{"id":2754,"date":"2025-03-14T22:42:42","date_gmt":"2025-03-14T14:42:42","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2754"},"modified":"2025-03-14T22:42:42","modified_gmt":"2025-03-14T14:42:42","slug":"python3-%e6%8e%a8%e5%af%bc%e5%bc%8f%ef%bc%88comprehensions%ef%bc%89%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/14\/python3-%e6%8e%a8%e5%af%bc%e5%bc%8f%ef%bc%88comprehensions%ef%bc%89%e8%af%a6%e8%a7%a3\/","title":{"rendered":"Python3 \u63a8\u5bfc\u5f0f\uff08Comprehensions\uff09\u8be6\u89e3"},"content":{"rendered":"\n

Python \u63a8\u5bfc\u5f0f\u662f\u4e00\u79cd\u7b80\u6d01\u4e14\u5f3a\u5927\u7684\u8bed\u6cd5\uff0c\u7528\u4e8e\u5feb\u901f\u521b\u5efa \u5217\u8868\uff08List\uff09\u3001\u5b57\u5178\uff08Dictionary\uff09\u3001\u96c6\u5408\uff08Set\uff09<\/strong> \u7b49\u6570\u636e\u7ed3\u6784\u3002\u4f7f\u7528\u63a8\u5bfc\u5f0f\u53ef\u4ee5\u51cf\u5c11\u4ee3\u7801\u91cf\uff0c\u63d0\u9ad8\u53ef\u8bfb\u6027\uff0c\u4f7f\u4ee3\u7801\u66f4\u52a0 Pythonic\u3002<\/p>\n\n\n\n

\n\n\n\n

1. Python \u63a8\u5bfc\u5f0f\u7684\u79cd\u7c7b<\/strong><\/h2>\n\n\n\n

Python \u63d0\u4f9b\u4e86\u4ee5\u4e0b\u51e0\u79cd\u63a8\u5bfc\u5f0f\uff1a<\/p>\n\n\n\n

    \n
  1. \u5217\u8868\u63a8\u5bfc\u5f0f\uff08List Comprehension\uff09<\/strong><\/li>\n\n\n\n
  2. \u5b57\u5178\u63a8\u5bfc\u5f0f\uff08Dictionary Comprehension\uff09<\/strong><\/li>\n\n\n\n
  3. \u96c6\u5408\u63a8\u5bfc\u5f0f\uff08Set Comprehension\uff09<\/strong><\/li>\n\n\n\n
  4. \u751f\u6210\u5668\u63a8\u5bfc\u5f0f\uff08Generator Comprehension\uff09<\/strong><\/li>\n<\/ol>\n\n\n\n
    \n\n\n\n

    2. \u5217\u8868\u63a8\u5bfc\u5f0f\uff08List Comprehension\uff09<\/strong><\/h2>\n\n\n\n

