{"id":1038202,"date":"2024-12-31T12:21:49","date_gmt":"2024-12-31T04:21:49","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1038202.html"},"modified":"2024-12-31T12:21:51","modified_gmt":"2024-12-31T04:21:51","slug":"python%e5%a6%82%e4%bd%95%e8%af%bb%e5%8f%96%e5%ad%97%e5%85%b8%e4%b8%ad%e7%9a%84%e5%80%bc","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1038202.html","title":{"rendered":"python\u5982\u4f55\u8bfb\u53d6\u5b57\u5178\u4e2d\u7684\u503c"},"content":{"rendered":"

\"python\u5982\u4f55\u8bfb\u53d6\u5b57\u5178\u4e2d\u7684\u503c\"<\/p>\n

Python\u8bfb\u53d6\u5b57\u5178\u4e2d\u7684\u503c\u6709\u591a\u79cd\u65b9\u6cd5\uff0c\u5305\u62ec\u4f7f\u7528\u952e\u3001get()\u65b9\u6cd5\u3001items()\u65b9\u6cd5\u7b49\u3002<\/strong> \u5728\u5b9e\u9645\u4f7f\u7528\u4e2d\uff0c\u6700\u5e38\u7528\u7684\u662f\u901a\u8fc7\u952e\u76f4\u63a5\u8bbf\u95ee\u548c\u4f7f\u7528get()\u65b9\u6cd5\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u5c55\u5f00\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u4ee5\u53ca\u5b83\u4eec\u5404\u81ea\u7684\u4f18\u7f3a\u70b9\u548c\u9002\u7528\u573a\u666f\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u901a\u8fc7\u952e\u76f4\u63a5\u8bbf\u95ee<\/h2>\n<\/p>\n

Python\u5b57\u5178\u4e2d\u7684\u503c\u662f\u901a\u8fc7\u952e\u6765\u8fdb\u884c\u8bbf\u95ee\u7684\u3002\u952e\u5fc5\u987b\u662f\u552f\u4e00\u7684\uff0c\u800c\u4e14\u901a\u5e38\u662f\u4e0d\u53ef\u53d8\u7684\u7c7b\u578b\uff08\u4f8b\u5982\u5b57\u7b26\u4e32\u3001\u6574\u6570\u3001\u5143\u7ec4\uff09\u3002\u901a\u8fc7\u952e\u76f4\u63a5\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\u662f\u6700\u5e38\u89c1\u548c\u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

# \u793a\u4f8b\u5b57\u5178<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
\u901a\u8fc7\u952e\u76f4\u63a5\u8bbf\u95ee<\/strong><\/h2>\n
name = my_dict['name']<\/p>\n
age = my_dict['age']<\/p>\n
city = my_dict['city']<\/p>\n
print(f"Name: {name}, Age: {age}, City: {city}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1a<\/h3>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u7b80\u5355\u76f4\u89c2\uff0c\u8bbf\u95ee\u901f\u5ea6\u5feb\u3002\u7f3a\u70b9\u662f\u5982\u679c\u952e\u4e0d\u5b58\u5728\uff0c\u4f1a\u629b\u51faKeyError\u5f02\u5e38\u3002\u56e0\u6b64\uff0c\u5728\u4f7f\u7528\u8fd9\u79cd\u65b9\u6cd5\u65f6\uff0c\u5fc5\u987b\u786e\u4fdd\u952e\u4e00\u5b9a\u5b58\u5728\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528get()\u65b9\u6cd5<\/h2>\n<\/p>\n
get()\u65b9\u6cd5\u662f\u5b57\u5178\u63d0\u4f9b\u7684\u4e00\u4e2a\u5185\u7f6e\u65b9\u6cd5\uff0c\u7528\u4e8e\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\u3002\u4e0e\u76f4\u63a5\u901a\u8fc7\u952e\u8bbf\u95ee\u4e0d\u540c\u7684\u662f\uff0cget()\u65b9\u6cd5\u5728\u952e\u4e0d\u5b58\u5728\u65f6\u4e0d\u4f1a\u629b\u51fa\u5f02\u5e38\uff0c\u800c\u662f\u8fd4\u56deNone\uff08\u6216\u4e00\u4e2a\u6307\u5b9a\u7684\u9ed8\u8ba4\u503c\uff09\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u5b57\u5178<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
