\u6539\u53d8\u4ece\u4e0d\u662f\u4e00\u8e74\u800c\u5c31，\u800c\u662f\u65e5\u79ef\u6708\u7d2f\u7684\u4fee\u6b63\u3002\u4eca\u5929\u7684\u81ea\u5f8b，\u662f\u660e\u5929\u7684\u81ea\u7531\u3002<\/p>\n
\u5b66\u4e60\u6253\u5361\u7b2c\u5341\u4e09\u5929<\/span><\/p>\n \u5728 Python \u4e2d，\u5b57\u5178（Dictionary）\u662f\u4e00\u79cd\u975e\u5e38\u5b9e\u7528\u7684\u53ef\u53d8\u5bb9\u5668\u6a21\u578b，\u5b83\u80fd\u591f\u5b58\u50a8\u4efb\u610f\u7c7b\u578b\u7684\u5bf9\u8c61，\u5728\u6570\u636e\u5904\u7406\u3001\u914d\u7f6e\u7ba1\u7406\u7b49\u573a\u666f\u4e2d\u6709\u7740\u5e7f\u6cdb\u7684\u5e94\u7528\u3002<\/span><\/p>\n \u5b57\u5178\u7531\u4e00\u7cfb\u5217\u952e\u503c\u5bf9(<\/span>key:value<\/span>）\u7ec4\u6210，\u5176\u57fa\u672c\u683c\u5f0f\u5982\u4e0b：<\/p>\n dic\u00a0= {key1: value1, key2: value2, key3: value3}<\/p>\n \u8fd9\u662f\u6700\u5e38\u7528\u7684\u521b\u5efa\u5b57\u5178\u7684\u65b9\u5f0f，\u65e2\u53ef\u4ee5\u521b\u5efa\u7a7a\u5b57\u5178，\u4e5f\u53ef\u4ee5\u521b\u5efa\u5305\u542b\u952e\u503c\u5bf9\u7684\u5b57\u5178<\/p>\n # \u521b\u5efa\u7a7a\u5b57\u5178 # \u521b\u5efa\u5305\u542b\u952e\u503c\u5bf9\u7684\u5b57\u5178 print("\u7a7a\u5b57\u5178:", empty_dict) dict()\u00a0\u51fd\u6570\u4e5f\u53ef\u4ee5\u7528\u4e8e\u521b\u5efa\u5b57\u5178，\u540c\u6837\u53ef\u4ee5\u521b\u5efa\u7a7a\u5b57\u5178\u6216\u5e26\u6709\u952e\u503c\u5bf9\u7684\u5b57\u5178<\/p>\n # \u4f7f\u7528dict()\u51fd\u6570\u521b\u5efa\u7a7a\u5b57\u5178 # \u4f7f\u7528dict()\u51fd\u6570\u521b\u5efa\u5e26\u6709\u952e\u503c\u5bf9\u7684\u5b57\u5178 # \u4f7f\u7528dict()\u51fd\u6570\u4ece\u952e\u503c\u5bf9\u5217\u8868\u521b\u5efa\u5b57\u5178 # \u4f7f\u7528dict()\u51fd\u6570\u4ece\u5173\u952e\u5b57\u53c2\u6570\u521b\u5efa\u5b57\u5178 print("\u7a7a\u5b57\u5178:", empty_dict) 1. dict()\u51fd\u6570\u53ef\u4ee5\u521b\u5efa\u7a7a\u5b57\u5178，\u4e5f\u53ef\u4ee5\u901a\u8fc7\u4e0d\u540c\u53c2\u6570\u5f62\u5f0f\u521b\u5efa\u5e26\u952e\u503c\u5bf9\u7684\u5b57\u5178\u3002 \u8fd9\u662f\u6700\u5e38\u7528\u7684\u65b9\u6cd5，\u901a\u8fc7\u952e\u6765\u8bbf\u95ee\u5bf9\u5e94\u7684\u503c<\/p>\n # \u521b\u5efa\u5b57\u5178 # \u8bbf\u95ee\u503c get()\u65b9\u6cd5\u662f\u8bbf\u95ee\u5b57\u5178\u503c\u7684\u53e6\u4e00\u79cd\u65b9\u5f0f，\u5b83\u6bd4\u65b9\u62ec\u53f7\u8bbf\u95ee\u66f4\u5b89\u5168<\/span><\/p>\n # \u521b\u5efa\u5b57\u5178 # \u4f7f\u7528get()\u65b9\u6cd5\u8bbf\u95ee\u503c # \u5982\u679c\u952e\u4e0d\u5b58\u5728，get()\u8fd4\u56deNone（\u6216\u6307\u5b9a\u7684\u9ed8\u8ba4\u503c） print(f"\u59d3\u540d: {name}, \u4e13\u4e1a: {major}, \u7535\u8bdd: {phone}")<\/p>\n \u8f93\u51fa：\u59d3\u540d: \u5f20\u4e09, \u4e13\u4e1a: \u8ba1\u7b97\u673a\u79d1\u5b66, \u7535\u8bdd: \u672a\u63d0\u4f9b<\/p>\n \u5f53\u5b57\u5178\u7684\u503c\u4e5f\u662f\u5b57\u5178\u65f6，\u53ef\u4ee5\u901a\u8fc7\u591a\u5c42\u8bbf\u95ee<\/p>\n # \u521b\u5efa\u5d4c\u5957\u5b57\u5178 # \u8bbf\u95ee\u5d4c\u5957\u503c print(f"\u516c\u53f8\u6240\u5728\u57ce\u5e02: {city}") # \u8f93\u51fa：\u516c\u53f8\u6240\u5728\u57ce\u5e02: \u4e0a\u6d77 # \u521b\u5efa\u5b57\u5178 # \u904d\u5386\u6240\u6709\u503c # \u904d\u5386\u952e\u503c\u5bf9 # \u521b\u5efa\u5b57\u5178 # \u5b89\u5168\u8bbf\u95ee\u65b9\u6cd5 # \u4f7f\u7528\u793a\u4f8b # \u521b\u5efa\u5b57\u5178 # \u68c0\u67e5\u952e\u662f\u5426\u5b58\u5728 if "notifications" not in settings: # \u521b\u5efa\u5b57\u5178 # \u65b9\u6cd51: \u4f7f\u7528try-except # \u65b9\u6cd52: \u4f7f\u7528get()\u65b9\u6cd5 # \u521b\u5efa\u5305\u542b\u5b57\u5178\u7684\u5217\u8868 # \u8bbf\u95ee\u5217\u8868\u4e2d\u5b57\u5178\u7684\u503c \u8fd9\u662f\u6700\u76f4\u63a5\u7684\u65b9\u6cd5，\u901a\u8fc7\u952e\u540d\u76f4\u63a5\u7ed9\u503c\u8d4b\u65b0\u503c<\/p>\n # \u521b\u5efa\u5b57\u5178 # \u66f4\u65b0\u73b0\u6709\u952e\u7684\u503c print(student) # {'name': '\u5f20\u4e09', 'age': 21, 'grade': '\u5927\u4e09'}<\/p>\n update()\u65b9\u6cd5\u53ef\u4ee5\u4e00\u6b21\u66f4\u65b0\u591a\u4e2a\u952e\u503c\u5bf9：<\/p>\n # \u521b\u5efa\u5b57\u5178 # \u4f7f\u7528update()\u65b9\u6cd5\u66f4\u65b0\u591a\u4e2a\u503c # \u4e5f\u53ef\u4ee5\u4f20\u5165\u5173\u952e\u5b57\u53c2\u6570 setdefault()\u65b9\u6cd5\u5982\u679c\u952e\u4e0d\u5b58\u5728\u5219\u6dfb\u52a0\u952e\u503c\u5bf9，\u5982\u679c\u5b58\u5728\u5219\u8fd4\u56de\u539f\u503c：<\/p>\n # \u521b\u5efa\u5b57\u5178 # \u66f4\u65b0\u5df2\u5b58\u5728\u7684\u952e # \u6dfb\u52a0\u65b0\u952e\u503c\u5bf9 4.\u66f4\u65b0\u5d4c\u5957\u5b57\u5178\u4e2d\u7684\u503c<\/p>\n company = { # \u66f4\u65b0\u5d4c\u5957\u5b57\u5178\u4e2d\u7684\u503c print(company) # {'name': '\u79d1\u6280\u516c\u53f8', 'address': {'city': '\u6df1\u5733', 'district': '\u5357\u5c71\u533a'}}<\/p>\n # \u521b\u5efa\u5b57\u5178 # \u53ea\u6709\u5f53\u5206\u6570\u4f4e\u4e8e\u67d0\u4e2a\u503c\u65f6\u624d\u66f4\u65b0 print(scores) # {'\u6570\u5b66': 90, '\u82f1\u8bed': 92, '\u8bed\u6587': 78}<\/p>\n # \u521b\u5efa\u5b57\u5178 # \u4f7f\u7528\u5b57\u5178\u63a8\u5bfc\u5f0f\u66f4\u65b0\u503c（\u5c06\u6240\u6709\u503c\u4e58\u4ee52） # \u521b\u5efa\u5b57\u5178 # \u6279\u91cf\u66f4\u65b0\u4ef7\u683c（\u589e\u52a010%） print(prices) # {'\u82f9\u679c': 5.5, '\u9999\u8549': 3.3, '\u6a59\u5b50': 4.4}<\/p>\n # \u521b\u5efa\u4e24\u4e2a\u5b57\u5178 # \u5408\u5e76\u66f4\u65b0dict1 \u8fd9\u4e9b\u65b9\u6cd5\u63d0\u4f9b\u4e86\u7075\u6d3b\u7684\u65b9\u5f0f\u6765\u66f4\u65b0\u5b57\u5178\u4e2d\u7684\u503c，\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u3002\u76f4\u63a5\u8d4b\u503c\u9002\u5408\u5355\u4e2a\u503c\u66f4\u65b0，update()\u65b9\u6cd5\u9002\u5408\u6279\u91cf\u66f4\u65b0，\u800c\u5d4c\u5957\u5b57\u5178\u7684\u66f4\u65b0\u9700\u8981\u591a\u5c42\u8bbf\u95ee\u3002<\/p>\n # \u521b\u5efa\u5b57\u5178 # \u5220\u9664\u6307\u5b9a\u952e\u503c\u5bf9 # \u521b\u5efa\u5b57\u5178 # \u5220\u9664\u5e76\u8fd4\u56de\u503c # \u952e\u4e0d\u5b58\u5728\u65f6\u8bbe\u7f6e\u9ed8\u8ba4\u503c popitem() \u65b9\u6cd5\u5220\u9664\u5e76\u8fd4\u56de\u5b57\u5178\u4e2d\u7684\u4efb\u610f\u952e\u503c\u5bf9（\u5728 Python 3.7+ \u4e2d\u4fdd\u8bc1\u5220\u9664\u6700\u540e\u4e00\u4e2a）：<\/p>\n # \u521b\u5efa\u5b57\u5178 # \u5220\u9664\u6700\u540e\u4e00\u4e2a\u952e\u503c\u5bf9 \u4f7f\u7528\u00a0clear()\u00a0\u65b9\u6cd5\u53ef\u4ee5\u6e05\u7a7a\u5b57\u5178\u4e2d\u7684\u6240\u6709\u5143\u7d20，\u5b57\u5178\u672c\u8eab\u4ecd\u7136\u5b58\u5728，\u614e\u7528<\/span>\u3002<\/p>\n # \u793a\u4f8b\u5b57\u5178 student.clear() 5.\u5220\u9664\u6574\u4e2a\u5b57\u5178<\/p>\n \u4f7f\u7528\u00a0del\u00a0\u8bed\u53e5\u53ef\u4ee5\u5220\u9664\u6574\u4e2a\u5b57\u5178，\u5220\u9664\u540e\u5b57\u5178\u4e0d\u518d\u5b58\u5728，\u614e\u7528<\/span>\u3002<\/p>\n # \u793a\u4f8b\u5b57\u5178 del student # \u5220\u9664\u5b57\u5178<\/p>\n # \u6b64\u65f6\u8bbf\u95ee tinydict \u4f1a\u629b\u51fa NameError \u9519\u8bef \u8fd9\u4e9b\u7279\u6027\u4f7f\u5f97 Python \u5b57\u5178\u5728\u5904\u7406\u9700\u8981\u5feb\u901f\u67e5\u627e\u548c\u52a8\u6001\u66f4\u65b0\u7684\u6570\u636e\u65f6\u975e\u5e38\u6709\u7528\u3002<\/p>\n \u7528\u4e8e\u83b7\u53d6\u5b57\u5178\u4e2d\u952e\u503c\u5bf9\u7684\u6570\u91cf<\/p>\n my_dict = {"name": "Alice", "age": 25, "city": "New York"} \u7528\u4e8e\u83b7\u53d6\u5bf9\u8c61\u7684\u7c7b\u578b<\/p>\n my_dict = {"name": "Alice", "age": 25, "city": "New York"} \u5c06\u5b57\u5178\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u8868\u793a\u5f62\u5f0f<\/p>\n my_dict = {"name": "Alice", "age": 25, "city": "New York"} \u8fd4\u56de\u6307\u5b9a\u952e\u5bf9\u5e94\u7684\u503c，\u5982\u679c\u952e\u4e0d\u5b58\u5728，\u5219\u8fd4\u56de\u00a0default（\u5982\u679c\u672a\u6307\u5b9a\u00a0default，\u5219\u8fd4\u56de\u00a0None）<\/p>\n my_dict = {"name": "Alice", "age": 25, "city": "New