{"id":952840,"date":"2024-12-27T01:36:50","date_gmt":"2024-12-26T17:36:50","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/952840.html"},"modified":"2024-12-27T01:36:52","modified_gmt":"2024-12-26T17:36:52","slug":"python%e5%a6%82%e4%bd%95%e8%8e%b7%e5%8f%96keys","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/952840.html","title":{"rendered":"python\u5982\u4f55\u83b7\u53d6keys"},"content":{"rendered":"

\"python\u5982\u4f55\u83b7\u53d6keys\"<\/p>\n

\u5728Python\u4e2d\u83b7\u53d6\u5b57\u5178\u7684\u952e\u53ef\u4ee5\u4f7f\u7528\u591a\u79cd\u65b9\u6cd5\uff0c\u6bd4\u5982\u4f7f\u7528keys()<\/code>\u65b9\u6cd5\u3001for<\/code>\u5faa\u73af\u904d\u5386\u5b57\u5178\u3001\u89e3\u5305\u5b57\u5178\u7b49\u3002\u5176\u4e2d\uff0c\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u4f7f\u7528keys()<\/code>\u65b9\u6cd5<\/strong>\u3002\u4ee5\u4e0b\u5c06\u8be6\u7ec6\u8bb2\u89e3\u5982\u4f55\u4f7f\u7528keys()<\/code>\u65b9\u6cd5\u83b7\u53d6\u5b57\u5178\u7684\u952e\uff0c\u5e76\u4ecb\u7ecd\u5176\u4ed6\u51e0\u79cd\u5e38\u89c1\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528keys()<\/code>\u65b9\u6cd5<\/p>\n<\/p>\n

Python\u63d0\u4f9b\u4e86\u5b57\u5178\u5bf9\u8c61\u7684\u4e00\u4e2a\u65b9\u6cd5keys()<\/code>\uff0c\u53ef\u4ee5\u76f4\u63a5\u8fd4\u56de\u5b57\u5178\u4e2d\u6240\u6709\u952e\u7684\u89c6\u56fe\u5bf9\u8c61\u3002\u8fd9\u4e2a\u89c6\u56fe\u5bf9\u8c61\u662f\u52a8\u6001\u7684\uff0c\u5373\u5b83\u4f1a\u968f\u7740\u5b57\u5178\u7684\u53d8\u5316\u800c\u53d8\u5316\u3002\u901a\u8fc7keys()<\/code>\u65b9\u6cd5\u83b7\u53d6\u7684\u952e\u53ef\u4ee5\u7528\u4e8e\u8fed\u4ee3\u3001\u8f6c\u6362\u4e3a\u5217\u8868\u7b49\u64cd\u4f5c\u3002<\/p>\n<\/p>\n

# \u793a\u4f8b\u4ee3\u7801<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
keys = my_dict.keys()<\/p>\n
print(keys)  # \u8f93\u51fa\uff1adict_keys(['a', 'b', 'c'])<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5b57\u5178my_dict<\/code>\uff0c\u901a\u8fc7\u8c03\u7528my_dict.keys()<\/code>\u83b7\u53d6\u5b57\u5178\u7684\u952e\u3002\u8fd9\u4e2a\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2adict_keys<\/code>\u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u652f\u6301\u8fed\u4ee3\uff0c\u53ef\u4ee5\u76f4\u63a5\u7528\u4e8efor<\/code>\u5faa\u73af\u6216\u8f6c\u6362\u4e3a\u5217\u8868\u3002<\/p>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0keys()<\/code>\u65b9\u6cd5\u7684\u4f18\u52bf\uff1a<\/strong><\/p>\n<\/p>\n