\u4f7f\u7528get()\u65b9\u6cd5\u8bbf\u95ee<\/strong><\/h2>\n
name = my_dict.get('name')<\/p>\n
age = my_dict.get('age')<\/p>\n
country = my_dict.get('country', 'Unknown')<\/p>\n
print(f"Name: {name}, Age: {age}, Country: {country}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1a<\/h3>\n<\/p>\n
\u4f7f\u7528get()\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u66f4\u52a0\u5b89\u5168\uff0c\u53ef\u4ee5\u907f\u514dKeyError\u5f02\u5e38\uff0c\u8fd8\u53ef\u4ee5\u63d0\u4f9b\u9ed8\u8ba4\u503c\u3002\u7f3a\u70b9\u662f\u4e0e\u76f4\u63a5\u901a\u8fc7\u952e\u8bbf\u95ee\u76f8\u6bd4\uff0c\u4ee3\u7801\u7a0d\u5fae\u590d\u6742\u4e00\u4e9b\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528items()\u65b9\u6cd5<\/h2>\n<\/p>\n
items()\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u6240\u6709\u952e\u503c\u5bf9\u7684\u89c6\u56fe\u5bf9\u8c61\uff0c\u53ef\u4ee5\u901a\u8fc7\u904d\u5386\u8fd9\u4e2a\u5bf9\u8c61\u6765\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u5b57\u5178<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
\u4f7f\u7528items()\u65b9\u6cd5\u904d\u5386\u8bbf\u95ee<\/strong><\/h2>\n
for key, value in my_dict.items():<\/p>\n
    print(f"{key}: {value}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1a<\/h3>\n<\/p>\n
\u4f7f\u7528items()\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u53ef\u4ee5\u65b9\u4fbf\u5730\u904d\u5386\u5b57\u5178\u4e2d\u7684\u6240\u6709\u952e\u503c\u5bf9\uff0c\u9002\u7528\u4e8e\u9700\u8981\u5bf9\u5b57\u5178\u8fdb\u884c\u6574\u4f53\u64cd\u4f5c\u7684\u573a\u666f\u3002\u7f3a\u70b9\u662f\u5728\u53ea\u9700\u8981\u8bbf\u95ee\u5355\u4e2a\u503c\u65f6\u663e\u5f97\u4e0d\u591f\u9ad8\u6548\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528keys()\u65b9\u6cd5\u548cvalues()\u65b9\u6cd5<\/h2>\n<\/p>\n
keys()\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u5b57\u5178\u4e2d\u6240\u6709\u952e\u7684\u89c6\u56fe\u5bf9\u8c61\uff0cvalues()\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u5b57\u5178\u4e2d\u6240\u6709\u503c\u7684\u89c6\u56fe\u5bf9\u8c61\u3002\u53ef\u4ee5\u7ed3\u5408\u8fd9\u4e9b\u65b9\u6cd5\u6765\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u5b57\u5178<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
\u4f7f\u7528keys()\u65b9\u6cd5\u548cvalues()\u65b9\u6cd5<\/strong><\/h2>\n
keys = my_dict.keys()<\/p>\n
values = my_dict.values()<\/p>\n
print(f"Keys: {list(keys)}")<\/p>\n
print(f"Values: {list(values)}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1a<\/h3>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u83b7\u53d6\u6240\u6709\u952e\u6216\u6240\u6709\u503c\u7684\u573a\u666f\uff0c\u4f46\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u7ed3\u5408items()\u65b9\u6cd5\u66f4\u4e3a\u5e38\u89c1\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u4f7f\u7528setdefault()\u65b9\u6cd5<\/h2>\n<\/p>\n
