{"id":946940,"date":"2024-12-26T23:47:06","date_gmt":"2024-12-26T15:47:06","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/946940.html"},"modified":"2024-12-26T23:47:08","modified_gmt":"2024-12-26T15:47:08","slug":"python%e5%a6%82%e4%bd%95%e8%8e%b7%e5%8f%96key","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/946940.html","title":{"rendered":"python\u5982\u4f55\u83b7\u53d6key"},"content":{"rendered":"

\"python\u5982\u4f55\u83b7\u53d6key\"<\/p>\n

Python\u5982\u4f55\u83b7\u53d6key<\/strong>\uff1a\u5728Python\u4e2d\u83b7\u53d6key\u7684\u5e38\u7528\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528\u5b57\u5178\u7684keys()\u65b9\u6cd5\u3001\u901a\u8fc7\u904d\u5386\u5b57\u5178\u6765\u83b7\u53d6\u3001\u4f7f\u7528get()\u65b9\u6cd5\u6765\u5b89\u5168\u83b7\u53d6\u3001\u901a\u8fc7\u5f02\u5e38\u5904\u7406\u6765\u83b7\u53d6<\/strong>\u3002\u5176\u4e2d\uff0c\u4f7f\u7528\u5b57\u5178\u7684keys()\u65b9\u6cd5\u662f\u6700\u5e38\u89c1\u548c\u76f4\u63a5\u7684\u65b9\u5f0f\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u5b57\u5178\u6240\u6709\u952e\u7684\u89c6\u56fe\u5bf9\u8c61\uff0c\u53ef\u4ee5\u7528list()\u5c06\u5176\u8f6c\u6362\u4e3a\u5217\u8868\u5f62\u5f0f\uff0c\u4ece\u800c\u8fdb\u884c\u64cd\u4f5c\u548c\u5904\u7406\u3002\u901a\u8fc7\u904d\u5386\u5b57\u5178\u6765\u83b7\u53d6\u952e\u4e5f\u5f88\u5e38\u7528\uff0c\u7279\u522b\u662f\u5728\u9700\u8981\u5bf9\u952e\u8fdb\u884c\u8fdb\u4e00\u6b65\u64cd\u4f5c\u65f6\u3002\u800c\u4f7f\u7528get()\u65b9\u6cd5\u548c\u5f02\u5e38\u5904\u7406\u5219\u63d0\u4f9b\u4e86\u4e00\u79cd\u66f4\u4e3a\u5b89\u5168\u7684\u65b9\u5f0f\u6765\u83b7\u53d6\u952e\uff0c\u907f\u514d\u56e0\u952e\u4e0d\u5b58\u5728\u800c\u5bfc\u81f4\u7684\u9519\u8bef\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e9b\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528\u5b57\u5178\u7684keys()\u65b9\u6cd5<\/p>\n<\/p>\n

\u5728Python\u4e2d\uff0c\u5b57\u5178\u662f\u4e00\u79cd\u53ef\u53d8\u7684\u3001\u65e0\u5e8f\u7684\u952e\u503c\u5bf9\u96c6\u5408\u3002\u83b7\u53d6\u5b57\u5178\u7684\u6240\u6709\u952e\u901a\u5e38\u4f7f\u7528keys()\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u975e\u5e38\u9ad8\u6548\u3002\u5b83\u8fd4\u56de\u4e00\u4e2a\u89c6\u56fe\u5bf9\u8c61\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u63d0\u4f9b\u4e86\u4e00\u79cd\u52a8\u6001\u663e\u793a\u5b57\u5178\u952e\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u4f7f\u7528keys()\u65b9\u6cd5\u7684\u6700\u5927\u4f18\u52bf\u5728\u4e8e\u5176\u7b80\u5355\u6613\u7528\uff0c\u53ef\u4ee5\u5feb\u901f\u83b7\u53d6\u5b57\u5178\u7684\u6240\u6709\u952e\u3002\u8fd9\u5728\u9700\u8981\u5bf9\u5b57\u5178\u7684\u952e\u8fdb\u884c\u904d\u5386\u3001\u6bd4\u8f83\u6216\u5c06\u5176\u8f6c\u6362\u4e3a\u5217\u8868\u65f6\u5c24\u5176\u6709\u7528\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u57fa\u672c\u793a\u4f8b\uff1a<\/p>\n<\/p>\n

