<\/p>\n
Python \u7684 `deque()` \u662f\u4e00\u500b\u4f86\u81ea `collections` \u6a21\u7d44\u7684\u96d9\u5411\u5217\u8868\uff0c\u80fd\u5920\u5728\u5217\u8868\u7684\u5169\u7aef\u5feb\u901f\u6dfb\u52a0\u548c\u522a\u9664\u5143\u7d20\uff0c\u800c\u4e0d\u9700\u6539\u8b8a\u539f\u6709\u7684\u5217\u8868\u7d50\u69cb\u3002\u9019\u4f7f\u5f97 `deque` \u6210\u70ba\u8655\u7406\u968a\u5217\u548c\u5806\u758a\u7684\u7406\u60f3\u9078\u64c7\u3002<\/p>\n
### \u70ba\u4ec0\u9ebc\u4f7f\u7528 deque()\uff1f<\/p>\n
`deque` \u7684\u8a2d\u8a08\u76ee\u7684\u662f\u70ba\u4e86\u63d0\u4f9b\u6bd4 Python \u539f\u751f\u5217\u8868\u66f4\u6709\u6548\u7684\u63d2\u5165\u548c\u522a\u9664\u64cd\u4f5c\u3002\u5b83\u7684\u6642\u9593\u8907\u96dc\u5ea6\u662f O(1)\uff0c\u800c\u5217\u8868\u5728\u982d\u90e8\u9032\u884c\u64cd\u4f5c\u6642\u7684\u6642\u9593\u8907\u96dc\u5ea6\u70ba O(n)\u3002\u9019\u4f7f\u5f97 `deque` \u5728\u9700\u8981\u983b\u7e41\u9032\u884c\u63d2\u5165\u548c\u522a\u9664\u7684\u5834\u666f\u4e2d\u8868\u73fe\u66f4\u4f73\u3002<\/p>\n
### \u57fa\u672c\u7528\u6cd5<\/p>\n
\u8981\u4f7f\u7528 `deque()`\uff0c\u9996\u5148\u9700\u8981\u5c0e\u5165\u5b83\uff1a<\/p>\n
“`python
\nfrom collections import deque<\/p>\n
# \u5efa\u7acb\u4e00\u500b\u7a7a\u7684 deque
\nmy_deque = deque()<\/p>\n
# \u5728 deque \u7684\u6700\u5f8c\u9762\u6dfb\u52a0\u4e00\u500b\u5143\u7d20
\nmy_deque.append(‘a’)<\/p>\n
# \u5728 deque \u7684\u6700\u524d\u9762\u6dfb\u52a0\u4e00\u500b\u5143\u7d20
\nmy_deque.appendleft(‘b’)<\/p>\n
# \u5728 deque \u7684\u6700\u5f8c\u9762\u522a\u9664\u4e00\u500b\u5143\u7d20
\nmy_deque.pop()<\/p>\n
# \u5728 deque \u7684\u6700\u524d\u9762\u522a\u9664\u4e00\u500b\u5143\u7d20
\nmy_deque.popleft()
\n“`<\/p>\n
### \u9032\u968e\u64cd\u4f5c<\/p>\n
\u9664\u4e86\u57fa\u672c\u7684\u6dfb\u52a0\u548c\u522a\u9664\u64cd\u4f5c\uff0c`deque` \u9084\u652f\u63f4\u4e00\u4e9b\u9032\u968e\u529f\u80fd\uff0c\u4f8b\u5982\uff1a<\/p>\n
#### 1. \u65cb\u8f49\u64cd\u4f5c<\/p>\n
\u4f60\u53ef\u4ee5\u4f7f\u7528 `rotate()` \u65b9\u6cd5\u4f86\u65cb\u8f49 `deque` \u4e2d\u7684\u5143\u7d20\uff1a<\/p>\n
“`python
\n# \u65cb\u8f49 deque \u4e2d\u7684\u5143\u7d20\uff0c\u6b63\u6578\u70ba\u5411\u53f3\u65cb\u8f49\uff0c\u8ca0\u6578\u70ba\u5411\u5de6\u65cb\u8f49
\nmy_deque.rotate(1) # \u5411\u53f3\u65cb\u8f491\u500b\u4f4d\u7f6e
\n“`<\/p>\n
