{"id":1088059,"date":"2025-01-08T13:40:53","date_gmt":"2025-01-08T05:40:53","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1088059.html"},"modified":"2025-01-08T13:40:55","modified_gmt":"2025-01-08T05:40:55","slug":"%e5%a6%82%e4%bd%95%e6%89%93%e5%8d%b0%e5%ad%97%e5%85%b8%e4%b8%ad%e7%9a%84%e9%94%aepython-2","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1088059.html","title":{"rendered":"\u5982\u4f55\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952epython"},"content":{"rendered":"

\"\u5982\u4f55\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952epython\"<\/p>\n

\u8981\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e\uff0c\u53ef\u4ee5\u4f7f\u7528 for \u5faa\u73af\u3001keys() \u65b9\u6cd5\u3001\u4f7f\u7528\u5217\u8868\u89e3\u6790\u3001\u76f4\u63a5\u4f7f\u7528\u5b57\u5178\u5bf9\u8c61\u7b49\u65b9\u6cd5<\/strong>\u3002\u5176\u4e2d\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528 for \u5faa\u73af\u6765\u904d\u5386\u5b57\u5178\u5e76\u6253\u5370\u6bcf\u4e2a\u952e\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u63cf\u8ff0\u4f7f\u7528 for \u5faa\u73af\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u5728 Python \u4e2d\uff0c\u5b57\u5178\u662f\u4e00\u79cd\u7528\u4e8e\u5b58\u50a8\u952e\u503c\u5bf9\u7684\u6570\u636e\u7ed3\u6784\u3002\u8981\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e\uff0c\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u5b9e\u73b0\uff0c\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\u53ca\u5176\u4f7f\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528 for \u5faa\u73af\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e<\/strong><\/h2>\n

\u4f7f\u7528 for \u5faa\u73af\u662f\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e\u6700\u5e38\u89c1\u7684\u65b9\u6cd5\u4e4b\u4e00\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<\/p>\n

my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
for key in my_dict:<\/p>\n
    print(key)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5b57\u5178 my_dict<\/code>\uff0c\u7136\u540e\u4f7f\u7528 for \u5faa\u73af\u904d\u5386\u5b57\u5178\u4e2d\u7684\u952e\u5e76\u6253\u5370\u6bcf\u4e2a\u952e\u3002\u8fd9\u79cd\u65b9\u6cd5\u7b80\u5355\u76f4\u89c2\uff0c\u975e\u5e38\u9002\u5408\u521d\u5b66\u8005\u4f7f\u7528\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528 keys() \u65b9\u6cd5\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e<\/strong><\/h2>\n
\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u4f7f\u7528\u5b57\u5178\u7684 keys()<\/code> \u65b9\u6cd5\u3002keys()<\/code> \u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u5b57\u5178\u4e2d\u6240\u6709\u952e\u7684\u89c6\u56fe\u5bf9\u8c61\u3002\u53ef\u4ee5\u4f7f\u7528 for \u5faa\u73af\u904d\u5386\u8fd9\u4e2a\u89c6\u56fe\u5bf9\u8c61\u5e76\u6253\u5370\u6bcf\u4e2a\u952e\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
for key in my_dict.keys():<\/p>\n
    print(key)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u4e0e\u7b2c\u4e00\u79cd\u65b9\u6cd5\u7c7b\u4f3c\uff0c\u4f46\u66f4\u52a0\u663e\u5f0f\u5730\u8868\u660e\u6211\u4eec\u53ea\u5bf9\u5b57\u5178\u7684\u952e\u611f\u5174\u8da3\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528\u5217\u8868\u89e3\u6790\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e<\/strong><\/h2>\n
\u5217\u8868\u89e3\u6790\u662f\u4e00\u79cd\u7b80\u6d01\u7684\u65b9\u5f0f\uff0c\u53ef\u4ee5\u5728\u4e00\u884c\u4ee3\u7801\u4e2d\u5b9e\u73b0\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
[print(key) for key in my_dict]<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u5e0c\u671b\u5728\u4e00\u884c\u4ee3\u7801\u4e2d\u5b8c\u6210\u64cd\u4f5c\u7684\u573a\u666f\uff0c\u4f46\u4e0d\u5efa\u8bae\u5728\u4ee3\u7801\u53ef\u8bfb\u6027\u4f18\u5148\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528\u3002<\/p>\n<\/p>\n
