{"id":3054,"date":"2025-05-29T16:03:29","date_gmt":"2025-06-04T09:03:28","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=3054"},"modified":"2025-06-04T16:03:29","modified_gmt":"2025-06-04T09:03:28","slug":"%e4%ba%86%e8%a7%a3python%e7%9a%84iter%e5%87%bd%e6%95%b8-2","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/python\/%e4%ba%86%e8%a7%a3python%e7%9a%84iter%e5%87%bd%e6%95%b8-2\/","title":{"rendered":"\u6df1\u5165\u63a2\u8a0e Python \u7684 `iter()` \u51fd\u6578\uff1a2025 \u5e74\u6700\u65b0\u6559\u5b78\u8207\u6700\u4f73\u5be6\u8e10"},"content":{"rendered":"

<\/p>\n

\u6df1\u5165\u63a2\u8a0e Python \u7684 `iter()` \u51fd\u6578<\/h1>\n

\u5728 Python \u4e2d\uff0c`iter()` \u51fd\u6578\u662f\u4e00\u500b\u975e\u5e38\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5c07\u53ef\u8fed\u4ee3\u7684\u7269\u4ef6\u8f49\u63db\u6210\u8fed\u4ee3\u5668\uff0c\u5f9e\u800c\u5141\u8a31\u6211\u5011\u4ee5\u9ad8\u6548\u7684\u65b9\u5f0f\u4f86\u904d\u6b77\u6578\u64da\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u4ecb\u7d39 `iter()` \u51fd\u6578\u7684\u6700\u65b0\u7528\u6cd5\u3001\u5be6\u4f5c\u7bc4\u4f8b\u4ee5\u53ca\u5982\u4f55\u6709\u6548\u5730\u4f7f\u7528\u5b83\u4f86\u8655\u7406\u6578\u64da\u3002<\/p>\n

\u4ec0\u9ebc\u662f\u8fed\u4ee3\u5668\uff1f<\/h2>\n

\u8fed\u4ee3\u5668\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u7269\u4ef6\uff0c\u5b83\u53ef\u4ee5\u7528\u4f86\u5b58\u5132\u4e00\u7cfb\u5217\u7684\u503c\uff0c\u4e26\u4e14\u53ef\u4ee5\u901a\u904e\u8fed\u4ee3\u7684\u65b9\u5f0f\u4f86\u8a2a\u554f\u9019\u4e9b\u503c\u3002\u8fed\u4ee3\u5668\u5728 Python \u4e2d\u7684\u61c9\u7528\u975e\u5e38\u5ee3\u6cdb\uff0c\u5c24\u5176\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u56e0\u70ba\u5b83\u5011\u80fd\u5920\u6709\u6548\u5730\u7bc0\u7701\u5167\u5b58\u4e26\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n

`iter()` \u51fd\u6578\u7684\u7528\u6cd5<\/h2>\n

`iter()` \u51fd\u6578\u53ef\u4ee5\u63a5\u53d7\u4e00\u500b\u53ef\u8fed\u4ee3\u7684\u7269\u4ef6\uff0c\u4e26\u5c07\u5176\u8f49\u63db\u70ba\u4e00\u500b\u8fed\u4ee3\u5668\u3002\u5b83\u53ef\u4ee5\u63a5\u53d7\u4efb\u4f55\u53ef\u8fed\u4ee3\u7684\u7269\u4ef6\uff0c\u5305\u62ec\u5217\u8868\u3001\u5b57\u5178\u3001\u5b57\u7b26\u4e32\u7b49\u3002\u4ee5\u4e0b\u662f `iter()` \u51fd\u6578\u7684\u57fa\u672c\u7528\u6cd5\u793a\u4f8b\uff1a<\/p>\n

“`python
\nnumbers = [1, 2, 3, 4, 5]\nnumbers_iterator = iter(numbers) # \u5c07\u5217\u8868\u8f49\u63db\u70ba\u8fed\u4ee3\u5668
\n“`<\/p>\n

\u73fe\u5728\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 `next()` \u51fd\u6578\u4f86\u8a2a\u554f\u8fed\u4ee3\u5668\u4e2d\u7684\u503c\uff1a<\/p>\n

“`python
\nprint(next(numbers_iterator)) # \u8f38\u51fa: 1
\nprint(next(numbers_iterator)) # \u8f38\u51fa: 2
\nprint(next(numbers_iterator)) # \u8f38\u51fa: 3
\n“`<\/p>\n

