{"id":1185909,"date":"2025-01-15T19:46:30","date_gmt":"2025-01-15T11:46:30","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1185909.html"},"modified":"2025-01-15T19:46:33","modified_gmt":"2025-01-15T11:46:33","slug":"python%e4%b8%ad%e5%ad%97%e5%85%b8%e5%a6%82%e4%bd%95%e5%88%a4%e6%96%ad%e5%8c%85%e5%90%ab","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1185909.html","title":{"rendered":"python\u4e2d\u5b57\u5178\u5982\u4f55\u5224\u65ad\u5305\u542b"},"content":{"rendered":"

\"python\u4e2d\u5b57\u5178\u5982\u4f55\u5224\u65ad\u5305\u542b\"<\/p>\n

\u5728Python\u4e2d\uff0c\u5224\u65ad\u5b57\u5178\u662f\u5426\u5305\u542b\u67d0\u4e2a\u952e\u6216\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u3001get<\/code>\u65b9\u6cd5\u3001keys()<\/code>\u65b9\u6cd5\u3001values()<\/code>\u65b9\u6cd5\u3001items()<\/code>\u65b9\u6cd5\u3002<\/strong>\u5728\u8fd9\u4e9b\u65b9\u6cd5\u4e2d\uff0c\u6700\u5e38\u7528\u548c\u76f4\u63a5\u7684\u5c31\u662f\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u3002\u901a\u8fc7\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\uff0c\u4f60\u53ef\u4ee5\u8f7b\u677e\u5730\u68c0\u67e5\u5b57\u5178\u662f\u5426\u5305\u542b\u67d0\u4e2a\u7279\u5b9a\u7684\u952e\u3002\u4f8b\u5982\uff1a<\/strong><\/p>\n<\/p>\n

my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
if 'name' in my_dict:<\/p>\n
    print("\u952e'name'\u5b58\u5728\u4e8e\u5b57\u5178\u4e2d")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u7684\u65b9\u5f0f\u662f\u6700\u4e3a\u76f4\u63a5\u548c\u9ad8\u6548\u7684\uff0c\u5b83\u53ef\u4ee5\u5feb\u901f\u5730\u5224\u65ad\u5b57\u5178\u4e2d\u662f\u5426\u5b58\u5728\u67d0\u4e2a\u952e\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u63cf\u8ff0\u5982\u4f55\u5728\u4e0d\u540c\u60c5\u51b5\u4e0b\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\u6765\u5224\u65ad\u5b57\u5178\u5305\u542b\u67d0\u4e2a\u952e\u6216\u503c\u3002<\/p>\n<\/p>\n
\u4e00\u3001\u4f7f\u7528 in<\/code> \u5173\u952e\u5b57\u5224\u65ad\u5b57\u5178\u5305\u542b\u952e<\/h3>\n<\/p>\n
in<\/code> \u5173\u952e\u5b57\u662f\u5224\u65ad\u5b57\u5178\u4e2d\u662f\u5426\u5305\u542b\u67d0\u4e2a\u952e\u6700\u76f4\u63a5\u548c\u5e38\u7528\u7684\u65b9\u6cd5\u3002\u5b83\u7684\u8bed\u6cd5\u7b80\u5355\uff0c\u6267\u884c\u6548\u7387\u9ad8\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
if 'age' in my_dict:<\/p>\n
    print("\u952e'age'\u5b58\u5728\u4e8e\u5b57\u5178\u4e2d")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7in<\/code>\u5173\u952e\u5b57\u5224\u65ad\u5b57\u5178my_dict<\/code>\u4e2d\u662f\u5426\u5b58\u5728\u952e'age'<\/code>\uff0c\u5982\u679c\u5b58\u5728\uff0c\u5219\u8f93\u51fa\u63d0\u793a\u4fe1\u606f\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528 get<\/code> \u65b9\u6cd5\u5224\u65ad\u5b57\u5178\u5305\u542b\u952e<\/h3>\n<\/p>\n