\u56db\u3001\u76f4\u63a5\u4f7f\u7528\u5b57\u5178\u5bf9\u8c61\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e<\/strong><\/h2>\n
\u5728 Python 3 \u4e2d\uff0c\u5b57\u5178\u5bf9\u8c61\u672c\u8eab\u662f\u53ef\u8fed\u4ee3\u7684\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u8fed\u4ee3\u7684\u662f\u5b57\u5178\u7684\u952e\u3002\u56e0\u6b64\uff0c\u53ef\u4ee5\u76f4\u63a5\u5c06\u5b57\u5178\u5bf9\u8c61\u4f20\u9012\u7ed9 print() \u51fd\u6570\u6765\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
print(list(my_dict))<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u4f1a\u5c06\u5b57\u5178\u7684\u952e\u8f6c\u6362\u4e3a\u5217\u8868\u5e76\u6253\u5370\u51fa\u6765\uff0c\u9002\u7528\u4e8e\u9700\u8981\u5c06\u952e\u4f5c\u4e3a\u6574\u4f53\u8f93\u51fa\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u4f7f\u7528 map() \u51fd\u6570\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e<\/strong><\/h2>\n
map()<\/code> \u51fd\u6570\u53ef\u4ee5\u5c06\u4e00\u4e2a\u51fd\u6570\u5e94\u7528\u5230\u4e00\u4e2a\u53ef\u8fed\u4ee3\u5bf9\u8c61\u7684\u6bcf\u4e2a\u5143\u7d20\u4e0a\u3002\u53ef\u4ee5\u4f7f\u7528 map()<\/code> \u51fd\u6570\u4e0e print()<\/code> \u51fd\u6570\u7ed3\u5408\u6765\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
list(map(print, my_dict))<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u4e0d\u592a\u5e38\u7528\uff0c\u4f46\u5728\u67d0\u4e9b\u7279\u5b9a\u573a\u666f\u4e0b\u53ef\u80fd\u4f1a\u6709\u7528\u3002<\/p>\n<\/p>\n
\u516d\u3001\u4f7f\u7528\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e<\/strong><\/h2>\n
\u5728\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u6765\u81ea\u5b9a\u4e49\u8f93\u51fa\u683c\u5f0f\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
for key in my_dict:<\/p>\n
    print(f'Key: {key}')<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u5728\u6253\u5370\u952e\u65f6\u6dfb\u52a0\u989d\u5916\u4fe1\u606f\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n
\u4e03\u3001\u4f7f\u7528\u5b57\u5178\u89c6\u56fe\u5bf9\u8c61\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e<\/strong><\/h2>\n
\u5b57\u5178\u89c6\u56fe\u5bf9\u8c61\u63d0\u4f9b\u4e86\u4e00\u79cd\u52a8\u6001\u67e5\u770b\u5b57\u5178\u5185\u5bb9\u7684\u65b9\u5f0f\u3002\u53ef\u4ee5\u4f7f\u7528 dict_keys<\/code> \u5bf9\u8c61\u76f4\u63a5\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
keys_view = my_dict.keys()<\/p>\n
print(keys_view)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u52a8\u6001\u67e5\u770b\u5b57\u5178\u952e\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n
\u516b\u3001\u5c06\u5b57\u5178\u952e\u8f6c\u6362\u4e3a\u5217\u8868\u6216\u96c6\u5408\u6253\u5370<\/strong><\/h2>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u5c06\u5b57\u5178\u7684\u952e\u8f6c\u6362\u4e3a\u5217\u8868\u6216\u96c6\u5408\u6765\u8fdb\u884c\u64cd\u4f5c\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
keys_list = list(my_dict.keys())<\/p>\n
print(keys_list)<\/p>\n
keys_set = set(my_dict.keys())<\/p>\n
print(keys_set)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u8fdb\u4e00\u6b65\u64cd\u4f5c\u5b57\u5178\u952e\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n
\u4e5d\u3001\u4f7f\u7528 sorted() \u51fd\u6570\u6253\u5370\u6392\u5e8f\u540e\u7684\u5b57\u5178\u952e<\/strong><\/h2>\n
\u5728\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 sorted()<\/code> \u51fd\u6570\u5bf9\u952e\u8fdb\u884c\u6392\u5e8f\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
for key in sorted(my_dict.keys()):<\/p>\n
    print(key)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u4ee5\u7279\u5b9a\u987a\u5e8f\u6253\u5370\u5b57\u5178\u952e\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n
\u5341\u3001\u4f7f\u7528 itertools.chAI<\/a>n() \u51fd\u6570\u6253\u5370\u591a\u4e2a\u5b57\u5178\u7684\u952e<\/strong><\/h2>\n