setdefault()\u65b9\u6cd5\u5728\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\u65f6\uff0c\u5982\u679c\u952e\u4e0d\u5b58\u5728\uff0c\u5219\u4f1a\u5c06\u8be5\u952e\u6dfb\u52a0\u5230\u5b57\u5178\u4e2d\uff0c\u5e76\u5c06\u5176\u503c\u8bbe\u7f6e\u4e3a\u6307\u5b9a\u7684\u9ed8\u8ba4\u503c\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u5b57\u5178<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
\u4f7f\u7528setdefault()\u65b9\u6cd5<\/strong><\/h2>\n
country = my_dict.setdefault('country', 'Unknown')<\/p>\n
print(f"Country: {country}")<\/p>\n
print(f"Updated dictionary: {my_dict}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1a<\/h3>\n<\/p>\n
\u4f7f\u7528setdefault()\u65b9\u6cd5\u7684\u4f18\u70b9\u662f\u5728\u8bbf\u95ee\u503c\u7684\u540c\u65f6\u53ef\u4ee5\u66f4\u65b0\u5b57\u5178\uff0c\u9002\u7528\u4e8e\u9700\u8981\u9ed8\u8ba4\u503c\u4e14\u5e0c\u671b\u66f4\u65b0\u5b57\u5178\u7684\u573a\u666f\u3002\u7f3a\u70b9\u662f\u4f1a\u5bf9\u5b57\u5178\u8fdb\u884c\u4fee\u6539\uff0c\u4e0d\u9002\u7528\u4e8e\u53ea\u8bfb\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
\u516d\u3001\u901a\u8fc7\u5b57\u5178\u63a8\u5bfc\u5f0f\u8bbf\u95ee<\/h2>\n<\/p>\n
\u5b57\u5178\u63a8\u5bfc\u5f0f\uff08dictionary comprehension\uff09\u662f\u4e00\u79cd\u7b80\u6d01\u7684\u65b9\u5f0f\uff0c\u53ef\u4ee5\u5728\u8bbf\u95ee\u5b57\u5178\u503c\u7684\u540c\u65f6\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b57\u5178\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u5b57\u5178<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
\u4f7f\u7528\u5b57\u5178\u63a8\u5bfc\u5f0f<\/strong><\/h2>\n
new_dict = {k: v for k, v in my_dict.items() if v != 'New York'}<\/p>\n
print(f"Filtered dictionary: {new_dict}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1a<\/h3>\n<\/p>\n
\u5b57\u5178\u63a8\u5bfc\u5f0f\u7684\u4f18\u70b9\u662f\u7b80\u6d01\u9ad8\u6548\uff0c\u9002\u7528\u4e8e\u9700\u8981\u5728\u8bbf\u95ee\u503c\u7684\u540c\u65f6\u5bf9\u5b57\u5178\u8fdb\u884c\u8fc7\u6ee4\u6216\u8f6c\u6362\u7684\u573a\u666f\u3002\u7f3a\u70b9\u662f\u53ef\u8bfb\u6027\u76f8\u5bf9\u8f83\u4f4e\uff0c\u4e0d\u9002\u5408\u590d\u6742\u7684\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
\u4e03\u3001\u7ed3\u5408\u6761\u4ef6\u8868\u8fbe\u5f0f\u8bbf\u95ee<\/h2>\n<\/p>\n
\u5728\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\u65f6\uff0c\u53ef\u4ee5\u7ed3\u5408\u6761\u4ef6\u8868\u8fbe\u5f0f\uff08\u5982if-else\uff09\u8fdb\u884c\u5224\u65ad\uff0c\u6765\u5b9e\u73b0\u66f4\u7075\u6d3b\u7684\u8bbf\u95ee\u63a7\u5236\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u5b57\u5178<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
\u7ed3\u5408\u6761\u4ef6\u8868\u8fbe\u5f0f\u8bbf\u95ee<\/strong><\/h2>\n