my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
keys = my_dict.keys()<\/p>\n
print(keys)  # dict_keys(['a', 'b', 'c'])<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u5f0f\u4e0d\u4ec5\u76f4\u89c2\uff0c\u800c\u4e14\u5728Python 3\u4e2d\uff0c\u8fd4\u56de\u7684\u89c6\u56fe\u5bf9\u8c61\u4f1a\u52a8\u6001\u53cd\u6620\u5b57\u5178\u7684\u53d8\u5316\uff0c\u56e0\u6b64\u66f4\u52a0\u7075\u6d3b\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u901a\u8fc7\u904d\u5386\u5b57\u5178\u6765\u83b7\u53d6<\/p>\n<\/p>\n
\u904d\u5386\u5b57\u5178\u4e5f\u662f\u83b7\u53d6\u952e\u7684\u4e00\u79cd\u5e38\u89c1\u65b9\u6cd5\uff0c\u5c24\u5176\u662f\u5728\u9700\u8981\u5bf9\u952e\u8fdb\u884c\u8fdb\u4e00\u6b65\u64cd\u4f5c\u6216\u5904\u7406\u65f6\u3002\u901a\u8fc7\u904d\u5386\u5b57\u5178\uff0c\u53ef\u4ee5\u9010\u4e2a\u83b7\u53d6\u6bcf\u4e2a\u952e\uff0c\u540c\u65f6\u8fd8\u80fd\u8bbf\u95ee\u5176\u5bf9\u5e94\u7684\u503c\u3002<\/p>\n<\/p>\n
\u904d\u5386\u5b57\u5178\u7684\u5178\u578b\u7528\u6cd5\u662f\u4f7f\u7528for\u5faa\u73af\uff0c\u8fd9\u79cd\u65b9\u6cd5\u4e0d\u4ec5\u80fd\u83b7\u53d6\u5230\u952e\uff0c\u8fd8\u80fd\u5bf9\u5176\u8fdb\u884c\u5904\u7406\u6216\u4e0e\u5176\u4ed6\u6570\u636e\u8fdb\u884c\u6bd4\u8f83\u3002\u8fd9\u79cd\u65b9\u5f0f\u5728\u5904\u7406\u590d\u6742\u6570\u636e\u7ed3\u6784\u65f6\u975e\u5e38\u6709\u7528\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
for key in my_dict:<\/p>\n
    print(key)  # Output: a, b, c<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u6bb5\u4ee3\u7801\u5c55\u793a\u4e86\u5982\u4f55\u901a\u8fc7for\u5faa\u73af\u904d\u5386\u5b57\u5178\u5e76\u83b7\u53d6\u6bcf\u4e2a\u952e\uff0c\u9002\u5408\u7528\u4e8e\u9700\u8981\u5bf9\u952e\u8fdb\u884c\u590d\u6742\u64cd\u4f5c\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528get()\u65b9\u6cd5\u6765\u5b89\u5168\u83b7\u53d6<\/p>\n<\/p>\n
\u4f7f\u7528get()\u65b9\u6cd5\u63d0\u4f9b\u4e86\u4e00\u79cd\u5b89\u5168\u83b7\u53d6\u5b57\u5178\u952e\u7684\u65b9\u6cd5\uff0c\u8fd9\u79cd\u65b9\u6cd5\u5c24\u5176\u9002\u5408\u4e8e\u9700\u8981\u786e\u4fdd\u952e\u5b58\u5728\u7684\u573a\u5408\u3002\u4e0e\u76f4\u63a5\u8bbf\u95ee\u5b57\u5178\u952e\u4e0d\u540c\uff0cget()\u65b9\u6cd5\u5728\u952e\u4e0d\u5b58\u5728\u65f6\u4e0d\u4f1a\u629b\u51fa\u5f02\u5e38\uff0