\u5728\u5904\u7406\u591a\u4e2a\u5b57\u5178\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528 itertools.chain()<\/code> \u51fd\u6570\u5c06\u591a\u4e2a\u5b57\u5178\u7684\u952e\u8fde\u63a5\u8d77\u6765\u5e76\u6253\u5370\u3002\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
import itertools<\/p>\n
dict1 = {'name': 'Alice', 'age': 25}<\/p>\n
dict2 = {'city': 'New York', 'country': 'USA'}<\/p>\n
for key in itertools.chain(dict1.keys(), dict2.keys()):<\/p>\n
    print(key)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u5904\u7406\u591a\u4e2a\u5b57\u5178\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n
\u4ee5\u4e0a\u5c31\u662f\u5173\u4e8e\u5982\u4f55\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e\u7684\u8be6\u7ec6\u4ecb\u7ecd\u3002\u4e0d\u540c\u7684\u65b9\u6cd5\u9002\u7528\u4e8e\u4e0d\u540c\u7684\u573a\u666f\uff0c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u63d0\u53d6\u5b57\u5178\u7684\u6240\u6709\u952e\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528dict.keys()<\/code>\u65b9\u6cd5\u63d0\u53d6\u5b57\u5178\u4e2d\u7684\u6240\u6709\u952e\u3002\u8fd9\u4e2a\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u89c6\u56fe\u5bf9\u8c61\uff0c\u53ef\u4ee5\u76f4\u63a5\u904d\u5386\u6216\u8005\u8f6c\u6362\u4e3a\u5217\u8868\u3002\u4f8b\u5982\uff1a  <\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}\nkeys = my_dict.keys()\nprint(keys)  # \u8f93\u51fa\uff1adict_keys(['a', 'b', 'c'])\n<\/code><\/pre>\n
\u5982\u679c\u60f3\u8981\u5c06\u952e\u8f6c\u6362\u6210\u5217\u8868\uff0c\u53ef\u4ee5\u4f7f\u7528list()<\/code>\u51fd\u6570\uff1a  <\/p>\n
key_list = list(my_dict.keys())\nprint(key_list)  # \u8f93\u51fa\uff1a['a', 'b', 'c']\n<\/code><\/pre>\n
\u600e\u6837\u5728\u6253\u5370\u5b57\u5178\u952e\u65f6\u6dfb\u52a0\u81ea\u5b9a\u4e49\u683c\u5f0f\uff1f<\/strong>
\u8981\u5728\u6253\u5370\u5b57\u5178\u7684\u952e\u65f6\u6dfb\u52a0\u81ea\u5b9a\u4e49\u683c\u5f0f\uff0c\u53ef\u4ee5\u4f7f\u7528\u5faa\u73af\u7ed3\u5408\u5b57\u7b26\u4e32\u683c\u5f0f\u5316\u3002\u4f8b\u5982\uff1a  <\/p>\n
my_dict = {'name': 'Alice', 'age': 30, 'city': 'New York'}\nfor key in my_dict.keys():\n    print(f"Key: {key}")\n<\/code><\/pre>\n
\u8fd9\u6837\u7684\u683c\u5f0f\u5316\u8f93\u51fa\u53ef\u4ee5\u8ba9\u7ed3\u679c\u66f4\u5177\u53ef\u8bfb\u6027\u3002<\/p>\n
\u6709\u4ec0\u4e48\u65b9\u6cd5\u53ef\u4ee5\u6309\u7279\u5b9a\u987a\u5e8f\u6253\u5370\u5b57\u5178\u7684\u952e\uff1f<\/strong>
\u4e3a\u4e86\u6309\u7279\u5b9a\u987a\u5e8f\u6253\u5370\u5b57\u5178\u7684\u952e\uff0c\u53ef\u4ee5\u4f7f\u7528sorted()<\/code>\u51fd\u6570\u5bf9\u952e\u8fdb\u884c\u6392\u5e8f\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a  <\/p>\n
my_dict = {'b': 2, 'a': 1, 'c': 3}\nfor key in sorted(my_dict.keys()):\n    print(key)  # \u8f93\u51fa\uff1aa, b, c\n<\/code><\/pre>\n
\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5e2e\u52a9\u4f60\u4ee5\u5b57\u6bcd\u987a\u5e8f\u6216\u5176\u4ed6\u81ea\u5b9a\u4e49\u987a\u5e8f\u6253\u5370\u952e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u8981\u6253\u5370\u5b57\u5178\u4e2d\u7684\u952e\uff0c\u53ef\u4ee5\u4f7f\u7528 for \u5faa\u73af\u3001keys() \u65b9\u6cd5\u3001\u4f7f\u7528\u5217\u8868\u89e3\u6790\u3001\u76f4\u63a5\u4f7f\u7528\u5b57\u5178\u5bf9\u8c61\u7b49\u65b9\u6cd5\u3002\u5176\u4e2d\u4e00\u79cd\u65b9 […]","protected":false},"author":3,"featured_media":1088063,"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\/1088059"}],"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=1088059"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1088059\/revisions"}],"predecessor-version":[{"id":1088067,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1088059\/revisions\/1088067"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1088063"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1088059"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1088059"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1088059"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}