982\u4f55\u8655\u7406\u5b57\u5178\u4e2d\u4e0d\u5b58\u5728\u7684\u9375\uff1f**
\nA2: \u4f60\u53ef\u4ee5\u4f7f\u7528 `dict.get(key, default)` \u65b9\u6cd5\u4f86\u5b89\u5168\u5730\u7372\u53d6\u9375\u7684\u503c\uff0c\u4e26\u63d0\u4f9b\u4e00\u500b\u9ed8\u8a8d\u503c\u4ee5\u907f\u514d `KeyError`\u3002<\/p>\n
**Q3: \u5217\u8868\u548c\u5b57\u5178\u4f7f\u7528 `__setitem__()` \u6709\u4ec0\u9ebc\u4e0d\u540c\uff1f**
\nA3: \u5728\u5b57\u5178\u4e2d\uff0c`__setitem__()` \u7528\u65bc\u8a2d\u7f6e\u9375\u503c\u5c0d\uff0c\u800c\u5728\u5217\u8868\u4e2d\uff0c\u5b83\u5247\u7528\u65bc\u8a2d\u7f6e\u5143\u7d20\u7684\u7d22\u5f15\u503c\u3002\u5169\u8005\u7684\u7528\u6cd5\u985e\u4f3c\uff0c\u4f46\u9069\u7528\u7684\u5bb9\u5668\u985e\u578b\u4e0d\u540c\u3002
\n—<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3Python\u4e2d\u7684setitem()\u51fd\u6578\uff0c\u5b83\u53ef\u4ee5\u8b93\u4f60\u5c0d\u5b57\u5178\u4e2d\u7684\u9375\u503c\u5c0d\u9032\u884c\u8a2d\u7f6e\uff0c\u4ee5\u66f4\u65b0\u5b57\u5178\u4e2d\u7684\u503c\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39setitem()\u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u4ee5\u53ca\u5b83\u7684\u512a\u9ede\u548c\u7f3a\u9ede\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-3068","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-Nu","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3068","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=3068"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3068\/revisions"}],"predecessor-version":[{"id":3069,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3068\/revisions\/3069"}],"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=3068"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=3068"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=3068"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}