\u70ba\u4ec0\u9ebc\u8981\u4f7f\u7528 `iter()` \u51fd\u6578\uff1f<\/h2>\n

\u4f7f\u7528 `iter()` \u51fd\u6578\u6709\u591a\u500b\u597d\u8655\uff1a<\/p>\n

1. **\u91cd\u8907\u4f7f\u7528\u7269\u4ef6**\uff1a\u53ef\u4ee5\u5728\u4e0d\u91cd\u65b0\u5275\u5efa\u7269\u4ef6\u7684\u60c5\u6cc1\u4e0b\u91cd\u8907\u4f7f\u7528\u6578\u64da\uff0c\u9019\u5c0d\u65bc\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u7279\u5225\u6709\u7528\u3002
\n2. **\u5167\u5b58\u6548\u7387**\uff1a\u8fed\u4ee3\u5668\u53ea\u5728\u9700\u8981\u6642\u751f\u6210\u6578\u64da\uff0c\u9019\u6a23\u53ef\u4ee5\u7bc0\u7701\u5167\u5b58\u3002
\n3. **\u7c21\u5316\u4ee3\u78bc**\uff1a\u4f7f\u4ee3\u78bc\u66f4\u7c21\u6f54\u660e\u77ad\uff0c\u6613\u65bc\u7dad\u8b77\u3002<\/p>\n

\u5e38\u898b\u932f\u8aa4\u53ca\u6392\u9664\u65b9\u6cd5<\/h2>\n

\u5728\u4f7f\u7528 `iter()` \u51fd\u6578\u6642\uff0c\u53ef\u80fd\u6703\u9047\u5230\u4ee5\u4e0b\u5e38\u898b\u932f\u8aa4\uff1a<\/p>\n

1. **StopIteration \u932f\u8aa4**\uff1a\u7576 `next()` \u88ab\u8abf\u7528\u6642\uff0c\u82e5\u6c92\u6709\u66f4\u591a\u7684\u5143\u7d20\u53ef\u4f9b\u8fd4\u56de\uff0c\u5c07\u5f15\u767c `StopIteration` \u932f\u8aa4\u3002\u53ef\u4ee5\u4f7f\u7528 `try…except` \u584a\u4f86\u6355\u6349\u6b64\u932f\u8aa4\u3002<\/p>\n

“`python
\n try:
\n print(next(numbers_iterator))
\n except StopIteration:
\n print(“\u5df2\u7d93\u5230\u9054\u8fed\u4ee3\u5668\u7684\u672b\u5c3e\u3002”)
\n “`<\/p>\n

2. **\u975e\u53ef\u8fed\u4ee3\u7269\u4ef6**\uff1a\u78ba\u4fdd\u50b3\u5165 `iter()` \u7684\u7269\u4ef6\u662f\u53ef\u8fed\u4ee3\u7684\uff0c\u5982\u5217\u8868\u3001\u5b57\u5178\u3001\u5143\u7d44\u7b49\uff0c\u5426\u5247\u5c07\u5f15\u767c `TypeError`\u3002<\/p>\n

\u5ef6\u4f38\u61c9\u7528<\/h2>\n

\u9664\u4e86\u57fa\u672c\u7684\u7528\u6cd5\u5916\uff0c`iter()` \u51fd\u6578\u9084\u53ef\u4ee5\u8207\u5176\u4ed6 Python \u529f\u80fd\u7d50\u5408\u4f7f\u7528\uff0c\u4f8b\u5982\uff1a<\/p>\n

– **\u5217\u8868\u63a8\u5c0e\u5f0f**\uff1a\u53ef\u4ee5\u8207 `iter()` \u7d50\u5408\u4f7f\u7528\u4f86\u751f\u6210\u65b0\u7684\u5217\u8868\u3002<\/p>\n

“`python
\n squares = [x**2 for x in iter(range(10))]\n print(squares) # \u8f38\u51fa: [0, 1, 4, 9, 16, 25, 36, 49, 64, 81]\n “`<\/p>\n

– **\u81ea\u5b9a\u7fa9\u8fed\u4ee3\u5668**\uff1a\u53ef\u4ee5\u81ea\u5b9a\u7fa9\u4e00\u500b\u985e\u4f86\u5be6\u73fe\u8fed\u4ee3\u5668\uff0c\u4e26\u4f7f\u7528 `iter()` \u4f86\u9032\u884c\u8fed\u4ee3\u3002<\/p>\n