age = my_dict['age'] if 'age' in my_dict else 'Unknown'<\/p>\n
print(f"Age: {age}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1a<\/h3>\n<\/p>\n
\u7ed3\u5408\u6761\u4ef6\u8868\u8fbe\u5f0f\u8bbf\u95ee\u7684\u4f18\u70b9\u662f\u7075\u6d3b\u6027\u9ad8\uff0c\u9002\u7528\u4e8e\u9700\u8981\u6839\u636e\u7279\u5b9a\u6761\u4ef6\u8fdb\u884c\u8bbf\u95ee\u63a7\u5236\u7684\u573a\u666f\u3002\u7f3a\u70b9\u662f\u4ee3\u7801\u76f8\u5bf9\u590d\u6742\uff0c\u9700\u8981\u4ed4\u7ec6\u5904\u7406\u6761\u4ef6\u5224\u65ad\u3002<\/p>\n<\/p>\n
\u516b\u3001\u4f7f\u7528\u5f02\u5e38\u5904\u7406\u673a\u5236\u8bbf\u95ee<\/h2>\n<\/p>\n
\u5728\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\u65f6\uff0c\u53ef\u4ee5\u7ed3\u5408\u5f02\u5e38\u5904\u7406\u673a\u5236\uff08try-except\uff09\u6765\u6355\u83b7\u548c\u5904\u7406\u53ef\u80fd\u51fa\u73b0\u7684KeyError\u5f02\u5e38\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u5b57\u5178<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
\u4f7f\u7528\u5f02\u5e38\u5904\u7406\u673a\u5236\u8bbf\u95ee<\/strong><\/h2>\n
try:<\/p>\n
    country = my_dict['country']<\/p>\n
except KeyError:<\/p>\n
    country = 'Unknown'<\/p>\n
print(f"Country: {country}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1a<\/h3>\n<\/p>\n
\u4f7f\u7528\u5f02\u5e38\u5904\u7406\u673a\u5236\u8bbf\u95ee\u7684\u4f18\u70b9\u662f\u53ef\u4ee5\u4f18\u96c5\u5730\u5904\u7406\u4e0d\u5b58\u5728\u7684\u952e\uff0c\u907f\u514d\u7a0b\u5e8f\u5d29\u6e83\u3002\u7f3a\u70b9\u662f\u4ee3\u7801\u7a0d\u663e\u5197\u957f\uff0c\u9002\u7528\u4e8e\u9700\u8981\u6355\u83b7\u548c\u5904\u7406\u5f02\u5e38\u7684\u573a\u666f\u3002<\/p>\n<\/p>\n
\u4e5d\u3001\u901a\u8fc7\u5b57\u5178\u5d4c\u5957\u8bbf\u95ee<\/h2>\n<\/p>\n
\u5728\u5904\u7406\u5d4c\u5957\u5b57\u5178\uff08\u5b57\u5178\u4e2d\u7684\u503c\u4e5f\u662f\u5b57\u5178\uff09\u65f6\uff0c\u53ef\u4ee5\u9010\u5c42\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u5d4c\u5957\u5b57\u5178<\/p>\n
nested_dict = {<\/p>\n
    'person': {<\/p>\n
        'name': 'Alice',<\/p>\n
        'detAI<\/a>ls': {<\/p>\n
            'age': 25,<\/p>\n
            'city': 'New York'<\/p>\n
        }<\/p>\n
    }<\/p>\n
}<\/p>\n
\u9010\u5c42\u8bbf\u95ee\u5d4c\u5957\u5b57\u5178\u4e2d\u7684\u503c<\/strong><\/h2>\n
name = nested_dict['person']['name']<\/p>\n
age = nested_dict['person']['details']['age']<\/p>\n
city = nested_dict['person']['details']['city']<\/p>\n
print(f"Name: {name}, Age: {age}, City: {city}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1a<\/h3>\n<\/p>\n
\u901a\u8fc7\u5b57\u5178\u5d4c\u5957\u8bbf\u95ee\u7684\u4f18\u70b9\u662f\u53ef\u4ee5\u5904\u7406\u590d\u6742\u7684\u5d4c\u5957\u7ed3\u6784\uff0c\u9002\u7528\u4e8e\u9700\u8981\u5904\u7406\u591a\u5c42\u5d4c\u5957\u6570\u636e\u7684\u573a\u666f\u3002\u7f3a\u70b9\u662f\u4ee3\u7801\u8f83\u4e3a\u590d\u6742\uff0c\u9700\u8981\u9010\u5c42\u8bbf\u95ee\u3002<\/p>\n<\/p>\n
