{"id":1033092,"date":"2024-12-31T11:38:56","date_gmt":"2024-12-31T03:38:56","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1033092.html"},"modified":"2024-12-31T11:38:58","modified_gmt":"2024-12-31T03:38:58","slug":"python%e5%a6%82%e4%bd%95%e5%b0%86%e6%95%b0%e6%8d%ae%e5%ad%98%e5%88%b0%e5%ad%97%e5%85%b8%e4%b8%ad","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1033092.html","title":{"rendered":"Python\u5982\u4f55\u5c06\u6570\u636e\u5b58\u5230\u5b57\u5178\u4e2d"},"content":{"rendered":"

\"Python\u5982\u4f55\u5c06\u6570\u636e\u5b58\u5230\u5b57\u5178\u4e2d\"<\/p>\n

Python\u5c06\u6570\u636e\u5b58\u5230\u5b57\u5178\u4e2d\u7684\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528\u5b57\u5178\u7684\u952e\u503c\u5bf9\u5b58\u50a8\u3001\u4f7f\u7528update()\u65b9\u6cd5\u8fdb\u884c\u6279\u91cf\u66f4\u65b0\u3001\u4f7f\u7528defaultdict\u5904\u7406\u7f3a\u5931\u952e\u503c\u60c5\u51b5\u3002<\/strong>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5176\u4e2d\u4e00\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528\u5b57\u5178\u7684\u952e\u503c\u5bf9\u5b58\u50a8<\/strong>\u3002\u5728Python\u4e2d\uff0c\u5b57\u5178\u662f\u4e00\u79cd\u5e38\u7528\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u80fd\u591f\u5b58\u50a8\u952e\u503c\u5bf9\uff0c\u5177\u6709\u9ad8\u6548\u7684\u67e5\u627e\u548c\u4fee\u6539\u6027\u80fd\u3002\u8981\u5c06\u6570\u636e\u5b58\u50a8\u5230\u5b57\u5178\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u5b57\u5178\u7684\u952e\u548c\u503c\u6765\u8fdb\u884c\u5b58\u50a8\uff0c\u8fd9\u79cd\u65b9\u6cd5\u7b80\u5355\u76f4\u89c2\uff0c\u6613\u4e8e\u7406\u89e3\u548c\u4f7f\u7528\u3002<\/p>\n<\/p>\n

\u4f7f\u7528\u5b57\u5178\u7684\u952e\u503c\u5bf9\u5b58\u50a8\uff1a<\/p>\n<\/p>\n

    \n
  1. \u9996\u5148\uff0c\u521b\u5efa\u4e00\u4e2a\u7a7a\u5b57\u5178\u3002<\/li>\n
  2. \u5176\u6b21\uff0c\u901a\u8fc7\u8d4b\u503c\u64cd\u4f5c\uff0c\u5c06\u6570\u636e\u5b58\u50a8\u5230\u5b57\u5178\u4e2d\u3002<\/li>\n
  3. \u6700\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7\u952e\u6765\u8bbf\u95ee\u548c\u4fee\u6539\u5b57\u5178\u4e2d\u7684\u6570\u636e\u3002<\/li>\n<\/ol>\n