get<\/code> \u65b9\u6cd5\u53ef\u4ee5\u7528\u6765\u83b7\u53d6\u5b57\u5178\u4e2d\u6307\u5b9a\u952e\u7684\u503c\u3002\u5982\u679c\u952e\u5b58\u5728\uff0c\u5219\u8fd4\u56de\u5bf9\u5e94\u7684\u503c\uff1b\u5982\u679c\u952e\u4e0d\u5b58\u5728\uff0c\u5219\u8fd4\u56deNone<\/code>\u6216\u6307\u5b9a\u7684\u9ed8\u8ba4\u503c\u3002\u8fd9\u4e5f\u53ef\u4ee5\u7528\u6765\u5224\u65ad\u5b57\u5178\u662f\u5426\u5305\u542b\u67d0\u4e2a\u952e\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
if my_dict.get('city') is not None:<\/p>\n
    print("\u952e'city'\u5b58\u5728\u4e8e\u5b57\u5178\u4e2d")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7get<\/code>\u65b9\u6cd5\u83b7\u53d6\u952e'city'<\/code>\u5bf9\u5e94\u7684\u503c\uff0c\u5982\u679c\u8fd4\u56de\u503c\u4e0d\u4e3aNone<\/code>\uff0c\u5219\u8868\u793a\u5b57\u5178\u5305\u542b\u8be5\u952e\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528 keys()<\/code> \u65b9\u6cd5\u5224\u65ad\u5b57\u5178\u5305\u542b\u952e<\/h3>\n<\/p>\n
keys()<\/code> \u65b9\u6cd5\u8fd4\u56de\u5b57\u5178\u4e2d\u6240\u6709\u952e\u7684\u4e00\u4e2a\u89c6\u56fe\u5bf9\u8c61\uff0c\u53ef\u4ee5\u5c06\u5176\u8f6c\u6362\u4e3a\u5217\u8868\uff0c\u7136\u540e\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u8fdb\u884c\u5224\u65ad\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
if 'name' in my_dict.keys():<\/p>\n
    print("\u952e'name'\u5b58\u5728\u4e8e\u5b57\u5178\u4e2d")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7keys()<\/code>\u65b9\u6cd5\u83b7\u53d6\u5b57\u5178my_dict<\/code>\u4e2d\u7684\u6240\u6709\u952e\uff0c\u7136\u540e\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u5224\u65ad\u662f\u5426\u5305\u542b\u952e'name'<\/code>\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528 values()<\/code> \u65b9\u6cd5\u5224\u65ad\u5b57\u5178\u5305\u542b\u503c<\/h3>\n<\/p>\n
\u6709\u65f6\u6211\u4eec\u9700\u8981\u5224\u65ad\u5b57\u5178\u4e2d\u662f\u5426\u5305\u542b\u67d0\u4e2a\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528values()<\/code>\u65b9\u6cd5\u83b7\u53d6\u5b57\u5178\u4e2d\u6240\u6709\u503c\u7684\u4e00\u4e2a\u89c6\u56fe\u5bf9\u8c61\uff0c\u7136\u540e\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u8fdb\u884c\u5224\u65ad\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
if 'Alice' in my_dict.values():<\/p>\n
    print("\u503c'Alice'\u5b58\u5728\u4e8e\u5b57\u5178\u4e2d")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7values()<\/code>\u65b9\u6cd5\u83b7\u53d6\u5b57\u5178my_dict<\/code>\u4e2d\u7684\u6240\u6709\u503c\uff0c\u7136\u540e\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u5224\u65ad\u662f\u5426\u5305\u542b\u503c'Alice'<\/code>\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u4f7f\u7528 items()<\/code> \u65b9\u6cd5\u5224\u65ad\u5b57\u5178\u5305\u542b\u952e\u503c\u5bf9<\/h3>\n<\/p>\n