c\u800c\u662f\u8fd4\u56de\u4e00\u4e2a\u9ed8\u8ba4\u503c\u3002<\/p>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u52bf\u5728\u4e8e\u5176\u5b89\u5168\u6027\uff0c\u7279\u522b\u662f\u5728\u5904\u7406\u4e0d\u786e\u5b9a\u6027\u8f83\u9ad8\u7684\u6570\u636e\u65f6\uff0c\u53ef\u4ee5\u907f\u514d\u56e0\u952e\u4e0d\u5b58\u5728\u800c\u5bfc\u81f4\u7684\u7a0b\u5e8f\u4e2d\u65ad\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
value = my_dict.get('d', 'Not Found')<\/p>\n
print(value)  # Output: Not Found<\/p>\n
<\/code><\/pre>\n<\/p>\n
get()\u65b9\u6cd5\u5141\u8bb8\u6307\u5b9a\u4e00\u4e2a\u9ed8\u8ba4\u8fd4\u56de\u503c\uff0c\u8fd9\u5728\u5904\u7406\u5b57\u5178\u952e\u65f6\u63d0\u4f9b\u4e86\u66f4\u5927\u7684\u7075\u6d3b\u6027\u548c\u5b89\u5168\u6027\u3002<\/p>\n<\/p>\n
\u56db\u3001\u901a\u8fc7\u5f02\u5e38\u5904\u7406\u6765\u83b7\u53d6<\/p>\n<\/p>\n
\u5f02\u5e38\u5904\u7406\u662f\u4e00\u79cd\u66f4\u9ad8\u7ea7\u7684\u83b7\u53d6\u5b57\u5178\u952e\u7684\u65b9\u6cd5\uff0c\u9002\u7528\u4e8e\u9700\u8981\u5bf9\u5b57\u5178\u8bbf\u95ee\u8fdb\u884c\u4e25\u5bc6\u63a7\u5236\u7684\u573a\u666f\u3002\u901a\u8fc7\u6355\u83b7KeyError\u5f02\u5e38\uff0c\u53ef\u4ee5\u5bf9\u4e0d\u5b58\u5728\u7684\u952e\u8fdb\u884c\u7279\u6b8a\u5904\u7406\u3002<\/p>\n<\/p>\n
\u8fd9\u79cd\u65b9\u5f0f\u7684\u4f18\u52bf\u5728\u4e8e\u5176\u7075\u6d3b\u6027\u548c\u53ef\u63a7\u6027\uff0c\u7279\u522b\u662f\u5728\u9700\u8981\u5bf9\u4e0d\u540c\u7684\u9519\u8bef\u8fdb\u884c\u4e0d\u540c\u5904\u7406\u65f6\uff0c\u5f02\u5e38\u5904\u7406\u63d0\u4f9b\u4e86\u66f4\u5927\u7684\u81ea\u7531\u5ea6\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
try:<\/p>\n
    value = my_dict['d']<\/p>\n
except KeyError:<\/p>\n
    print("Key not found")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u53ef\u4ee5\u5728\u4e0d\u5f71\u54cd\u7a0b\u5e8f\u6b63\u5e38\u8fd0\u884c\u7684\u60c5\u51b5\u4e0b\u5904\u7406\u4e0d\u5b58\u5728\u7684\u952e\uff0c\u5e76\u6839\u636e\u9700\u8981\u6267\u884c\u76f8\u5e94\u7684\u903b\u8f91\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u4f7f\u7528\u5b57\u5178\u63a8\u5bfc\u5f0f\u83b7\u53d6\u7279\u5b9a\u952e<\/p>\n<\/p>\n
\u5b57\u5178\u63a8\u5bfc\u5f0f\u662f\u4e00\u79cd\u7b80\u6d01\u4e14\u9ad8\u6548\u7684\u83b7\u53d6\u5b57\u5178\u4e2d\u7279\u5b9a\u952e\u7684\u65b9\u6cd5\u3002\u5728\u67d0\u4e9b\u573a\u666f\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u53ea\u9700\u8981\u5b57\u5178\u4e2d\u7b26\u5408\u67d0\u4e9b\u6761\u4ef6\u7684\u952e\u3002\u5b57\u5178\u63a8\u5bfc\u5f0f\u5141\u8bb8\u6211\u4eec\u5728\u4e00\u4e2a\u8868\u8fbe\u5f0f\u4e2d\u540c\u65f6\u8fdb\u884c\u952e\u7684\u8fc7\u6ee4\u548c\u83b7\u53d6\u3002<\/p>\n<\/p>\n
