{"id":156,"date":"2025-06-03T17:13:48","date_gmt":"2025-06-04T10:08:47","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=156"},"modified":"2025-06-04T17:13:48","modified_gmt":"2025-06-04T10:08:47","slug":"python-%e7%ad%86%e8%a8%98","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/python\/python-%e7%ad%86%e8%a8%98\/","title":{"rendered":"\u5982\u4f55\u5728Python\u4e2d\u6aa2\u67e5\u5b57\u5178\u662f\u5426\u5b58\u5728\u7279\u5b9a\u9375\u503c\uff1f2025 \u6700\u65b0\u6559\u5b78"},"content":{"rendered":"<p>&#8220;`html<br \/>\n<meta charset=\"utf-8\"><br \/>\n<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\"><br \/>\n<title>\u5982\u4f55\u5728Python\u4e2d\u6aa2\u67e5\u5b57\u5178\u662f\u5426\u5b58\u5728\u7279\u5b9a\u9375\u503c\uff1f2025 \u6700\u65b0\u6559\u5b78 &#8211; badgameshow.com<\/title><br \/>\n<meta name=\"description\" content=\"\u5b78\u7fd2\u5982\u4f55\u5728Python\u4e2d\u6aa2\u67e5\u5b57\u5178\u4e2d\u662f\u5426\u5b58\u5728\u7279\u5b9a\u9375\u503c\u3002\"><br \/>\n<meta name=\"keywords\" content=\"Python, \u5b57\u5178, \u6aa2\u67e5, \u9375\u503c, in, get, \u4ee3\u78bc\u793a\u4f8b\">\n<link rel=\"canonical\" href=\"https:\/\/badgameshow.com\/steven\/python\/python-dict-check-if-key-exists.html\">\n<link rel=\"stylesheet\" href=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.24.1\/themes\/prism-okaidia.min.css\">\n<h2>\u4ec0\u9ebc\u662fPython\u5b57\u5178\uff1f<\/h2>\n<p>\u5728Python\u4e2d\uff0c\u5b57\u5178\u662f\u4e00\u7a2e\u975e\u5e38\u6709\u7528\u7684\u6578\u64da\u985e\u578b\uff0c\u7531\u4e00\u7cfb\u5217\u9375\u503c\u5c0d\u7d44\u6210\uff0c\u5176\u4e2d\u6bcf\u500b\u9375\u90fd\u662f\u552f\u4e00\u7684\u3002\u8207\u5217\u8868\u4e0d\u540c\uff0c\u5b57\u5178\u662f\u7121\u5e8f\u7684\uff0c\u9019\u610f\u5473\u8457\u60a8\u4e0d\u80fd\u6309\u7167\u5b83\u5011\u5728\u5b57\u5178\u4e2d\u51fa\u73fe\u7684\u9806\u5e8f\u4f86\u8a2a\u554f\u5143\u7d20\u3002\u5b57\u5178\u975e\u5e38\u9069\u5408\u5b58\u5132\u5177\u6709\u8907\u96dc\u95dc\u4fc2\u7684\u6578\u64da\uff0c\u4f8b\u5982\u4eba\u54e1\u7684\u59d3\u540d\u548c\u5730\u5740\u3001\u5b78\u751f\u7684\u6210\u7e3e\u3001\u80a1\u7968\u5e02\u5834\u4e2d\u7684\u80a1\u7968\u4ee3\u78bc\u548c\u50f9\u683c\u7b49\u3002<\/p>\n<h2>\u5982\u4f55\u6aa2\u67e5Python\u5b57\u5178\u4e2d\u662f\u5426\u5b58\u5728\u7279\u5b9a\u9375\u503c\uff1f<\/h2>\n<p>\u8981\u6aa2\u67e5Python\u5b57\u5178\u4e2d\u662f\u5426\u5305\u542b\u7279\u5b9a\u7684\u9375\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>in<\/code> \u95dc\u9375\u5b57\u6216\u8005 <code>get()<\/code> \u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528\u9019\u5169\u7a2e\u65b9\u6cd5\u6aa2\u67e5\u5b57\u5178\u4e2d\u662f\u5426\u5b58\u5728\u540d\u70ba &#8220;ETH&#8221; \u7684\u9375\u7684\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n<pre><code class=\"language-python line-numbers\">buy_dict = {\"BTC\": 1, \"ETH\": 10, \"LTC\": 100}\n\n# \u4f7f\u7528 in \u95dc\u9375\u5b57\u6aa2\u67e5\u9375\u662f\u5426\u5b58\u5728\nif \"ETH\" in buy_dict:\n    print(\"\u8a72\u5b57\u5178\u4e2d\u5305\u542b\u540d\u70ba ETH \u7684\u9375\")\n    eth_value = buy_dict.get(\"ETH\")\n    if eth_value:\n        print(\"ETH \u7684\u6578\u91cf\u70ba\uff1a\", eth_value)\nelse:\n    print(\"\u8a72\u5b57\u5178\u4e2d\u4e0d\u5305\u542b\u540d\u70ba ETH \u7684\u9375\")\n<\/code><\/pre>\n<h2>\u6dfb\u52a0\u3001\u4fee\u6539\u548c\u522a\u9664Python\u5b57\u5178\u4e2d\u7684\u9375\u503c<\/h2>\n<p>\u8981\u5411Python\u5b57\u5178\u4e2d\u6dfb\u52a0\u65b0\u7684\u9375\u503c\u5c0d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>\u5b57\u5178[key] = value<\/code> \u7684\u8a9e\u6cd5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n<pre><code class=\"language-python line-numbers\">buy_dict = {\"BTC\": 1, \"ETH\": 10, \"LTC\": 100}\nbuy_dict[\"DOGE\"] = 1000  # \u6dfb\u52a0\u65b0\u7684\u9375\u503c\u5c0d\nprint(buy_dict)  # \u8f38\u51fa: {'BTC': 1, 'ETH': 10, 'LTC': 100, 'DOGE': 1000}\n<\/code><\/pre>\n<p>\u8981\u4fee\u6539Python\u5b57\u5178\u4e2d\u7684\u9375\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528\u8207\u6dfb\u52a0\u9375\u503c\u5c0d\u76f8\u540c\u7684\u8a9e\u6cd5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n<pre><code