York"} \u5982\u679c\u952e\u5b58\u5728\u4e8e\u5b57\u5178\u4e2d，\u5219\u8fd4\u56de\u5176\u5bf9\u5e94\u7684\u503c；\u5982\u679c\u952e\u4e0d\u5b58\u5728，\u5219\u5c06\u952e\u6dfb\u52a0\u5230\u5b57\u5178\u4e2d，\u5e76\u5c06\u5176\u503c\u8bbe\u7f6e\u4e3a\u00a0default（\u5982\u679c\u672a\u6307\u5b9a\u00a0default，\u5219\u8bbe\u7f6e\u4e3a\u00a0None）<\/p>\n my_dict = {"name": "Alice", "age": 25} \u7528\u4e8e\u5c06\u4e00\u4e2a\u5b57\u5178\u7684\u952e\u503c\u5bf9\u66f4\u65b0\u5230\u53e6\u4e00\u4e2a\u5b57\u5178\u4e2d\u3002\u5b83\u53ef\u4ee5\u63a5\u53d7\u53e6\u4e00\u4e2a\u5b57\u5178\u6216\u53ef\u8fed\u4ee3\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570<\/p>\n dict1 = {"key1": "value1", "key2": "value2"} dict1.update({"key3": "value3"}) # \u952e\u4e0d\u5b58\u5728\u65f6\u63d2\u5165\u65b0\u952e\u503c\u5bf9 my_dict = {"name": "Alice", "age": 25} 5.copy()\u00a0\u65b9\u6cd5<\/p>\n \u8fd4\u56de\u5b57\u5178\u7684\u4e00\u4e2a\u6d45\u62f7\u8d1d<\/p>\n original_dict = {"name": "Alice", "age": 25} 6.fromkeys()\u00a0\u65b9\u6cd5<\/p>\n \u7528\u4e8e\u521b\u5efa\u4e00\u4e2a\u65b0\u5b57\u5178，\u4ee5\u5e8f\u5217\u4e2d\u7684\u5143\u7d20\u4f5c\u4e3a\u952e，value\u00a0\u4f5c\u4e3a\u6240\u6709\u952e\u5bf9\u5e94\u7684\u521d\u59cb\u503c<\/p>\n keys = ["name", "age", "city"] 7.items()\u00a0\u65b9\u6cd5<\/p>\n \u4ee5\u5217\u8868\u5f62\u5f0f\u8fd4\u56de\u53ef\u904d\u5386\u7684（\u952e，\u503c）\u5143\u7ec4\u6570\u7ec4<\/p>\n my_dict = {"name": "Alice", "age": 25} 8.keys()\u00a0\u65b9\u6cd5<\/p>\n \u4ee5\u5217\u8868\u5f62\u5f0f\u8fd4\u56de\u5b57\u5178\u4e2d\u6240\u6709\u7684\u952e<\/p>\n my_dict = {"name": "Alice", "age": 25} 9.values()\u00a0\u65b9\u6cd5<\/p>\n \u4ee5\u5217\u8868\u5f62\u5f0f\u8fd4\u56de\u5b57\u5178\u4e2d\u6240\u6709\u7684\u503c<\/p>\n my_dict = {"name": "Alice", "age": 25} \u6539\u53d8\u4ece\u4e0d\u662f\u4e00\u8e74\u800c\u5c31，\u800c\u662f\u65e5\u79ef\u6708\u7d2f\u7684\u4fee\u6b63\u3002\u4eca\u5929\u7684\u81ea\u5f8b，\u662f\u660e\u5929\u7684\u81ea\u7531\u3002\u5b66\u4e60\u6253\u5361\u7b2c\u5341\u4e09\u5929\u5728 Python \u4e2d，\u5b57\u5178（Dictionary）\u662f\u4e00\u79cd\u975e\u5e38\u5b9e\u7528\u7684\u53ef\u53d8\u5bb9\u5668\u6a21\u578b，\u5b83\u80fd\u591f\u5b58\u50a8\u4efb\u610f\u7c7b\u578b\u7684\u5bf9\u8c61，\u5728\u6570\u636e\u5904\u7406\u3001\u914d\u7f6e\u7ba1\u7406\u7b49\u573a\u666f\u4e2d\u6709\u7740\u5e7f\u6cdb\u7684\u5e94\u7528\u3002\u4e00\u3001\u5b57\u5178\u7684\u57fa\u672c\u6982\u5ff5\u5b57\u5178\u7531\u4e00\u7cfb\u5217\u952e\u503c\u5bf9(key:value）\u7ec4\u6210，\u5176\u57fa\u672c\u683c\u5f0f\u5982\u4e0b：dic\u00a0 {key1: va<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[7203,81,2884,371,190],"topic":[],"class_list":{"0":"post-68227","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-server","7":"tag-dictionary","8":"tag-python","10":"tag-371","11":"tag-190"},"yoast_head":"\n\u4e00\u3001\u5b57\u5178\u7684\u57fa\u672c\u6982\u5ff5<\/span><\/h2>\n