items()<\/code> \u65b9\u6cd5\u8fd4\u56de\u5b57\u5178\u4e2d\u6240\u6709\u952e\u503c\u5bf9\u7684\u4e00\u4e2a\u89c6\u56fe\u5bf9\u8c61\uff0c\u53ef\u4ee5\u5c06\u5176\u8f6c\u6362\u4e3a\u5217\u8868\uff0c\u7136\u540e\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u8fdb\u884c\u5224\u65ad\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
if ('name', 'Alice') in my_dict.items():<\/p>\n
    print("\u952e\u503c\u5bf9('name', 'Alice')\u5b58\u5728\u4e8e\u5b57\u5178\u4e2d")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7items()<\/code>\u65b9\u6cd5\u83b7\u53d6\u5b57\u5178my_dict<\/code>\u4e2d\u7684\u6240\u6709\u952e\u503c\u5bf9\uff0c\u7136\u540e\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u5224\u65ad\u662f\u5426\u5305\u542b\u952e\u503c\u5bf9('name', 'Alice')<\/code>\u3002<\/p>\n<\/p>\n
\u516d\u3001\u5b9e\u8df5\u5e94\u7528<\/h3>\n<\/p>\n
\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5224\u65ad\u5b57\u5178\u662f\u5426\u5305\u542b\u67d0\u4e2a\u952e\u6216\u503c\u662f\u975e\u5e38\u5e38\u89c1\u7684\u9700\u6c42\u3002\u4f8b\u5982\uff0c\u5728\u5904\u7406\u7528\u6237\u8f93\u5165\u65f6\uff0c\u6211\u4eec\u9700\u8981\u786e\u4fdd\u8f93\u5165\u7684\u952e\u5728\u5b57\u5178\u4e2d\u5b58\u5728\uff0c\u4ee5\u907f\u514d\u51fa\u73b0\u9519\u8bef\uff1a<\/p>\n<\/p>\n
user_info = {'username': 'john_doe', 'emAI<\/a>l': 'john@example.com', 'age': 30}<\/p>\n
key_to_check = 'email'<\/p>\n
if key_to_check in user_info:<\/p>\n
    print(f"\u7528\u6237\u4fe1\u606f\u4e2d\u5305\u542b\u952e'{key_to_check}'")<\/p>\n
else:<\/p>\n
    print(f"\u7528\u6237\u4fe1\u606f\u4e2d\u4e0d\u5305\u542b\u952e'{key_to_check}'")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7in<\/code>\u5173\u952e\u5b57\u5224\u65ad\u7528\u6237\u4fe1\u606f\u5b57\u5178user_info<\/code>\u4e2d\u662f\u5426\u5305\u542b\u952e'email'<\/code>\uff0c\u5e76\u6839\u636e\u5224\u65ad\u7ed3\u679c\u8f93\u51fa\u76f8\u5e94\u7684\u4fe1\u606f\u3002<\/p>\n<\/p>\n
\u4e03\u3001\u6027\u80fd\u5bf9\u6bd4<\/h3>\n<\/p>\n
\u5728\u5904\u7406\u5927\u578b\u5b57\u5178\u65f6\uff0c\u4e0d\u540c\u65b9\u6cd5\u7684\u6027\u80fd\u53ef\u80fd\u4f1a\u6709\u6240\u4e0d\u540c\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u76f4\u63a5\u5224\u65ad\u952e\u662f\u5426\u5b58\u5728\u7684\u6548\u7387\u6700\u9ad8\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u6027\u80fd\u6d4b\u8bd5\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
import time<\/p>\n
large_dict = {i: i*2 for i in range(1000000)}<\/p>\n
key_to_check = 999999<\/p>\n
\u4f7f\u7528in\u5173\u952e\u5b57<\/strong><\/h2>\n
start_time = time.time()<\/p>\n
if key_to_check in large_dict:<\/p>\n
    pass<\/p>\n