\u5341\u3001\u7ed3\u5408\u51fd\u6570\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c<\/h2>\n<\/p>\n
\u53ef\u4ee5\u7f16\u5199\u81ea\u5b9a\u4e49\u51fd\u6570\u6765\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\uff0c\u4f7f\u4ee3\u7801\u66f4\u52a0\u6a21\u5757\u5316\u548c\u53ef\u91cd\u7528\u3002<\/p>\n<\/p>\n
# \u793a\u4f8b\u5b57\u5178<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
\u81ea\u5b9a\u4e49\u51fd\u6570\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c<\/strong><\/h2>\n
def get_dict_value(d, key, default=None):<\/p>\n
    return d.get(key, default)<\/p>\n
name = get_dict_value(my_dict, 'name')<\/p>\n
age = get_dict_value(my_dict, 'age')<\/p>\n
country = get_dict_value(my_dict, 'country', 'Unknown')<\/p>\n
print(f"Name: {name}, Age: {age}, Country: {country}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1a<\/h3>\n<\/p>\n
\u7ed3\u5408\u51fd\u6570\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\u7684\u4f18\u70b9\u662f\u4ee3\u7801\u66f4\u52a0\u6a21\u5757\u5316\u548c\u53ef\u91cd\u7528\uff0c\u9002\u7528\u4e8e\u9700\u8981\u591a\u6b21\u8bbf\u95ee\u5b57\u5178\u503c\u7684\u573a\u666f\u3002\u7f3a\u70b9\u662f\u9700\u8981\u989d\u5916\u7f16\u5199\u51fd\u6570\uff0c\u589e\u52a0\u4e86\u4ee3\u7801\u91cf\u3002<\/p>\n<\/p>\n
\u603b\u7ed3<\/h2>\n<\/p>\n
Python\u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u6cd5\u6765\u8bfb\u53d6\u5b57\u5178\u4e2d\u7684\u503c\uff0c\u5305\u62ec\u901a\u8fc7\u952e\u76f4\u63a5\u8bbf\u95ee\u3001\u4f7f\u7528get()\u65b9\u6cd5\u3001items()\u65b9\u6cd5\u3001keys()\u65b9\u6cd5\u3001values()\u65b9\u6cd5\u3001setdefault()\u65b9\u6cd5\u3001\u5b57\u5178\u63a8\u5bfc\u5f0f\u3001\u6761\u4ef6\u8868\u8fbe\u5f0f\u3001\u5f02\u5e38\u5904\u7406\u673a\u5236\u3001\u5b57\u5178\u5d4c\u5957\u8bbf\u95ee\u4ee5\u53ca\u7ed3\u5408\u51fd\u6570\u8bbf\u95ee\u7b49\u3002\u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u4f18\u7f3a\u70b9\u548c\u9002\u7528\u573a\u666f\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u3001\u9ad8\u6548\u548c\u5b89\u5168\u3002<\/p>\n<\/p>\n
\u901a\u8fc7\u4ee5\u4e0a\u4ecb\u7ecd\uff0c\u76f8\u4fe1\u4f60\u5df2\u7ecf\u638c\u63e1\u4e86\u591a\u79cdPython\u8bfb\u53d6\u5b57\u5178\u4e2d\u503c\u7684\u65b9\u6cd5\uff0c\u5e76\u80fd\u591f\u6839\u636e\u5b9e\u9645\u9700\u6c42\u9009\u62e9\u6700\u5408\u9002\u7684\u65b9\u6cd5\u8fdb\u884c\u64cd\u4f5c\u3002\u5e0c\u671b\u8fd9\u4e9b\u5185\u5bb9\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff0c\u80fd\u591f\u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\u7075\u6d3b\u5e94\u7528\uff0c\u63d0\u5347\u4ee3\u7801\u8d28\u91cf\u548c\u7f16\u7a0b\u6548\u7387\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u83b7\u53d6\u5b57\u5178\u7684\u7279\u5b9a\u503c\uff1f<\/strong>