\n
\u4e8c\u3001\u521b\u5efa\u5b57\u5178<\/span><\/h2>\n
1.\u4f7f\u7528\u5927\u62ec\u53f7（{}）\u521b\u5efa<\/h3>\n
\nempty_dict = {}<\/p>\n
\nsample_dict = {
\n "name": "\u4e54\u5cf0",
\n "age": 24,
\n "city": "\u4e10\u5e2e"
\n}<\/p>\n
\nprint("\u5305\u542b\u952e\u503c\u5bf9\u7684\u5b57\u5178:", sample_dict)<\/p>\n2.\u4f7f\u7528\u5185\u7f6e\u51fd\u6570\u00a0dict()\u00a0\u521b\u5efa<\/h3>\n
\nempty_dict = dict()<\/p>\n
\nsample_dict = dict(name="Alice", age=25, city="Beijing")<\/p>\n
\npairs_dict = dict([("name", "Bob"), ("age", 30), ("city", "Shanghai")])<\/p>\n
\nkwargs_dict = dict(key1="value1", key2="value2")<\/p>\n
\nprint("\u5173\u952e\u5b57\u53c2\u6570\u5b57\u5178:", sample_dict)
\nprint("\u952e\u503c\u5bf9\u5217\u8868\u5b57\u5178:", pairs_dict)
\nprint("\u5173\u952e\u5b57\u53c2\u6570\u5b57\u5178:", kwargs_dict)<\/p>\n
\n2. \u652f\u6301\u5173\u952e\u5b57\u53c2\u6570\u3001\u952e\u503c\u5bf9\u5217\u8868\u7b49\u591a\u79cd\u521b\u5efa\u65b9\u5f0f\u3002
\n3. \u4e0e\u5927\u62ec\u53f7{}\u8bed\u6cd5\u76f8\u6bd4，dict()\u51fd\u6570\u63d0\u4f9b\u4e86\u66f4\u591a\u521b\u5efa\u5b57\u5178\u7684\u7075\u6d3b\u6027\u3002<\/p>\n\u4e09\u3001\u8bbf\u95ee\u5b57\u5178\u7684\u503c<\/span><\/h2>\n
1.\u57fa\u672c\u8bbf\u95ee<\/h3>\n
\nperson = {
\n "name": "\u4e54\u5cf0",
\n "age": 25,
\n "city": "\u5927\u5b8b"
\n}<\/p>\n
\nname = person["name"]
\nage = person["age"]
\nprint(f"\u59d3\u540d: {name}, \u5e74\u9f84: {age}") # \u8f93\u51fa：\u59d3\u540d: \u4e54\u5cf0, \u5e74\u9f84: 25<\/p>\n2.\u4f7f\u7528get()\u65b9\u6cd5\u8bbf\u95ee\u503c<\/h3>\n
\nstudent = {
\n "name": "\u5f20\u4e09",
\n "grade": "\u5927\u4e8c",
\n "major": "\u8ba1\u7b97\u673a\u79d1\u5b66"
\n}<\/p>\n
\nname = student.get("name")
\nmajor = student.get("major")<\/p>\n
\nphone = student.get("phone", "\u672a\u63d0\u4f9b")<\/p>\n3.\u8bbf\u95ee\u5d4c\u5957\u5b57\u5178\u4e2d\u7684\u503c<\/h3>\n
\ncompany = {
\n "name": "\u79d1\u6280\u516c\u53f8",
\n "address": {
\n "city": "\u4e0a\u6d77",
\n "district": "\u6d66\u4e1c\u65b0\u533a"
\n },
\n "employees": [
\n {"name": "\u738b\u4e94", "position": "\u5de5\u7a0b\u5e08"},
\n {"name": "\u8d75\u516d", "position": "\u8bbe\u8ba1\u5e08"}
\n ]
\n}<\/p>\n
\ncity = company["address"]["city"]
\nfirst_employee = company["employees"][0]["name"]<\/p>\n
\nprint(f"\u7b2c\u4e00\u4e2a\u5458\u5de5: {first_employee}")<\/p>\n