print("\u4f7f\u7528in\u5173\u952e\u5b57\u8017\u65f6:", time.time() - start_time)<\/p>\n
\u4f7f\u7528get\u65b9\u6cd5<\/strong><\/h2>\n
start_time = time.time()<\/p>\n
if large_dict.get(key_to_check) is not None:<\/p>\n
    pass<\/p>\n
print("\u4f7f\u7528get\u65b9\u6cd5\u8017\u65f6:", time.time() - start_time)<\/p>\n
\u4f7f\u7528keys()\u65b9\u6cd5<\/strong><\/h2>\n
start_time = time.time()<\/p>\n
if key_to_check in large_dict.keys():<\/p>\n
    pass<\/p>\n
print("\u4f7f\u7528keys()\u65b9\u6cd5\u8017\u65f6:", time.time() - start_time)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u6027\u80fd\u6d4b\u8bd5\u4e2d\uff0c\u6211\u4eec\u751f\u6210\u4e86\u4e00\u4e2a\u5305\u542b\u4e00\u767e\u4e07\u4e2a\u952e\u503c\u5bf9\u7684\u5927\u5b57\u5178large_dict<\/code>\uff0c\u7136\u540e\u5206\u522b\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u3001get<\/code>\u65b9\u6cd5\u548ckeys()<\/code>\u65b9\u6cd5\u5224\u65ad\u662f\u5426\u5305\u542b\u952e999999<\/code>\u3002\u901a\u8fc7\u6d4b\u8bd5\u7ed3\u679c\u53ef\u4ee5\u770b\u5230\uff0c\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u7684\u6548\u7387\u662f\u6700\u9ad8\u7684<\/strong>\u3002<\/p>\n<\/p>\n
\u516b\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u5224\u65ad\u5b57\u5178\u662f\u5426\u5305\u542b\u67d0\u4e2a\u952e\u6216\u503c\u7684\u65b9\u6cd5\u6709\u591a\u79cd\uff0c\u5305\u62ec\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u3001get<\/code>\u65b9\u6cd5\u3001keys()<\/code>\u65b9\u6cd5\u3001values()<\/code>\u65b9\u6cd5\u548citems()<\/code>\u65b9\u6cd5\u3002\u5176\u4e2d\uff0c\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u662f\u6700\u4e3a\u76f4\u63a5\u548c\u9ad8\u6548\u7684\u65b9\u6cd5<\/strong>\uff0c\u9002\u7528\u4e8e\u5927\u591a\u6570\u573a\u666f\u3002\u5728\u5904\u7406\u5927\u578b\u5b57\u5178\u65f6\uff0c\u5efa\u8bae\u4f18\u5148\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u8fdb\u884c\u5224\u65ad\uff0c\u4ee5\u83b7\u5f97\u66f4\u597d\u7684\u6027\u80fd\u3002\u901a\u8fc7\u5b9e\u9645\u5e94\u7528\u548c\u6027\u80fd\u6d4b\u8bd5\uff0c\u6211\u4eec\u53ef\u4ee5\u66f4\u597d\u5730\u7406\u89e3\u548c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u6765\u5224\u65ad\u5b57\u5178\u662f\u5426\u5305\u542b\u67d0\u4e2a\u952e\u6216\u503c\u3002<\/p>\n<\/p>\n
\u4e5d\u3001\u5b57\u5178\u64cd\u4f5c\u7684\u5176\u4ed6\u65b9\u6cd5<\/h3>\n<\/p>\n
\u9664\u4e86\u5224\u65ad\u5b57\u5178\u662f\u5426\u5305\u542b\u67d0\u4e2a\u952e\u6216\u503c\uff0c\u5b57\u5178\u64cd\u4f5c\u8fd8\u5305\u62ec\u6dfb\u52a0\u3001\u66f4\u65b0\u3001\u5220\u9664\u952e\u503c\u5bf9\u7b49\u3002\u4e86\u89e3\u8fd9\u4e9b\u64cd\u4f5c\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u66f4\u597d\u5730\u5904\u7406\u548c\u7ba1\u7406\u5b57\u5178\u6570\u636e\u3002<\/p>\n<\/p>\n
\u6dfb\u52a0\u952e\u503c\u5bf9<\/h4>\n<\/p>\n