#### 2. \u9650\u5236\u5927\u5c0f<\/p>\n
\u4f60\u53ef\u4ee5\u5728\u5275\u5efa `deque` \u6642\u6307\u5b9a\u6700\u5927\u5927\u5c0f\uff0c\u9019\u6a23\u7576\u8d85\u904e\u6b64\u5927\u5c0f\u6642\uff0c\u6700\u820a\u7684\u5143\u7d20\u6703\u88ab\u81ea\u52d5\u522a\u9664\uff1a<\/p>\n
“`python
\n# \u5275\u5efa\u4e00\u500b\u6700\u5927\u5927\u5c0f\u70ba 3 \u7684 deque
\nbounded_deque = deque(maxlen=3)
\nbounded_deque.extend([‘x’, ‘y’, ‘z’])
\nbounded_deque.append(‘a’) # ‘x’ \u6703\u88ab\u522a\u9664
\n“`<\/p>\n
### \u932f\u8aa4\u6392\u9664<\/p>\n
1. **AttributeError**: \u5982\u679c\u4f60\u5617\u8a66\u5728 `deque` \u4e0a\u4f7f\u7528\u5217\u8868\u65b9\u6cd5\uff0c\u4f8b\u5982 `sort()`\uff0c\u6703\u5c0e\u81f4\u932f\u8aa4\u3002\u56e0\u70ba `deque` \u4e0d\u652f\u63f4\u9019\u4e9b\u65b9\u6cd5\uff0c\u61c9\u4f7f\u7528 `sorted()` \u51fd\u6578\u4f86\u6392\u5e8f\u3002<\/p>\n
“`python
\n# \u4f7f\u7528 sorted() \u4f86\u6392\u5e8f deque \u4e2d\u7684\u5143\u7d20
\nsorted_deque = deque(sorted(my_deque))
\n“`<\/p>\n
2. **IndexError**: \u7576\u4f60\u5617\u8a66\u5f9e\u7a7a\u7684 `deque` \u4e2d\u522a\u9664\u5143\u7d20\u6642\uff0c\u6703\u5f15\u767c\u9019\u500b\u932f\u8aa4\u3002\u78ba\u4fdd\u5728\u522a\u9664\u4e4b\u524d\u6aa2\u67e5 `deque` \u662f\u5426\u70ba\u7a7a\u3002<\/p>\n
### \u5ef6\u4f38\u61c9\u7528<\/p>\n
`deque` \u5728\u8a31\u591a\u5be6\u969b\u61c9\u7528\u4e2d\u90fd\u975e\u5e38\u6709\u7528\uff0c\u4f8b\u5982\uff1a<\/p>\n
– **\u4efb\u52d9\u6392\u7a0b**\uff1a\u7528\u65bc\u5be6\u73fe\u4efb\u52d9\u968a\u5217\uff0c\u96a8\u8457\u4efb\u52d9\u7684\u5b8c\u6210\u6dfb\u52a0\u65b0\u7684\u4efb\u52d9\u3002
\n– **\u7de9\u5b58\u6a5f\u5236**\uff1a\u9650\u5927\u5c0f\u7684 `deque` \u53ef\u4ee5\u7528\u4f86\u5be6\u73fe LRU\uff08\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\uff09\u7de9\u5b58\u3002
\n– **\u6578\u64da\u6d41\u8655\u7406**\uff1a\u5728\u6578\u64da\u6d41\u7684\u60c5\u5883\u4e2d\uff0c`deque` \u53ef\u4ee5\u7528\u4f86\u9ad8\u6548\u5730\u8655\u7406\u5373\u6642\u6578\u64da\u3002<\/p>\n
\u82e5\u60f3\u9032\u4e00\u6b65\u4e86\u89e3 Python \u7684\u8cc7\u6599\u7d50\u69cb\uff0c\u5efa\u8b70\u53c3\u8003 [\u9019\u7bc7\u6587\u7ae0](https:\/\/vocus.cc) \u7372\u53d6\u66f4\u591a\u6559\u5b78\u8cc7\u8a0a\u3002<\/p>\n
### \u7d50\u8ad6<\/p>\n
`deque` \u662f Python \u4e2d\u4e00\u500b\u5f37\u5927\u7684\u8cc7\u6599\u7d50\u69cb\uff0c\u900f\u904e\u5176\u9ad8\u6548\u7684\u6dfb\u52a0\u548c\u522a\u9664\u64cd\u4f5c\uff0c\u53ef\u4ee5\u5e6b\u52a9\u4f60\u66f4\u597d\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u8cc7\u6599\u3002\u5982\u679c\u4f60\u60f3\u5728\u4f60\u7684\u7a0b\u5f0f\u78bc\u4e2d\u4f7f\u7528 `deque()`\uff0c\u53ea\u9700\u5c0e\u5165 `collections` \u6a21\u7d44\u4e26\u958b\u59cb\u4f7f\u7528\u3002<\/p>\n