\u8981\u83b7\u53d6Python\u5b57\u5178\u4e2d\u7684\u7279\u5b9a\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528\u952e\u4f5c\u4e3a\u7d22\u5f15\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u6709\u4e00\u4e2a\u5b57\u5178my_dict = {'name': 'Alice', 'age': 25}<\/code>\uff0c\u8981\u83b7\u53d6name<\/code>\u7684\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528my_dict['name']<\/code>\uff0c\u8fd4\u56de\u7ed3\u679c\u4e3a'Alice'<\/code>\u3002\u5982\u679c\u5c1d\u8bd5\u8bbf\u95ee\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\u952e\uff0c\u5c06\u4f1a\u629b\u51faKeyError<\/code>\uff0c\u53ef\u4ee5\u4f7f\u7528get()<\/code>\u65b9\u6cd5\u6765\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0cmy_dict.get('name')<\/code>\u5c06\u8fd4\u56de'Alice'<\/code>\uff0c\u800cmy_dict.get('nonexistent_key')<\/code>\u5c06\u8fd4\u56deNone<\/code>\u3002<\/p>\n
\u5728\u5b57\u5178\u4e2d\u5982\u4f55\u68c0\u67e5\u67d0\u4e2a\u952e\u662f\u5426\u5b58\u5728\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u6765\u68c0\u67e5\u67d0\u4e2a\u952e\u662f\u5426\u5b58\u5728\u4e8e\u5b57\u5178\u4e2d\u3002\u4f8b\u5982\uff0c\u4f7f\u7528'age' in my_dict<\/code>\u5c06\u8fd4\u56deTrue<\/code>\uff0c\u5982\u679c\u5b57\u5178\u4e2d\u6709\u8fd9\u4e2a\u952e\u3002\u8fd9\u6837\u53ef\u4ee5\u907f\u514d\u5728\u5c1d\u8bd5\u8bbf\u95ee\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\u952e\u65f6\u53d1\u751f\u9519\u8bef\u3002<\/p>\n
\u5982\u4f55\u904d\u5386\u5b57\u5178\u4ee5\u83b7\u53d6\u6240\u6709\u952e\u548c\u503c\uff1f<\/strong>
\u53ef\u4ee5\u4f7f\u7528items()<\/code>\u65b9\u6cd5\u6765\u904d\u5386\u5b57\u5178\u4e2d\u7684\u6240\u6709\u952e\u548c\u503c\u3002\u901a\u8fc7for key, value in my_dict.items():<\/code>\u7684\u5f62\u5f0f\uff0c\u53ef\u4ee5\u9010\u4e00\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u6bcf\u4e2a\u952e\u503c\u5bf9\u3002\u8fd9\u79cd\u65b9\u5f0f\u975e\u5e38\u9002\u5408\u9700\u8981\u5bf9\u6bcf\u4e2a\u952e\u503c\u5bf9\u6267\u884c\u64cd\u4f5c\u7684\u573a\u666f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python\u8bfb\u53d6\u5b57\u5178\u4e2d\u7684\u503c\u6709\u591a\u79cd\u65b9\u6cd5\uff0c\u5305\u62ec\u4f7f\u7528\u952e\u3001get()\u65b9\u6cd5\u3001items()\u65b9\u6cd5\u7b49\u3002 \u5728\u5b9e\u9645\u4f7f\u7528\u4e2d\uff0c\u6700\u5e38\u7528 […]","protected":false},"author":3,"featured_media":1038205,"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\/1038202"}],"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=1038202"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1038202\/revisions"}],"predecessor-version":[{"id":1038207,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1038202\/revisions\/1038207"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1038205"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1038202"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1038202"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1038202"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}