\u5411\u5b57\u5178\u4e2d\u6dfb\u52a0\u952e\u503c\u5bf9\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7\u8d4b\u503c\u64cd\u4f5c\u5b9e\u73b0\u3002\u5982\u679c\u952e\u5df2\u7ecf\u5b58\u5728\uff0c\u5219\u66f4\u65b0\u5176\u5bf9\u5e94\u7684\u503c\uff1b\u5982\u679c\u952e\u4e0d\u5b58\u5728\uff0c\u5219\u6dfb\u52a0\u65b0\u7684\u952e\u503c\u5bf9\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25}<\/p>\n
my_dict['city'] = 'New York'<\/p>\n
print(my_dict)  # \u8f93\u51fa: {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u66f4\u65b0\u952e\u503c\u5bf9<\/h4>\n<\/p>\n
\u66f4\u65b0\u5b57\u5178\u4e2d\u7684\u952e\u503c\u5bf9\u53ef\u4ee5\u4f7f\u7528\u8d4b\u503c\u64cd\u4f5c\u6216update()<\/code>\u65b9\u6cd5\u3002update()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u4e00\u6b21\u66f4\u65b0\u591a\u4e2a\u952e\u503c\u5bf9\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25}<\/p>\n
my_dict['age'] = 30<\/p>\n
print(my_dict)  # \u8f93\u51fa: {'name': 'Alice', 'age': 30}<\/p>\n
my_dict.update({'city': 'New York', 'age': 28})<\/p>\n
print(my_dict)  # \u8f93\u51fa: {'name': 'Alice', 'age': 28, 'city': 'New York'}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5220\u9664\u952e\u503c\u5bf9<\/h4>\n<\/p>\n
\u4ece\u5b57\u5178\u4e2d\u5220\u9664\u952e\u503c\u5bf9\u53ef\u4ee5\u4f7f\u7528del<\/code>\u5173\u952e\u5b57\u6216pop()<\/code>\u65b9\u6cd5\u3002del<\/code>\u5173\u952e\u5b57\u76f4\u63a5\u5220\u9664\u6307\u5b9a\u7684\u952e\u503c\u5bf9\uff1bpop()<\/code>\u65b9\u6cd5\u5220\u9664\u6307\u5b9a\u952e\u7684\u952e\u503c\u5bf9\u5e76\u8fd4\u56de\u5bf9\u5e94\u7684\u503c\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
del my_dict['city']<\/p>\n
print(my_dict)  # \u8f93\u51fa: {'name': 'Alice', 'age': 25}<\/p>\n
age = my_dict.pop('age')<\/p>\n
print(my_dict)  # \u8f93\u51fa: {'name': 'Alice'}<\/p>\n
print(age)  # \u8f93\u51fa: 25<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u904d\u5386\u5b57\u5178<\/h4>\n<\/p>\n
\u904d\u5386\u5b57\u5178\u53ef\u4ee5\u4f7f\u7528for<\/code>\u5faa\u73af\uff0c\u5206\u522b\u904d\u5386\u952e\u3001\u503c\u6216\u952e\u503c\u5bf9\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
\u904d\u5386\u952e<\/strong><\/h2>\n
for key in my_dict:<\/p>\n
    print(key)<\/p>\n
\u904d\u5386\u503c<\/strong><\/h2>\n
for value in my_dict.values():<\/p>\n
    print(value)<\/p>\n
\u904d\u5386\u952e\u503c\u5bf9<\/strong><\/h2>\n
for key, value in my_dict.items():<\/p>\n
    print(f"{key}: {value}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u904d\u5386\u5b57\u5178\uff0c\u6211\u4eec\u53ef\u4ee5\u65b9\u4fbf\u5730\u8bbf\u95ee\u548c\u5904\u7406\u5b57\u5178\u4e2d\u7684\u6bcf\u4e2a\u952e\u503c\u5bf9\u3002<\/p>\n<\/p>\n
\u5341\u3001\u5b57\u5178\u7684\u9ad8\u7ea7\u64cd\u4f5c<\/h3>\n<\/p>\n