### \u5e38\u898b\u554f\u984c\u89e3\u7b54\uff08Q&A\uff09<\/p>\n
**1. deque \u548c list \u6709\u4ec0\u9ebc\u5340\u5225\uff1f**
\n – `deque` \u63d0\u4f9b O(1) \u7684\u6dfb\u52a0\u548c\u522a\u9664\u64cd\u4f5c\uff0c\u800c `list` \u5728\u982d\u90e8\u64cd\u4f5c\u6642\u662f O(n)\u3002\u56e0\u6b64\uff0c`deque` \u66f4\u9069\u5408\u983b\u7e41\u7684\u968a\u5217\u548c\u5806\u758a\u64cd\u4f5c\u3002<\/p>\n
**2. \u5982\u4f55\u5728 deque \u4e2d\u9032\u884c\u5143\u7d20\u641c\u5c0b\uff1f**
\n – \u4f60\u53ef\u4ee5\u4f7f\u7528 `index()` \u65b9\u6cd5\u4f86\u641c\u5c0b\u5143\u7d20\u7684\u4f4d\u7f6e\uff0c\u4f46\u6ce8\u610f\u5982\u679c\u5143\u7d20\u4e0d\u5b58\u5728\uff0c\u6703\u5f15\u767c `ValueError`\u3002<\/p>\n
**3. deque \u662f\u5426\u652f\u63f4\u5207\u7247\u64cd\u4f5c\uff1f**
\n – `deque` \u4e0d\u652f\u63f4\u5207\u7247\u64cd\u4f5c\u3002\u5982\u679c\u9700\u8981\u5f9e\u4e2d\u7372\u53d6\u5b50\u5e8f\u5217\uff0c\u53ef\u4ee5\u8003\u616e\u5c07\u5176\u8f49\u63db\u70ba\u5217\u8868\u3002<\/p>\n
—<\/p>\n
\u4ee5\u4e0a\u5167\u5bb9\u5df2\u6839\u64da\u8981\u6c42\u9032\u884c\u4e86\u5b8c\u6574\u512a\u5316\uff0c\u4e26\u5f37\u5316\u4e86 SEO\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
deque()\u662fPython\u4e2d\u7684\u4e00\u500b\u53ef\u6015\u53c8\u6709\u8da3\u7684\u6a21\u7d44\uff0c\u5b83\u53ef\u4ee5\u8b93\u4f60\u5feb\u901f\u5730\u64cd\u4f5c\u53ca\u7ba1\u7406\u4f60\u7684\u8cc7\u6599\uff0c\u4e26\u4e14\u63d0\u4f9b\u4e86\u8a31\u591a\u6709\u7528\u7684\u529f\u80fd\uff0c\u8b93\u4f60\u53ef\u4ee5\u66f4\u6709\u6548\u7387\u5730\u8655\u7406\u8cc7\u6599\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-3222","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-PY","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3222","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=3222"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3222\/revisions"}],"predecessor-version":[{"id":3223,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3222\/revisions\/3223"}],"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=3222"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=3222"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=3222"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}