keys()<\/code>\u65b9\u6cd5\u7684\u4e3b\u8981\u4f18\u52bf\u5728\u4e8e\u5176\u7b80\u6d01\u6027\u548c\u6548\u7387\u3002\u76f8\u6bd4\u4e8e\u5176\u4ed6\u65b9\u6cd5\uff0ckeys()<\/code>\u65b9\u6cd5\u4e0d\u9700\u8981\u989d\u5916\u7684\u5faa\u73af\u6216\u89e3\u5305\u64cd\u4f5c\uff0c\u76f4\u63a5\u8c03\u7528\u5373\u53ef\u83b7\u5f97\u5b57\u5178\u952e\u7684\u89c6\u56fe\u3002\u6b64\u5916\uff0ckeys()<\/code>\u65b9\u6cd5\u7684\u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u52a8\u6001\u89c6\u56fe\u5bf9\u8c61\uff0c\u8fd9\u610f\u5473\u7740\u5982\u679c\u5b57\u5178\u5728\u540e\u7eed\u64cd\u4f5c\u4e2d\u53d1\u751f\u66f4\u6539\uff0c\u8be5\u89c6\u56fe\u5bf9\u8c61\u4f1a\u81ea\u52a8\u66f4\u65b0\u3002\u8fd9\u79cd\u7279\u6027\u5728\u9700\u8981\u52a8\u6001\u76d1\u63a7\u5b57\u5178\u5185\u5bb9\u53d8\u5316\u7684\u573a\u666f\u4e0b\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528for<\/code>\u5faa\u73af\u904d\u5386\u5b57\u5178<\/p>\n<\/p>\n
\u901a\u8fc7for<\/code>\u5faa\u73af\u76f4\u63a5\u904d\u5386\u5b57\u5178\u4e5f\u53ef\u4ee5\u83b7\u53d6\u5230\u5b57\u5178\u7684\u952e\u3002\u5728Python\u4e2d\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u904d\u5386\u5b57\u5178\u65f6\u4f1a\u904d\u5386\u5176\u952e\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u4ee3\u7801<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
for key in my_dict:<\/p>\n
    print(key)  # \u8f93\u51fa\uff1aa b c<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528for<\/code>\u5faa\u73af\u76f4\u63a5\u904d\u5386\u5b57\u5178my_dict<\/code>\uff0c\u6bcf\u6b21\u8fed\u4ee3\u90fd\u4f1a\u83b7\u5f97\u4e00\u4e2a\u952e\u3002\u8fd9\u79cd\u65b9\u6cd5\u7b80\u6d01\u660e\u4e86\uff0c\u9002\u7528\u4e8e\u9700\u8981\u5bf9\u6bcf\u4e2a\u952e\u8fdb\u884c\u64cd\u4f5c\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528\u89e3\u5305\u64cd\u4f5c\u7b26*<\/code><\/p>\n<\/p>\n
Python\u7684\u89e3\u5305\u64cd\u4f5c\u7b26*<\/code>\u4e5f\u53ef\u4ee5\u7528\u4e8e\u4ece\u5b57\u5178\u4e2d\u63d0\u53d6\u952e\u3002\u89e3\u5305\u64cd\u4f5c\u7b26\u53ef\u4ee5\u5c06\u4e00\u4e2a\u53ef\u8fed\u4ee3\u5bf9\u8c61\u89e3\u5305\u4e3a\u591a\u4e2a\u5143\u7d20\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u4ee3\u7801<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
keys = [*my_dict]<\/p>\n
print(keys)  # \u8f93\u51fa\uff1a['a', 'b', 'c']<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u89e3\u5305\u64cd\u4f5c\u7b26*<\/code>\u5c06\u5b57\u5178my_dict<\/code>\u89e3\u5305\u4e3a\u4e00\u4e2a\u5217\u8868\uff0c\u8be5\u5217\u8868\u5305\u542b\u4e86\u5b57\u5178\u7684\u6240\u6709\u952e\u3002\u6b64\u65b9\u6cd5\u9002\u5408\u9700\u8981\u5c06\u952e\u8f6c\u6362\u4e3a\u5176\u4ed6\u6570\u636e\u7ed3\u6784\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528\u5b57\u5178\u63a8\u5bfc\u5f0f<\/p>\n<\/p>\n
\u5b57\u5178\u63a8\u5bfc\u5f0f\u53ef\u4ee5\u7528\u4e8e\u4ece\u4e00\u4e2a\u5b57\u5178\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b57\u5178\u6216\u5176\u4ed6\u6570\u636e\u7ed3\u6784\u3002\u5728\u83b7\u53d6\u5b57\u5178\u952e\u7684\u573a\u666f\u4e2d\uff0c\u5b57\u5178\u63a8\u5bfc\u5f0f\u53ef\u4ee5\u7528\u4e8e\u751f\u6210\u5305\u542b\u5b57\u5178\u952e\u7684\u5217\u8868\u6216\u96c6\u5408\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u4ee3\u7801<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