\u9664\u4e86\u57fa\u672c\u7684\u5b57\u5178\u64cd\u4f5c\uff0cPython\u8fd8\u63d0\u4f9b\u4e86\u4e00\u4e9b\u9ad8\u7ea7\u64cd\u4f5c\uff0c\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u66f4\u9ad8\u6548\u5730\u5904\u7406\u5b57\u5178\u6570\u636e\u3002<\/p>\n<\/p>\n
\u5b57\u5178\u63a8\u5bfc\u5f0f<\/h4>\n<\/p>\n
\u5b57\u5178\u63a8\u5bfc\u5f0f\u662f\u4e00\u79cd\u7b80\u6d01\u7684\u521b\u5efa\u5b57\u5178\u7684\u65b9\u6cd5\uff0c\u7c7b\u4f3c\u4e8e\u5217\u8868\u63a8\u5bfc\u5f0f\u3002\u53ef\u4ee5\u6839\u636e\u4e00\u5b9a\u7684\u89c4\u5219\u751f\u6210\u65b0\u7684\u5b57\u5178\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
squares = {x: x*x for x in range(6)}<\/p>\n
print(squares)  # \u8f93\u51fa: {0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5408\u5e76\u5b57\u5178<\/h4>\n<\/p>\n
Python 3.9\u5f15\u5165\u4e86\u5408\u5e76\u5b57\u5178\u7684\u65b0\u8bed\u6cd5\uff0c\u53ef\u4ee5\u4f7f\u7528|<\/code>\u8fd0\u7b97\u7b26\u5408\u5e76\u4e24\u4e2a\u5b57\u5178\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
dict1 = {'a': 1, 'b': 2}<\/p>\n
dict2 = {'b': 3, 'c': 4}<\/p>\n
merged_dict = dict1 | dict2<\/p>\n
print(merged_dict)  # \u8f93\u51fa: {'a': 1, 'b': 3, 'c': 4}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4ece\u952e\u503c\u5bf9\u5217\u8868\u521b\u5efa\u5b57\u5178<\/h4>\n<\/p>\n
\u53ef\u4ee5\u4f7f\u7528dict()<\/code>\u51fd\u6570\u4ece\u952e\u503c\u5bf9\u5217\u8868\u521b\u5efa\u5b57\u5178\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
pairs = [('name', 'Alice'), ('age', 25), ('city', 'New York')]<\/p>\n
my_dict = dict(pairs)<\/p>\n
print(my_dict)  # \u8f93\u51fa: {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528 defaultdict<\/code><\/h4>\n<\/p>\n
defaultdict<\/code> \u662fcollections<\/code>\u6a21\u5757\u4e2d\u7684\u4e00\u4e2a\u5b57\u5178\u5b50\u7c7b\uff0c\u63d0\u4f9b\u4e86\u4e00\u4e2a\u9ed8\u8ba4\u503c\u7528\u4e8e\u5904\u7406\u4e0d\u5b58\u5728\u7684\u952e\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
from collections import defaultdict<\/p>\n
def_dict = defaultdict(int)<\/p>\n
def_dict['a'] += 1<\/p>\n
print(def_dict)  # \u8f93\u51fa: defaultdict(<class 'int'>, {'a': 1})<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2adefaultdict<\/code>\u5bf9\u8c61\uff0c\u5f53\u8bbf\u95ee\u4e0d\u5b58\u5728\u7684\u952e\u65f6\uff0c\u5b83\u4f1a\u81ea\u52a8\u4f7f\u7528\u9ed8\u8ba4\u503c\uff08\u8fd9\u91cc\u662fint<\/code>\uff0c\u53730<\/code>\uff09\u3002<\/p>\n<\/p>\n
\u5341\u4e00\u3001\u5b57\u5178\u7684\u5e94\u7528\u573a\u666f<\/h3>\n<\/p>\n
\u5b57\u5178\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u6709\u5e7f\u6cdb\u7684\u5e94\u7528\u573a\u666f\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u5e94\u7528\u573a\u666f\uff1a<\/p>\n<\/p>\n
\u7edf\u8ba1\u8bcd\u9891<\/h4>\n<\/p>\n