class=\"language-python line-numbers\">buy_dict[\"ETH\"] = 20  # \u4fee\u6539\u9375 \"ETH\" \u5c0d\u61c9\u7684\u503c\nprint(buy_dict)  # \u8f38\u51fa: {'BTC': 1, 'ETH': 20, 'LTC': 100, 'DOGE': 1000}\n<\/code><\/pre>\n<p>\u8981\u5f9ePython\u5b57\u5178\u4e2d\u522a\u9664\u7279\u5b9a\u7684\u9375\u503c\u5c0d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>del \u5b57\u5178[key]<\/code> \u7684\u8a9e\u6cd5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n<pre><code class=\"language-python line-numbers\">del buy_dict[\"LTC\"]  # \u522a\u9664\u9375\u70ba \"LTC\" \u7684\u9375\u503c\u5c0d\nprint(buy_dict)  # \u8f38\u51fa: {'BTC': 1, 'ETH': 20, 'DOGE': 1000}\n<\/code><\/pre>\n<h2>\u5ef6\u4f38\u61c9\u7528<\/h2>\n<p>\u5728\u8a31\u591a\u61c9\u7528\u4e2d\uff0c\u5b57\u5178\u7684\u904b\u7528\u975e\u5e38\u5ee3\u6cdb\uff0c\u4f8b\u5982\u5b58\u5132\u914d\u7f6e\u53c3\u6578\u3001\u8a08\u6578\u5668\u3001\u4ee5\u53ca\u67e5\u8a62\u6578\u64da\u7b49\u3002\u5982\u679c\u60a8\u60f3\u9032\u4e00\u6b65\u5b78\u7fd2Python\u5b57\u5178\u7684\u64cd\u4f5c\uff0c\u8acb\u53c3\u8003\u66f4\u591a\u7684Python\u6559\u5b78\u6587\u7ae0\uff0c\u4f8b\u5982[Python\u57fa\u790e\u77e5\u8b58\u7b46\u8a18](https:\/\/badgameshow.com\/steven\/python\/python-\u7b46\u8a18)\u3002<\/p>\n<h2>Q&#038;A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/h2>\n<h3>Q: \u5982\u4f55\u77e5\u9053\u5b57\u5178\u4e2d\u6709\u591a\u5c11\u500b\u9375\u503c\u5c0d\uff1f<\/h3>\n<p>A: \u53ef\u4ee5\u4f7f\u7528 <code>len(dict)<\/code> \u51fd\u6578\u4f86\u7372\u53d6\u5b57\u5178\u4e2d\u9375\u503c\u5c0d\u7684\u6578\u91cf\u3002\u4f8b\u5982\uff0c<code>len(buy_dict)<\/code> \u5c07\u8fd4\u56de\u5b57\u5178\u7684\u9375\u503c\u5c0d\u6578\u91cf\u3002<\/p>\n<h3>Q: \u5982\u4f55\u5408\u4f75\u5169\u500b\u5b57\u5178\uff1f<\/h3>\n<p>A: \u5728Python 3.9\u53ca\u4ee5\u4e0a\u7248\u672c\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>dict1 | dict2<\/code> \u7684\u8a9e\u6cd5\u4f86\u5408\u4f75\u5b57\u5178\u3002\u82e5\u60a8\u4f7f\u7528\u7684\u662f\u820a\u7248\u672c\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>dict1.update(dict2)<\/code> \u65b9\u6cd5\u3002<\/p>\n<h3>Q: \u5982\u679c\u5b57\u5178\u4e2d\u6c92\u6709\u8a72\u9375\uff0c<code>get()<\/code> \u65b9\u6cd5\u6703\u8fd4\u56de\u4ec0\u9ebc\uff1f<\/h3>\n<p>A: \u5982\u679c\u4f7f\u7528 <code>get()<\/code> \u65b9\u6cd5\u67e5\u8a62\u7684\u9375\u4e0d\u5b58\u5728\uff0c\u5c07\u8fd4\u56de <code>None<\/code>\uff0c\u60a8\u4e5f\u53ef\u4ee5\u6307\u5b9a\u4e00\u500b\u9ed8\u8a8d\u503c\uff0c\u4f8b\u5982 <code>buy_dict.get(\"XYZ\", 0)<\/code>\uff0c\u9019\u6a23\u5982\u679c\u9375 &#8220;XYZ&#8221; \u4e0d\u5b58\u5728\uff0c\u5247\u8fd4\u56de 0\u3002<\/p>\n<p><script src=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.24.1\/prism.min.js\"><\/script><br \/>\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs\/components\/prism-python.min.js\"><\/script><br \/>\n&#8220;`<br \/>\n&#8212;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#8220;`html \u5982\u4f55\u5728Python\u4e2d\u6aa2\u67e5&#8230;<\/p>\n","protected":false},"author":1,"featured_media":2518,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"aside","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[18],"tags":[],"class_list":["post-156","post","type-post","status-publish","format-aside","has-post-thumbnail","hentry","category-python","post_format-post-format-aside"],"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\/pcFK27-2w","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/156","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=156"}],"version-history":[{"count":8,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/156\/revisions"}],"predecessor-version":[{"id":13075,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/156\/revisions\/13075"}],"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=156"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=156"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=156"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}