keys_list = [key for key in my_dict]<\/p>\n
print(keys_list)  # \u8f93\u51fa\uff1a['a', 'b', 'c']<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u5b57\u5178\u63a8\u5bfc\u5f0f\u751f\u6210\u4e00\u4e2a\u5305\u542b\u5b57\u5178my_dict<\/code>\u952e\u7684\u5217\u8868\u3002\u8fd9\u79cd\u65b9\u6cd5\u7075\u6d3b\u6027\u8f83\u9ad8\uff0c\u53ef\u4ee5\u5728\u751f\u6210\u5217\u8868\u7684\u540c\u65f6\u8fdb\u884c\u952e\u7684\u8fc7\u6ee4\u6216\u8f6c\u6362\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u8f6c\u6362\u4e3a\u5217\u8868\u6216\u96c6\u5408<\/p>\n<\/p>\n
\u4ece\u5b57\u5178\u4e2d\u83b7\u53d6\u7684\u952e\u89c6\u56fe\u5bf9\u8c61\u53ef\u4ee5\u76f4\u63a5\u8f6c\u6362\u4e3a\u5217\u8868\u6216\u96c6\u5408\uff0c\u8fd9\u6837\u53ef\u4ee5\u65b9\u4fbf\u5730\u5bf9\u952e\u8fdb\u884c\u6392\u5e8f\u3001\u53bb\u91cd\u7b49\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u4ee3\u7801<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
keys_list = list(my_dict.keys())<\/p>\n
keys_set = set(my_dict.keys())<\/p>\n
print(keys_list)  # \u8f93\u51fa\uff1a['a', 'b', 'c']<\/p>\n
print(keys_set)   # \u8f93\u51fa\uff1a{'a', 'b', 'c'}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u5c06\u5b57\u5178\u952e\u7684\u89c6\u56fe\u5bf9\u8c61\u5206\u522b\u8f6c\u6362\u4e3a\u5217\u8868\u548c\u96c6\u5408\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u53ef\u4ee5\u5bf9\u952e\u8fdb\u884c\u66f4\u591a\u7684\u64cd\u4f5c\uff0c\u5982\u6392\u5e8f\u3001\u53bb\u91cd\u7b49\u3002<\/p>\n<\/p>\n
\u603b\u7ed3<\/p>\n<\/p>\n
\u5728Python\u4e2d\u83b7\u53d6\u5b57\u5178\u7684\u952e\u6709\u591a\u79cd\u65b9\u6cd5\uff0c\u5176\u4e2dkeys()<\/code>\u65b9\u6cd5\u662f\u6700\u5e38\u7528\u4e14\u7b80\u6d01\u9ad8\u6548\u7684\u9009\u62e9\u3002\u6839\u636e\u5177\u4f53\u5e94\u7528\u573a\u666f\uff0c\u53ef\u4ee5\u9009\u62e9\u9002\u5408\u7684\u65b9\u6cd5\u6765\u83b7\u53d6\u5b57\u5178\u7684\u952e\uff0c\u8fdb\u800c\u8fdb\u884c\u540e\u7eed\u7684\u6570\u636e\u5904\u7406\u548c\u64cd\u4f5c\u3002\u65e0\u8bba\u4f7f\u7528\u54ea\u79cd\u65b9\u6cd5\uff0c\u7406\u89e3\u5b57\u5178\u952e\u7684\u89c6\u56fe\u5bf9\u8c61\u7279\u6027\u4ee5\u53ca\u4e0d\u540c\u65b9\u6cd5\u7684\u4f18\u52a3\u662f\u7f16\u5199\u9ad8\u6548Python\u4ee3\u7801\u7684\u57fa\u7840\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u83b7\u53d6\u5b57\u5178\u7684\u6240\u6709\u952e\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u7684keys()<\/code>\u65b9\u6cd5\u83b7\u53d6\u6240\u6709\u7684\u952e\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a  <\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}\nkeys = my_dict.keys()\nprint(keys)  # \u8f93\u51fa: dict_keys(['name', 'age', 'city'])\n<\/code><\/pre>\n