\n# \u8f93\u51fa：\u7b2c\u4e00\u4e2a\u5458\u5de5: \u738b\u4e94<\/p>\n4.\u4f7f\u7528for\u5faa\u73af\u904d\u5386\u5b57\u5178\u503c<\/h3>\n
\nscores = {
\n "\u6570\u5b66": 95,
\n "\u82f1\u8bed": 88,
\n "\u8bed\u6587": 92
\n}<\/p>\n
\nprint("\u6240\u6709\u6210\u7ee9:")
\nfor score in scores.values():
\n print(score)<\/p>\n
\nprint("\\\\n\u6240\u6709\u79d1\u76ee\u548c\u6210\u7ee9:")
\nfor subject, score in scores.items():
\n print(f"{subject}: {score}")<\/p>\n5.\u5b89\u5168\u8bbf\u95ee\u5b57\u5178\u503c\u7684\u65b9\u6cd5<\/h3>\n
\ndata = {
\n "username": "user123",
\n "email": "user@example.com"
\n}<\/p>\n
\ndef safe_get(dictionary, key, default=None):
\n return dictionary.get(key, default)<\/p>\n
\nusername = safe_get(data, "username")
\nphone = safe_get(data, "phone", "\u672a\u63d0\u4f9b")
\nprint(f"\u7528\u6237\u540d: {username}")
\nprint(f"\u7535\u8bdd: {phone}")<\/p>\n6.\u4f7f\u7528in\u5173\u952e\u5b57\u68c0\u67e5\u952e\u662f\u5426\u5b58\u5728<\/h3>\n
\nsettings = {
\n "theme": "dark",
\n "language": "zh-CN"
\n}<\/p>\n
\nif "theme" in settings:
\n print(f"\u4e3b\u9898\u8bbe\u7f6e: {settings['theme']}")<\/p>\n
\n print("\u901a\u77e5\u8bbe\u7f6e\u672a\u914d\u7f6e")<\/p>\n7.\u5904\u7406\u952e\u4e0d\u5b58\u5728\u7684\u60c5\u51b5<\/h3>\n
\nconfig = {
\n "debug": True,
\n "port": 8080
\n}<\/p>\n
\ntry:
\n value = config["host"]
\nexcept KeyError:
\n print("\u4e3b\u673a\u914d\u7f6e\u4e0d\u5b58\u5728")<\/p>\n
\nhost = config.get("host", "localhost")
\nprint(f"\u4e3b\u673a\u5730\u5740: {host}")<\/p>\n8.\u8bbf\u95ee\u5217\u8868\u4e2d\u7684\u5b57\u5178\u5143\u7d20<\/h3>\n
\nusers = [
\n {"name": "\u5f20\u4e09", "age": 25},
\n {"name": "\u674e\u56db", "age": 30},
\n {"name": "\u738b\u4e94", "age": 28}
\n]<\/p>\n
\nfirst_user_name = users[0]["name"]
\nsecond_user_age = users[1]["age"]
\nprint(f"\u7b2c\u4e00\u4e2a\u7528\u6237: {first_user_name}, \u7b2c\u4e8c\u4e2a\u7528\u6237\u5e74\u9f84: {second_user_age}")<\/p>\n\u56db\u3001\u4fee\u6539\u5b57\u5178\u4e2d\u7684\u503c<\/span><\/h2>\n
1.\u76f4\u63a5\u8d4b\u503c\u66f4\u65b0<\/h3>\n
\nstudent = {
\n "name": "\u5f20\u4e09",
\n "age": 20,
\n "grade": "\u5927\u4e8c"
\n}<\/p>\n
\nstudent["age"] = 21
\nstudent["grade"] = "\u5927\u4e09"<\/p>\n2.\u4f7f\u7528update()\u65b9\u6cd5<\/h3>\n
\nproduct = {
\n "name": "\u7b14\u8bb0\u672c\u7535\u8111",
\n "price": 5000,
\n "brand": "\u8054\u60f3"
\n}<\/p>\n
\nproduct.update({"price": 4500, "brand": "\u534e\u4e3a"})
\nprint(product) # {'name': '\u7b14\u8bb0\u672c\u7535\u8111', 'price': 4500, 'brand': '\u534e\u4e3a'}<\/p>\n