\u5b57\u5178\u53ef\u4ee5\u7528\u6765\u7edf\u8ba1\u6587\u672c\u4e2d\u6bcf\u4e2a\u5355\u8bcd\u7684\u51fa\u73b0\u9891\u7387\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
text = "hello world hello python"<\/p>\n
word_counts = {}<\/p>\n
for word in text.split():<\/p>\n
    if word in word_counts:<\/p>\n
        word_counts[word] += 1<\/p>\n
    else:<\/p>\n
        word_counts[word] = 1<\/p>\n
print(word_counts)  # \u8f93\u51fa: {'hello': 2, 'world': 1, 'python': 1}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u914d\u7f6e\u6587\u4ef6<\/h4>\n<\/p>\n
\u5b57\u5178\u53ef\u4ee5\u7528\u6765\u5b58\u50a8\u548c\u8bfb\u53d6\u914d\u7f6e\u6587\u4ef6\u4e2d\u7684\u914d\u7f6e\u4fe1\u606f\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
config = {<\/p>\n
    'host': 'localhost',<\/p>\n
    'port': 8080,<\/p>\n
    'debug': True<\/p>\n
}<\/p>\n
print(config['host'])  # \u8f93\u51fa: localhost<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5b58\u50a8\u590d\u6742\u6570\u636e\u7ed3\u6784<\/h4>\n<\/p>\n
\u5b57\u5178\u53ef\u4ee5\u7528\u6765\u5b58\u50a8\u590d\u6742\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5982\u5d4c\u5957\u5b57\u5178\u3001\u5217\u8868\u7b49\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
data = {<\/p>\n
    'user1': {'name': 'Alice', 'age': 25},<\/p>\n
    'user2': {'name': 'Bob', 'age': 30}<\/p>\n
}<\/p>\n
print(data['user1']['name'])  # \u8f93\u51fa: Alice<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u8fd9\u4e9b\u5e94\u7528\u573a\u666f\u7684\u793a\u4f8b\uff0c\u6211\u4eec\u53ef\u4ee5\u66f4\u597d\u5730\u7406\u89e3\u5b57\u5178\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u7684\u91cd\u8981\u6027\u548c\u5e94\u7528\u4ef7\u503c\u3002<\/p>\n<\/p>\n
\u5341\u4e8c\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u5b57\u5178\u662f\u4e00\u79cd\u975e\u5e38\u91cd\u8981\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5e7f\u6cdb\u5e94\u7528\u4e8e\u5404\u79cd\u573a\u666f\u3002\u901a\u8fc7\u672c\u6587\u7684\u4ecb\u7ecd\uff0c\u6211\u4eec\u8be6\u7ec6\u4e86\u89e3\u4e86\u5982\u4f55\u5224\u65ad\u5b57\u5178\u662f\u5426\u5305\u542b\u67d0\u4e2a\u952e\u6216\u503c\uff0c\u4ee5\u53ca\u5b57\u5178\u7684\u57fa\u672c\u64cd\u4f5c\u548c\u9ad8\u7ea7\u64cd\u4f5c\u3002\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u5224\u65ad\u5b57\u5178\u5305\u542b\u952e\u662f\u6700\u4e3a\u76f4\u63a5\u548c\u9ad8\u6548\u7684\u65b9\u6cd5<\/strong>\uff0c\u9002\u7528\u4e8e\u5927\u591a\u6570\u573a\u666f\u3002\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u5408\u7406\u4f7f\u7528\u5b57\u5178\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u66f4\u9ad8\u6548\u5730\u5904\u7406\u548c\u7ba1\u7406\u6570\u636e\u3002\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u5728\u4f7f\u7528Python\u5b57\u5178\u65f6\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u5b57\u5178\u4e2d\u68c0\u67e5\u7279\u5b9a\u952e\u7684\u5b58\u5728\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u6765\u5224\u65ad\u5b57\u5178\u4e2d\u662f\u5426\u5305\u542b\u7279\u5b9a\u7684\u952e\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u6709\u4e00\u4e2a\u5b57\u5178my_dict = {'a': 1, 'b': 2}<\/code>\uff0c\u53ef\u4ee5\u901a\u8fc7'a' in my_dict<\/code>\u6765\u68c0\u67e5\u952e'a'\u662f\u5426\u5b58\u5728\u3002\u8fd9\u79cd\u65b9\u6cd5\u4e0d\u4ec5\u7b80\u5355\uff0c\u800c\u4e14\u6548\u7387\u9ad8\u3002<\/p>\n
\u5b57\u5178\u4e2d\u5982\u4f55\u68c0\u67e5\u67d0\u4e2a\u503c\u662f\u5426\u5b58\u5728\uff1f<\/strong>
\u8981\u5224\u65ad\u5b57\u5178\u4e2d\u662f\u5426\u5305\u542b\u7279\u5b9a\u7684\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528values()<\/code>\u65b9\u6cd5\u7ed3\u5408in<\/code>\u5173\u952e\u5b57\u3002\u4f8b\u5982\uff0c2 in my_dict.values()<\/code>\u5c06\u8fd4\u56deTrue<\/code>\uff0c\u56e0\u4e3a\u503c2\u786e\u5b9e\u5728\u5b57\u5178\u4e2d\u5b58\u5728\u3002\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u9700\u8981\u67e5\u627e\u503c\u800c\u975e\u952e\u7684\u573a\u666f\u3002<\/p>\n
\u5982\u4f55\u68c0\u67e5\u5b57\u5178\u662f\u5426\u4e3a\u7a7a\uff1f<\/strong>
\u53ef\u4ee5\u901a\u8fc7\u68c0\u67e5\u5b57\u5178\u7684\u5e03\u5c14\u503c\u6765\u5224\u65ad\u662f\u5426\u4e3a\u7a7a\u3002\u5728Python\u4e2d\uff0c\u7a7a\u5b57\u5178\u4f1a\u88ab\u89c6\u4e3aFalse<\/code>\uff0c\u800c\u975e\u7a7a\u5b57\u5178\u5219\u4e3aTrue<\/code>\u3002\u4f8b\u5982\uff0c\u4f7f\u7528if not my_dict:<\/code>\u53ef\u4ee5\u5224\u65ad\u5b57\u5178\u662f\u5426\u4e3a\u7a7a\u3002\u8fd9\u79cd\u7b80\u6d01\u7684\u5199\u6cd5\u9002\u7528\u4e8e\u5728\u8fdb\u884c\u64cd\u4f5c\u4e4b\u524d\u786e\u8ba4\u5b57\u5178\u7684\u72b6\u6001\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u5224\u65ad\u5b57\u5178\u662f\u5426\u5305\u542b\u67d0\u4e2a\u952e\u6216\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528in\u5173\u952e\u5b57\u3001get\u65b9\u6cd5\u3001keys()\u65b9\u6cd5\u3001values( […]","protected":false},"author":3,"featured_media":1185918,"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\/1185909"}],"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=1185909"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1185909\/revisions"}],"predecessor-version":[{"id":1185921,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1185909\/revisions\/1185921"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1185918"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1185909"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1185909"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1185909"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}