\u901a\u8fc7\u5b57\u5178\u63a8\u5bfc\u5f0f\uff0c\u53ef\u4ee5\u5feb\u901f\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u7279\u5b9a\u952e\u7684\u65b0\u5b57\u5178\uff0c\u8fd9\u79cd\u65b9\u6cd5\u65e2\u7b80\u6d01\u53c8\u9ad8\u6548\uff0c\u9002\u5408\u7528\u4e8e\u6570\u636e\u7b5b\u9009\u548c\u8f6c\u6362\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3, 'd': 4}<\/p>\n
filtered_keys = {key: my_dict[key] for key in my_dict if my_dict[key] > 2}<\/p>\n
print(filtered_keys)  # Output: {'c': 3, 'd': 4}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u7279\u522b\u9002\u5408\u7528\u4e8e\u9700\u8981\u5bf9\u5b57\u5178\u8fdb\u884c\u8fc7\u6ee4\u548c\u8f6c\u6362\u7684\u573a\u5408\uff0c\u901a\u8fc7\u7b80\u5355\u7684\u8868\u8fbe\u5f0f\u5b9e\u73b0\u590d\u6742\u7684\u6570\u636e\u5904\u7406\u903b\u8f91\u3002<\/p>\n<\/p>\n
\u516d\u3001\u901a\u8fc7\u5185\u7f6e\u51fd\u6570\u83b7\u53d6\u952e<\/p>\n<\/p>\n
Python\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5185\u7f6e\u51fd\u6570\u6765\u5e2e\u52a9\u6211\u4eec\u66f4\u9ad8\u6548\u5730\u64cd\u4f5c\u5b57\u5178\u3002\u5728\u83b7\u53d6\u5b57\u5178\u952e\u65f6\uff0c\u5185\u7f6e\u51fd\u6570\u5982filter()\u3001map()\u7b49\u53ef\u4ee5\u7ed3\u5408\u4f7f\u7528\uff0c\u7b80\u5316\u4ee3\u7801\u5e76\u63d0\u9ad8\u53ef\u8bfb\u6027\u3002<\/p>\n<\/p>\n
\u5185\u7f6e\u51fd\u6570\u7684\u4f18\u52bf\u5728\u4e8e\u5176\u9ad8\u6548\u6027\u548c\u53ef\u8bfb\u6027\uff0c\u7279\u522b\u662f\u5728\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u65f6\uff0c\u8fd9\u4e9b\u51fd\u6570\u80fd\u591f\u663e\u8457\u63d0\u5347\u7a0b\u5e8f\u6027\u80fd\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528filter()\u51fd\u6570\u7684\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
filtered_keys = list(filter(lambda key: my_dict[key] > 1, my_dict))<\/p>\n
print(filtered_keys)  # Output: ['b', 'c']<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u5185\u7f6e\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u4fdd\u6301\u4ee3\u7801\u7b80\u6d01\u7684\u540c\u65f6\u5b9e\u73b0\u590d\u6742\u7684\u6570\u636e\u5904\u7406\u903b\u8f91\uff0c\u7279\u522b\u9002\u5408\u7528\u4e8e\u9700\u8981\u9ad8\u6548\u5904\u7406\u5927\u91cf\u6570\u636e\u7684\u573a\u5408\u3002<\/p>\n<\/p>\n