“`python
\n class Countdown:
\n def __init__(self, start):
\n self.start = start<\/p>\n

def __iter__(self):
\n self.current = self.start
\n return self<\/p>\n

def __next__(self):
\n if self.current < 0:\n raise StopIteration\n else:\n self.current -= 1\n return self.current + 1\n\n countdown = Countdown(5)\n for number in countdown:\n print(number) # \u8f38\u51fa: 5, 4, 3, 2, 1\n ```\n\n\n\n

\u7e3d\u7d50<\/h2>\n

Python \u4e2d\u7684 `iter()` \u51fd\u6578\u662f\u8655\u7406\u53ef\u8fed\u4ee3\u7269\u4ef6\u7684\u5f37\u5927\u5de5\u5177\uff0c\u8b93\u6211\u5011\u80fd\u5920\u66f4\u6709\u6548\u5730\u64cd\u4f5c\u6578\u64da\u3002\u901a\u904e\u672c\u6587\u7684\u4ecb\u7d39\uff0c\u60a8\u61c9\u8a72\u80fd\u5920\u7406\u89e3 `iter()` \u7684\u57fa\u672c\u7528\u6cd5\u53ca\u5176\u80cc\u5f8c\u7684\u6700\u4f73\u5be6\u8e10\u3002\u82e5\u60f3\u9032\u4e00\u6b65\u4e86\u89e3 Python \u7684\u5176\u4ed6\u7279\u6027\uff0c\u5efa\u8b70\u53c3\u8003 [Python \u6559\u5b78\u8cc7\u6e90](https:\/\/vocus.cc\/article\/123456) \u4ee5\u7372\u53d6\u66f4\u591a\u8a73\u7d30\u4fe1\u606f\u3002<\/p>\n

Q&A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/h2>\n

**Q1: `iter()` \u51fd\u6578\u7684\u8fd4\u56de\u503c\u662f\u4ec0\u9ebc\uff1f**
\nA1: `iter()` \u51fd\u6578\u8fd4\u56de\u4e00\u500b\u8fed\u4ee3\u5668\u7269\u4ef6\uff0c\u53ef\u4ee5\u7528\u65bc\u904d\u6b77\u53ef\u8fed\u4ee3\u7269\u4ef6\u7684\u5143\u7d20\u3002<\/p>\n

**Q2: \u5982\u4f55\u77e5\u9053\u8fed\u4ee3\u5668\u662f\u5426\u9084\u6709\u5143\u7d20\uff1f**
\nA2: \u4f7f\u7528 `next()` \u51fd\u6578\u53ef\u4ee5\u7372\u53d6\u4e0b\u4e00\u500b\u5143\u7d20\uff0c\u4f46\u5728\u6c92\u6709\u5143\u7d20\u6642\u6703\u5f15\u767c `StopIteration` \u932f\u8aa4\u3002\u53ef\u4ee5\u4f7f\u7528 `try…except` \u584a\u4f86\u8655\u7406\u9019\u7a2e\u60c5\u6cc1\u3002<\/p>\n

**Q3: `iter()` \u8207 `for` \u5faa\u74b0\u6709\u4ec0\u9ebc\u95dc\u4fc2\uff1f**
\nA3: `for` \u5faa\u74b0\u6703\u81ea\u52d5\u8abf\u7528 `iter()` \u51fd\u6578\u4f86\u7372\u53d6\u8fed\u4ee3\u5668\uff0c\u7136\u5f8c\u4f7f\u7528 `next()` \u4f86\u904d\u6b77\u6bcf\u4e00\u500b\u5143\u7d20\uff0c\u76f4\u5230\u6240\u6709\u5143\u7d20\u90fd\u88ab\u904d\u6b77\u5b8c\u7562\u3002<\/p>\n

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

\u4e86\u89e3Python\u7684iter()\u51fd\u6578\uff0c\u5b83\u53ef\u4ee5\u8b93\u4f60\u5c07\u53ef\u8fed\u4ee3\u7684\u5c0d\u8c61\u8f49\u63db\u70ba\u8fed\u4ee3\u5668\uff0c\u4ee5\u4fbf\u53ef\u4ee5\u4f7f\u7528next()\u51fd\u6578\u4f86\u7372\u53d6\u5176\u4e2d\u7684\u5143\u7d20\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39iter()\u51fd\u6578\u7684\u7528\u6cd5\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u793a\u4f8b\u4f86\u89e3\u91cb\u5b83\u7684\u529f\u80fd\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-3054","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-Ng","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3054","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=3054"}],"version-history":[{"count":2,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3054\/revisions"}],"predecessor-version":[{"id":12947,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3054\/revisions\/12947"}],"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=3054"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=3054"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=3054"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}