    \u57fa\u672c\u8bed\u6cd5<\/strong><\/h3>\n\n\n\n
    [\u8868\u8fbe\u5f0f for \u53d8\u91cf in \u53ef\u8fed\u4ee3\u5bf9\u8c61 if \u6761\u4ef6]<\/code><\/pre>\n\n\n\n
    \ud83d\udd39 \u793a\u4f8b 1\uff1a\u751f\u6210\u4e00\u4e2a\u5e73\u65b9\u5217\u8868<\/strong><\/p>\n\n\n\n
    squares = [x ** 2 for x in range(1, 6)]\nprint(squares)  # [1, 4, 9, 16, 25]<\/code><\/pre>\n\n\n\n
    \ud83d\udd39 \u793a\u4f8b 2\uff1a\u7b5b\u9009\u5076\u6570<\/strong><\/p>\n\n\n\n
    even_numbers = [x for x in range(10) if x % 2 == 0]\nprint(even_numbers)  # [0, 2, 4, 6, 8]<\/code><\/pre>\n\n\n\n
    \ud83d\udd39 \u793a\u4f8b 3\uff1a\u591a\u91cd\u5faa\u73af<\/strong><\/p>\n\n\n\n
    pairs = [(x, y) for x in range(3) for y in range(2)]\nprint(pairs)  # [(0, 0), (0, 1), (1, 0), (1, 1), (2, 0), (2, 1)]<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    3. \u5b57\u5178\u63a8\u5bfc\u5f0f\uff08Dictionary Comprehension\uff09<\/strong><\/h2>\n\n\n\n
    \u57fa\u672c\u8bed\u6cd5<\/strong><\/h3>\n\n\n\n
    {\u952e\u8868\u8fbe\u5f0f: \u503c\u8868\u8fbe\u5f0f for \u53d8\u91cf in \u53ef\u8fed\u4ee3\u5bf9\u8c61 if \u6761\u4ef6}<\/code><\/pre>\n\n\n\n
    \ud83d\udd39 \u793a\u4f8b 1\uff1a\u521b\u5efa\u5e73\u65b9\u5b57\u5178<\/strong><\/p>\n\n\n\n
    squares_dict = {x: x ** 2 for x in range(1, 6)}\nprint(squares_dict)  # {1: 1, 2: 4, 3: 9, 4: 16, 5: 25}<\/code><\/pre>\n\n\n\n
    \ud83d\udd39 \u793a\u4f8b 2\uff1a\u4ea4\u6362\u5b57\u5178\u7684\u952e\u548c\u503c<\/strong><\/p>\n\n\n\n
    original_dict = {'a': 1, 'b': 2, 'c': 3}\ninverted_dict = {v: k for k, v in original_dict.items()}\nprint(inverted_dict)  # {1: 'a', 2: 'b', 3: 'c'}<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    4. \u96c6\u5408\u63a8\u5bfc\u5f0f\uff08Set Comprehension\uff09<\/strong><\/h2>\n\n\n\n
    \u57fa\u672c\u8bed\u6cd5<\/strong><\/h3>\n\n\n\n
    {\u8868\u8fbe\u5f0f for \u53d8\u91cf in \u53ef\u8fed\u4ee3\u5bf9\u8c61 if \u6761\u4ef6}<\/code><\/pre>\n\n\n\n
    \ud83d\udd39 \u793a\u4f8b 1\uff1a\u521b\u5efa\u5e73\u65b9\u96c6\u5408<\/strong><\/p>\n\n\n\n
    squares_set = {x ** 2 for x in range(1, 6)}\nprint(squares_set)  # {1, 4, 9, 16, 25}<\/code><\/pre>\n\n\n\n
    \ud83d\udd39 \u793a\u4f8b 2\uff1a\u53bb\u91cd<\/strong><\/p>\n\n\n\n
    unique_chars = {char for char in \"hello world\"}\nprint(unique_chars)  # {'w', 'r', 'e', 'o', 'h', 'd', 'l'}<\/code><\/pre>\n\n\n\n
    \n\n\n\n
    5. \u751f\u6210\u5668\u63a8\u5bfc\u5f0f\uff08Generator Comprehension\uff09<\/strong><\/h2>\n\n\n\n
    \u57fa\u672c\u8bed\u6cd5<\/strong><\/h3>\n\n\n\n
    (\u8868\u8fbe\u5f0f for \u53d8\u91cf in \u53ef\u8fed\u4ee3\u5bf9\u8c61 if \u6761\u4ef6)<\/code><\/pre>\n\n\n\n
    \ud83d\udd39 \u793a\u4f8b 1\uff1a\u521b\u5efa\u751f\u6210\u5668<\/strong><\/p>\n\n\n\n
    gen = (x ** 2 for x in range(1, 6))\nprint(next(gen))  # 1\nprint(next(gen))  # 4\nprint(list(gen))  # [9, 16, 25]<\/code><\/pre>\n\n\n\n
    \u751f\u6210\u5668\u63a8\u5bfc\u5f0f\u8fd4\u56de\u7684\u662f \u751f\u6210\u5668\u5bf9\u8c61<\/strong>\uff0c\u53ef\u4ee5\u4f7f\u7528 next()<\/code> \u9010\u6b65\u83b7\u53d6\u5143\u7d20\uff0c\u6216\u8005\u8f6c\u6362\u4e3a list()<\/code>\u3002<\/p>\n\n\n\n
    \n\n\n\n
    6. \u7ed3\u8bba<\/strong><\/h2>\n\n\n\n
    \u2705 \u5217\u8868\u63a8\u5bfc\u5f0f<\/strong> \u7528\u4e8e\u5feb\u901f\u521b\u5efa\u5217\u8868
    \u2705 \u5b57\u5178\u63a8\u5bfc\u5f0f<\/strong> \u7528\u4e8e\u6784\u5efa\u65b0\u7684\u952e\u503c\u5bf9\u5b57\u5178
    \u2705 \u96c6\u5408\u63a8\u5bfc\u5f0f<\/strong> \u7528\u4e8e\u521b\u5efa\u96c6\u5408\u5e76\u53bb\u91cd
    \u2705 \u751f\u6210\u5668\u63a8\u5bfc\u5f0f<\/strong> \u751f\u6210\u4e00\u4e2a\u53ef\u8fed\u4ee3\u7684\u751f\u6210\u5668\u5bf9\u8c61\uff0c\u8282\u7701\u5185\u5b58<\/p>\n\n\n\n
    \u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    Python \u63a8\u5bfc\u5f0f\u662f\u4e00\u79cd\u7b80\u6d01\u4e14\u5f3a\u5927\u7684\u8bed\u6cd5\uff0c\u7528\u4e8e\u5feb\u901f\u521b\u5efa \u5217\u8868\uff08List\uff09\u3001\u5b57\u5178\uff08Dictionary\uff09\u3001\u96c6\u5408 […]<\/p>\n","protected":false},"author":1,"featured_media":2755,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[79],"tags":[],"class_list":["post-2754","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python-3-"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2754","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=2754"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2754\/revisions"}],"predecessor-version":[{"id":2756,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2754\/revisions\/2756"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/2755"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2754"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2754"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2754"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}