\u4e03\u3001\u4f7f\u7528collections\u6a21\u5757\u4e2d\u7684OrderedDict<\/p>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u7ef4\u62a4\u5b57\u5178\u952e\u7684\u987a\u5e8f\u3002\u8fd9\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528collections\u6a21\u5757\u4e2d\u7684OrderedDict\u3002OrderedDict\u662fPython\u6807\u51c6\u5e93\u7684\u4e00\u90e8\u5206\uff0c\u5b83\u53ef\u4ee5\u4fdd\u8bc1\u5b57\u5178\u7684\u952e\u6309\u63d2\u5165\u987a\u5e8f\u6392\u5217\u3002<\/p>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u52bf\u5728\u4e8e\u5176\u80fd\u7ef4\u62a4\u952e\u7684\u987a\u5e8f\uff0c\u7279\u522b\u9002\u5408\u7528\u4e8e\u9700\u8981\u6309\u987a\u5e8f\u5904\u7406\u952e\u503c\u5bf9\u7684\u573a\u5408\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
from collections import OrderedDict<\/p>\n
ordered_dict = OrderedDict()<\/p>\n
ordered_dict['a'] = 1<\/p>\n
ordered_dict['b'] = 2<\/p>\n
ordered_dict['c'] = 3<\/p>\n
for key in ordered_dict:<\/p>\n
    print(key)  # Output: a, b, c<\/p>\n
<\/code><\/pre>\n<\/p>\n
OrderedDict\u4e0d\u4ec5\u63d0\u4f9b\u4e86\u4e0e\u666e\u901a\u5b57\u5178\u76f8\u540c\u7684\u63a5\u53e3\uff0c\u8fd8\u589e\u52a0\u4e86\u7ef4\u62a4\u952e\u987a\u5e8f\u7684\u529f\u80fd\uff0c\u662f\u5904\u7406\u6709\u5e8f\u6570\u636e\u7684\u7406\u60f3\u9009\u62e9\u3002<\/p>\n<\/p>\n
\u516b\u3001\u4f7f\u7528pandas\u5e93\u5904\u7406\u5b57\u5178<\/p>\n<\/p>\n
\u5bf9\u4e8e\u9700\u8981\u8fdb\u884c\u6570\u636e\u5206\u6790\u7684\u573a\u5408\uff0cpandas\u5e93\u63d0\u4f9b\u4e86\u5f3a\u5927\u7684\u5de5\u5177\u6765\u5904\u7406\u5b57\u5178\u3002\u901a\u8fc7\u5c06\u5b57\u5178\u8f6c\u6362\u4e3aDataFrame\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u8fdb\u884c\u6570\u636e\u5206\u6790\u548c\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
pandas\u5e93\u7684\u4f18\u52bf\u5728\u4e8e\u5176\u5f3a\u5927\u7684\u6570\u636e\u5904\u7406\u80fd\u529b\uff0c\u7279\u522b\u9002\u5408\u7528\u4e8e\u9700\u8981\u8fdb\u884c\u590d\u6742\u6570\u636e\u5206\u6790\u548c\u5904\u7406\u7684\u573a\u5408\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
import pandas as pd<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
df = pd.DataFrame(list(my_dict.items()), columns=['Key', 'Value'])<\/p>\n
print(df)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7pandas\u5e93\uff0c\u6211\u4eec\u53ef\u4ee5\u65b9\u4fbf\u5730\u5c06\u5b57\u5178\u8f6c\u6362\u4e3aDataFrame\u8fdb\u884c\u5206\u6790\uff0c\u9002\u5408\u7528\u4e8e\u9700\u8981\u8fdb\u884c\u6570\u636e\u5206\u6790\u7684\u573a\u5408\u3002<\/p>\n<\/p>\n
\u4e5d\u3001\u4f7f\u7528JSON\u683c\u5f0f\u5b58\u50a8\u548c\u83b7\u53d6\u952e<\/p>\n<\/p>\n