\nproduct.update(name="\u53f0\u5f0f\u7535\u8111", price=3000)
\nprint(product) # {'name': '\u53f0\u5f0f\u7535\u8111', 'price': 3000, 'brand': '\u534e\u4e3a'}<\/p>\n3.\u4f7f\u7528setdefault()\u65b9\u6cd5<\/h3>\n
\nconfig = {
\n "theme": "dark",
\n "language": "zh-CN"
\n}<\/p>\n
\nconfig.setdefault("theme", "light") # \u8fd4\u56de"dark"，\u4e0d\u6539\u53d8\u539f\u503c
\nprint(config["theme"]) # "dark"<\/p>\n
\nconfig.setdefault("font_size", 14) # \u6dfb\u52a0\u65b0\u952e\u503c\u5bf9
\nprint(config) # {'theme': 'dark', 'language': 'zh-CN', 'font_size': 14}<\/p>\n
\n "name": "\u79d1\u6280\u516c\u53f8",
\n "address": {
\n "city": "\u4e0a\u6d77",
\n "district": "\u6d66\u4e1c\u65b0\u533a"
\n }
\n}<\/p>\n
\ncompany["address"]["city"] = "\u6df1\u5733"
\ncompany["address"]["district"] = "\u5357\u5c71\u533a"<\/p>\n5.\u6761\u4ef6\u6027\u66f4\u65b0<\/h3>\n
\nscores = {
\n "\u6570\u5b66": 85,
\n "\u82f1\u8bed": 92,
\n "\u8bed\u6587": 78
\n}<\/p>\n
\nif scores["\u6570\u5b66"] < 90:
\n scores["\u6570\u5b66"] = 90<\/p>\n6.\u4f7f\u7528\u5b57\u5178\u63a8\u5bfc\u5f0f\u66f4\u65b0<\/h3>\n
\nnumbers = {"a": 1, "b": 2, "c": 3}<\/p>\n
\nupdated_numbers = {key: value * 2 for key, value in numbers.items()}
\nprint(updated_numbers) # {'a': 2, 'b': 4, 'c': 6}<\/p>\n7.\u4f7f\u7528for\u5faa\u73af\u6279\u91cf\u66f4\u65b0<\/h3>\n
\nprices = {"\u82f9\u679c": 5, "\u9999\u8549": 3, "\u6a59\u5b50": 4}<\/p>\n
\nfor fruit in prices:
\n prices[fruit] = round(prices[fruit] * 1.1, 2)<\/p>\n8.\u5408\u5e76\u5b57\u5178\u66f4\u65b0<\/h3>\n
\ndict1 = {"a": 1, "b": 2}
\ndict2 = {"b": 20, "c": 30}<\/p>\n
\ndict1.update(dict2)
\nprint(dict1) # {'a': 1, 'b': 20, 'c': 30}<\/p>\n\u4e94\u3001\u5220\u9664\u5b57\u5178\u5143\u7d20<\/h2>\n
1.\u4f7f\u7528 del \u8bed\u53e5\u5220\u9664\u6307\u5b9a\u952e\u503c\u5bf9<\/h3>\n
\nstudent = {
\n "name": "\u5f20\u4e09",
\n "age": 25,
\n "grade": "\u5927\u4e8c"
\n}<\/p>\n
\ndel student["grade"]
\nprint(student) # {'name': '\u5f20\u4e09', 'age': 25}<\/p>\n2.\u4f7f\u7528 pop() \u65b9\u6cd5\u5220\u9664\u5e76\u8fd4\u56de\u503c<\/h3>\n
\nstudent = {
\n "name": "\u5f20\u4e09",
\n "age": 25,
\n "grade": "\u5927\u4e8c"
\n}<\/p>\n
\ngrade = student.pop("grade")
\nprint(f"\u5220\u9664\u7684\u503c: {grade}") # \u5220\u9664\u7684\u503c: \u5927\u4e8c
\nprint(student) # {'name': '\u5f20\u4e09', 'age': 25}<\/p>\n
\nphone = student.pop("phone", "\u672a\u63d0\u4f9b")
\nprint(f"\u7535\u8bdd: {phone}") # \u7535\u8bdd: \u672a\u63d0\u4f9b<\/p>\n3.\u00a0\u4f7f\u7528 popitem() \u65b9\u6cd5\u5220\u9664\u6700\u540e\u4e00\u4e2a\u952e\u503c\u5bf9<\/h3>\n