\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0ckeys()<\/code>\u65b9\u6cd5\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u89c6\u56fe\u5bf9\u8c61\uff0c\u5982\u679c\u60f3\u8981\u5c06\u5176\u8f6c\u6362\u4e3a\u5217\u8868\uff0c\u53ef\u4ee5\u4f7f\u7528list()<\/code>\u51fd\u6570\u3002<\/p>\n
\u53ef\u4ee5\u4f7f\u7528\u54ea\u4e9b\u65b9\u6cd5\u6765\u904d\u5386\u5b57\u5178\u7684\u952e\uff1f<\/strong>
\u904d\u5386\u5b57\u5178\u7684\u952e\u6709\u591a\u79cd\u65b9\u5f0f\u3002\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u4f7f\u7528for<\/code>\u5faa\u73af\uff0c\u5982\u4e0b\u6240\u793a\uff1a  <\/p>\n
for key in my_dict:\n    print(key)\n<\/code><\/pre>\n
\u53e6\u5916\uff0c\u4e5f\u53ef\u4ee5\u76f4\u63a5\u904d\u5386my_dict.keys()<\/code>\uff0c\u6548\u679c\u76f8\u540c\u3002\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u65b9\u4fbf\u5730\u5bf9\u6bcf\u4e2a\u952e\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n
\u83b7\u53d6\u5b57\u5178\u952e\u7684\u540c\u65f6\u5982\u4f55\u83b7\u53d6\u5bf9\u5e94\u7684\u503c\uff1f<\/strong>
\u5982\u679c\u9700\u8981\u5728\u83b7\u53d6\u5b57\u5178\u7684\u952e\u7684\u540c\u65f6\u83b7\u53d6\u5bf9\u5e94\u7684\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528items()<\/code>\u65b9\u6cd5\u3002\u8fd9\u4e2a\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u952e\u503c\u5bf9\u7684\u89c6\u56fe\uff0c\u53ef\u4ee5\u540c\u65f6\u8bbf\u95ee\u952e\u548c\u503c\u3002\u793a\u4f8b\u5982\u4e0b\uff1a  <\/p>\n
for key, value in my_dict.items():\n    print(f'Key: {key}, Value: {value}')\n<\/code><\/pre>\n
\u8fd9\u79cd\u65b9\u5f0f\u7279\u522b\u9002\u5408\u9700\u8981\u540c\u65f6\u5904\u7406\u952e\u548c\u503c\u7684\u573a\u666f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\u83b7\u53d6\u5b57\u5178\u7684\u952e\u53ef\u4ee5\u4f7f\u7528\u591a\u79cd\u65b9\u6cd5\uff0c\u6bd4\u5982\u4f7f\u7528keys()\u65b9\u6cd5\u3001for\u5faa\u73af\u904d\u5386\u5b57\u5178\u3001\u89e3\u5305\u5b57\u5178\u7b49\u3002\u5176\u4e2d\uff0c […]","protected":false},"author":3,"featured_media":952843,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/952840"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=952840"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/952840\/revisions"}],"predecessor-version":[{"id":952844,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/952840\/revisions\/952844"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/952843"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=952840"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=952840"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=952840"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}