\u5728\u9700\u8981\u6301\u4e45\u5316\u5b58\u50a8\u5b57\u5178\u6570\u636e\u65f6\uff0cJSON\u683c\u5f0f\u662f\u4e00\u79cd\u5e38\u7528\u9009\u62e9\u3002\u901a\u8fc7\u5c06\u5b57\u5178\u8f6c\u6362\u4e3aJSON\u5b57\u7b26\u4e32\uff0c\u53ef\u4ee5\u65b9\u4fbf\u5730\u8fdb\u884c\u5b58\u50a8\u548c\u4f20\u8f93\uff0c\u5e76\u5728\u9700\u8981\u65f6\u91cd\u65b0\u52a0\u8f7d\u3002<\/p>\n<\/p>\n
JSON\u683c\u5f0f\u7684\u4f18\u52bf\u5728\u4e8e\u5176\u901a\u7528\u6027\u548c\u6613\u4e8e\u4f20\u8f93\uff0c\u7279\u522b\u9002\u5408\u7528\u4e8e\u9700\u8981\u8de8\u5e73\u53f0\u5b58\u50a8\u548c\u4f20\u8f93\u6570\u636e\u7684\u573a\u5408\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
import json<\/p>\n
my_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
json_str = json.dumps(my_dict)<\/p>\n
loaded_dict = json.loads(json_str)<\/p>\n
print(loaded_dict.keys())  # Output: dict_keys(['a', 'b', 'c'])<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7JSON\u683c\u5f0f\uff0c\u6211\u4eec\u53ef\u4ee5\u65b9\u4fbf\u5730\u5b58\u50a8\u548c\u4f20\u8f93\u5b57\u5178\u6570\u636e\uff0c\u5e76\u5728\u9700\u8981\u65f6\u91cd\u65b0\u52a0\u8f7d\uff0c\u9002\u5408\u7528\u4e8e\u9700\u8981\u8de8\u5e73\u53f0\u6570\u636e\u4f20\u8f93\u7684\u573a\u5408\u3002<\/p>\n<\/p>\n
\u5341\u3001\u603b\u7ed3<\/p>\n<\/p>\n
\u5728Python\u4e2d\u83b7\u53d6\u5b57\u5178\u952e\u7684\u65b9\u6cd5\u591a\u79cd\u591a\u6837\uff0c\u4ece\u57fa\u7840\u7684keys()\u65b9\u6cd5\u5230\u9ad8\u7ea7\u7684\u5f02\u5e38\u5904\u7406\u548c\u6570\u636e\u5206\u6790\u5e93\uff0c\u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u72ec\u7279\u7684\u4f18\u52bf\u548c\u9002\u7528\u573a\u666f\u3002\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\uff0c\u4e0d\u4ec5\u80fd\u63d0\u9ad8\u4ee3\u7801\u7684\u6548\u7387\u548c\u53ef\u8bfb\u6027\uff0c\u8fd8\u80fd\u5728\u590d\u6742\u6570\u636e\u5904\u7406\u4e2d\u63d0\u4f9b\u66f4\u5927\u7684\u7075\u6d3b\u6027\u3002\u65e0\u8bba\u662f\u7b80\u5355\u7684\u6570\u636e\u63d0\u53d6\uff0c\u8fd8\u662f\u590d\u6742\u7684\u6570\u636e\u5206\u6790\u548c\u5904\u7406\uff0cPython\u90fd\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u5de5\u5177\u548c\u65b9\u6cd5\u6765\u6ee1\u8db3\u4e0d\u540c\u7684\u9700\u6c42\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\u6765\u83b7\u53d6\u6240\u6709\u7684\u952e\u3002\u8fd9\u5c06\u8fd4\u56de\u4e00\u4e2a\u53ef\u8fed\u4ee3\u7684\u89c6\u56fe\u5bf9\u8c61\uff0c\u5305\u542b\u5b57\u5178\u4e2d\u6240\u6709\u7684\u952e\u3002\u4f8b\u5982\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
\u5982\u679c\u9700\u8981\u5c06\u8fd9\u4e9b\u952e\u8f6c\u6362\u4e3a\u5217\u8868\uff0c\u53ef\u4ee5\u4f7f\u7528list()<\/code>\u51fd\u6570\uff1a  <\/p>\n