\nstudent = {
\n "name": "\u5f20\u4e09",
\n "age": 25,
\n "grade": "\u5927\u4e8c"
\n}<\/p>\n
\nlast_item = student.popitem()
\nprint(f"\u5220\u9664\u7684\u952e\u503c\u5bf9: {last_item}") # \u5220\u9664\u7684\u952e\u503c\u5bf9: ('grade', '\u5927\u4e8c')
\nprint(student) # {'name': '\u5f20\u4e09', 'age': 25}<\/p>\n4.\u4f7f\u7528 clear() \u65b9\u6cd5\u6e05\u7a7a\u6240\u6709\u5143\u7d20<\/h3>\n
\nstudent = {'name': '\u5f20\u4e09', 'age': 20, 'score': 85, 'city': '\u5317\u4eac'}<\/p>\n
\nprint("\u4f7f\u7528 clear \u6e05\u7a7a\u5b57\u5178\u540e:", student)<\/p>\n
\nstudent = {'name': '\u5f20\u4e09', 'age': 20, 'score': 85, 'city': '\u5317\u4eac'}<\/p>\n
\nprint(student)<\/p>\n\u516d\u3001\u7279\u5f81<\/h2>\n
\u4e03\u3001\u5b57\u5178\u5e38\u7528\u5185\u7f6e\u51fd\u6570<\/h2>\n
1.len()\u00a0\u51fd\u6570<\/h3>\n
\nprint(len(my_dict)) # \u8f93\u51fa: 3<\/p>\n2.type()\u00a0\u51fd\u6570<\/h3>\n
\nprint(type(my_dict)) # \u8f93\u51fa: <class 'dict'><\/p>\n3.str()\u00a0\u51fd\u6570<\/h3>\n
\nprint(str(my_dict)) # \u8f93\u51fa: {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n\u516b\u3001\u5b57\u5178\u5e38\u7528\u5185\u7f6e\u65b9\u6cd5<\/h2>\n
1.get(key[, default])\u00a0\u65b9\u6cd5<\/h3>\n
\nprint(my_dict.get("name")) # \u8f93\u51fa: Alice
\nprint(my_dict.get("job", "Not Found")) # \u8f93\u51fa: Not Found<\/p>\n2.setdefault(key[, default])\u00a0\u65b9\u6cd5<\/h3>\n
\ngender = my_dict.setdefault("gender", "Unknown")
\nprint(gender) # \u8f93\u51fa: Unknown
\nprint(my_dict) # \u8f93\u51fa: {'name': 'Alice', 'age': 25, 'gender': 'Unknown'}<\/p>\n3.update([other])\u00a0\u65b9\u6cd5<\/h3>\n
\ndict1.update({"key1": "new_value"}) # \u952e\u5b58\u5728\u65f6\u66f4\u65b0\u503c
\nprint(dict1) # \u8f93\u51fa: {'key1': 'new_value', 'key2': 'value2'}<\/p>\n
\nprint(dict1) # \u8f93\u51fa: {'key1': 'new_value', 'key2': 'value2', 'key3': 'value3'}<\/p>\n4.clear()\u00a0\u65b9\u6cd5<\/h3>\n
\nmy_dict.clear()
\nprint(my_dict) # \u8f93\u51fa: {}<\/p>\n
\nnew_dict = original_dict.copy()
\nprint(new_dict) # \u8f93\u51fa: {'name': 'Alice', 'age': 25}<\/p>\n
\ndefault_value = "Unknown"
\nnew_dict = dict.fromkeys(keys, default_value)
\nprint(new_dict) # \u8f93\u51fa: {'name': 'Unknown', 'age': 'Unknown', 'city': 'Unknown'}<\/p>\n
\nprint(my_dict.items()) # \u8f93\u51fa: dict_items([('name', 'Alice'), ('age', 25)])<\/p>\n
\nprint(my_dict.keys()) # \u8f93\u51fa: dict_keys(['name', 'age'])<\/p>\n
\nprint(my_dict.values()) # \u8f93\u51fa: dict_values(['Alice', 25])<\/p>\n","protected":false},"excerpt":{"rendered":"