keys_list = list(my_dict.keys())\nprint(keys_list)  # \u8f93\u51fa: ['name', 'age', 'city']\n<\/code><\/pre>\n
\u5982\u4f55\u5224\u65ad\u4e00\u4e2a\u7279\u5b9a\u7684\u952e\u662f\u5426\u5b58\u5728\u4e8e\u5b57\u5178\u4e2d\uff1f<\/strong>
\u53ef\u4ee5\u4f7f\u7528in<\/code>\u8fd0\u7b97\u7b26\u6765\u5224\u65ad\u4e00\u4e2a\u952e\u662f\u5426\u5b58\u5728\u4e8e\u5b57\u5178\u4e2d\u3002\u4f8b\u5982\uff1a  <\/p>\n
if 'age' in my_dict:\n    print("\u952e 'age' \u5b58\u5728\u4e8e\u5b57\u5178\u4e2d")\nelse:\n    print("\u952e 'age' \u4e0d\u5b58\u5728\u4e8e\u5b57\u5178\u4e2d")\n<\/code><\/pre>\n
\u8fd9\u79cd\u65b9\u6cd5\u975e\u5e38\u9ad8\u6548\uff0c\u9002\u5408\u5728\u5904\u7406\u5927\u5b57\u5178\u65f6\u4f7f\u7528\u3002<\/p>\n
\u5982\u4f55\u5728Python\u4e2d\u904d\u5386\u5b57\u5178\u7684\u952e\uff1f<\/strong>
\u904d\u5386\u5b57\u5178\u7684\u952e\u53ef\u4ee5\u4f7f\u7528for<\/code>\u5faa\u73af\u914d\u5408keys()<\/code>\u65b9\u6cd5\u3002\u8fd9\u6837\u53ef\u4ee5\u5bf9\u6bcf\u4e00\u4e2a\u952e\u6267\u884c\u76f8\u5173\u64cd\u4f5c\u3002\u4f8b\u5982\uff1a  <\/p>\n
for key in my_dict.keys():\n    print(key)  # \u5c06\u9010\u4e2a\u6253\u5370\u51fa\u5b57\u5178\u4e2d\u7684\u6bcf\u4e2a\u952e\n<\/code><\/pre>\n
\u4e5f\u53ef\u4ee5\u76f4\u63a5\u5728for<\/code>\u5faa\u73af\u4e2d\u904d\u5386\u5b57\u5178\uff0c\u56e0\u4e3a\u904d\u5386\u5b57\u5178\u65f6\u9ed8\u8ba4\u4f1a\u904d\u5386\u5176\u952e\uff1a  <\/p>\n
for key in my_dict:\n    print(key)  # \u8fd9\u5c06\u5f97\u5230\u4e0e\u4e0a\u9762\u76f8\u540c\u7684\u7ed3\u679c\n<\/code><\/pre>\n
\u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\u53ef\u4ee5\u8ba9\u4ee3\u7801\u66f4\u7b80\u6d01\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python\u5982\u4f55\u83b7\u53d6key\uff1a\u5728Python\u4e2d\u83b7\u53d6key\u7684\u5e38\u7528\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528\u5b57\u5178\u7684keys()\u65b9\u6cd5\u3001\u901a\u8fc7\u904d\u5386\u5b57\u5178\u6765 […]","protected":false},"author":3,"featured_media":946943,"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\/946940"}],"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=946940"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/946940\/revisions"}],"predecessor-version":[{"id":946945,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/946940\/revisions\/946945"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/946943"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=946940"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=946940"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=946940"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}