    \u4f8b\u5982\uff1a<\/p>\n<\/p>\n

    # \u521b\u5efa\u4e00\u4e2a\u7a7a\u5b57\u5178<\/p>\n
    data_dict = {}<\/p>\n
    \u5c06\u6570\u636e\u5b58\u50a8\u5230\u5b57\u5178\u4e2d<\/strong><\/h2>\n
    data_dict['name'] = 'Alice'<\/p>\n
    data_dict['age'] = 25<\/p>\n
    data_dict['city'] = 'New York'<\/p>\n
    \u8bbf\u95ee\u548c\u4fee\u6539\u5b57\u5178\u4e2d\u7684\u6570\u636e<\/strong><\/h2>\n
    print(data_dict['name'])  # \u8f93\u51fa\uff1aAlice<\/p>\n
    data_dict['age'] = 26<\/p>\n
    print(data_dict['age'])  # \u8f93\u51fa\uff1a26<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u901a\u8fc7\u4ee5\u4e0a\u6b65\u9aa4\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u8f7b\u677e\u5730\u5c06\u6570\u636e\u5b58\u50a8\u5230\u5b57\u5178\u4e2d\uff0c\u5e76\u8fdb\u884c\u8bbf\u95ee\u548c\u4fee\u6539\u3002<\/p>\n<\/p>\n
    \u4e00\u3001\u4f7f\u7528\u5b57\u5178\u7684\u952e\u503c\u5bf9\u5b58\u50a8<\/h3>\n<\/p>\n
    \u5728Python\u4e2d\uff0c\u5b57\u5178\uff08dictionary\uff09\u662f\u4e00\u79cd\u7528\u4e8e\u5b58\u50a8\u952e\u503c\u5bf9\u7684\u6570\u636e\u7ed3\u6784\u3002\u6bcf\u4e2a\u952e\uff08key\uff09\u5fc5\u987b\u662f\u552f\u4e00\u7684\uff0c\u800c\u6bcf\u4e2a\u503c\uff08value\uff09\u53ef\u4ee5\u662f\u4efb\u4f55\u7c7b\u578b\u7684\u6570\u636e\uff08\u5305\u62ec\u5217\u8868\u3001\u5143\u7ec4\u3001\u5b57\u7b26\u4e32\u7b49\uff09\u3002\u4f7f\u7528\u5b57\u5178\u7684\u952e\u503c\u5bf9\u5b58\u50a8\u65b9\u6cd5\u975e\u5e38\u76f4\u89c2\u4e14\u6613\u4e8e\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
    1. \u521b\u5efa\u5b57\u5178<\/h4>\n<\/p>\n
    \u9996\u5148\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\u521b\u5efa\u4e00\u4e2a\u5b57\u5178\uff1a<\/p>\n<\/p>\n
    # \u521b\u5efa\u4e00\u4e2a\u7a7a\u5b57\u5178<\/p>\n
    empty_dict = {}<\/p>\n
    \u521b\u5efa\u4e00\u4e2a\u5305\u542b\u521d\u59cb\u952e\u503c\u5bf9\u7684\u5b57\u5178<\/strong><\/h2>\n
    person = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    2. \u6dfb\u52a0\u548c\u4fee\u6539\u952e\u503c\u5bf9<\/h4>\n<\/p>\n
    \u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5c06\u952e\u548c\u503c\u5173\u8054\u8d77\u6765\u7684\u65b9\u5f0f\u5411\u5b57\u5178\u4e2d\u6dfb\u52a0\u6570\u636e\u6216\u4fee\u6539\u73b0\u6709\u6570\u636e\uff1a<\/p>\n<\/p>\n
    # \u521b\u5efa\u4e00\u4e2a\u7a7a\u5b57\u5178<\/p>\n
    data_dict = {}<\/p>\n
    \u6dfb\u52a0\u952e\u503c\u5bf9<\/strong><\/h2>\n
    data_dict['name'] = 'Alice'<\/p>\n
    data_dict['age'] = 25<\/p>\n
    data_dict['city'] = 'New York'<\/p>\n
    \u4fee\u6539\u952e\u503c\u5bf9<\/strong><\/h2>\n
    data_dict['age'] = 26<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    3. \u8bbf\u95ee\u548c\u5220\u9664\u952e\u503c\u5bf9<\/h4>\n<\/p>\n
    \u8981\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u4f7f\u7528\u76f8\u5e94\u7684\u952e\u3002\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528del<\/code>\u5173\u952e\u5b57\u5220\u9664\u5b57\u5178\u4e2d\u7684\u67d0\u4e2a\u952e\u503c\u5bf9\uff1a<\/p>\n<\/p>\n
    # \u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u6570\u636e<\/p>\n
    print(data_dict['name'])  # \u8f93\u51fa\uff1aAlice<\/p>\n
    \u5220\u9664\u952e\u503c\u5bf9<\/strong><\/h2>\n
    del data_dict['city']<\/p>\n
    print(data_dict)  # \u8f93\u51fa\uff1a{'name': 'Alice', 'age': 26}<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u4e8c\u3001\u4f7f\u7528update()\u65b9\u6cd5\u8fdb\u884c\u6279\u91cf\u66f4\u65b0<\/h3>\n<\/p>\n
    \u9664\u4e86\u9010\u4e2a\u6dfb\u52a0\u548c\u4fee\u6539\u952e\u503c\u5bf9\u5916\uff0cPython\u5b57\u5178\u8fd8\u63d0\u4f9b\u4e86update()<\/code>\u65b9\u6cd5\uff0c\u53ef\u4ee5\u7528\u6765\u6279\u91cf\u66f4\u65b0\u5b57\u5178\u4e2d\u7684\u6570\u636e\u3002update()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u5c06\u53e6\u4e00\u4e2a\u5b57\u5178\u6216\u53ef\u8fed\u4ee3\u5bf9\u8c61\u7684\u952e\u503c\u5bf9\u6dfb\u52a0\u5230\u5f53\u524d\u5b57\u5178\u4e2d\u3002<\/p>\n<\/p>\n
    1. \u4f7f\u7528\u53e6\u4e00\u4e2a\u5b57\u5178\u66f4\u65b0<\/h4>\n<\/p>\n
    \u6211\u4eec\u53ef\u4ee5\u5c06\u4e00\u4e2a\u5b57\u5178\u4f20\u9012\u7ed9update()<\/code>\u65b9\u6cd5\uff0c\u4ee5\u5c06\u5176\u952e\u503c\u5bf9\u6dfb\u52a0\u5230\u5f53\u524d\u5b57\u5178\u4e2d\uff1a<\/p>\n<\/p>\n
    # \u521b\u5efa\u4e24\u4e2a\u5b57\u5178<\/p>\n
    data_dict = {'name': 'Alice', 'age': 25}<\/p>\n
    new_data = {'city': 'New York', 'occupation': 'Engineer'}<\/p>\n
    \u4f7f\u7528update()\u65b9\u6cd5\u66f4\u65b0\u5b57\u5178<\/strong><\/h2>\n
    data_dict.update(new_data)<\/p>\n
    print(data_dict)  # \u8f93\u51fa\uff1a{'name': 'Alice', 'age': 25, 'city': 'New York', 'occupation': 'Engineer'}<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    2. \u4f7f\u7528\u53ef\u8fed\u4ee3\u5bf9\u8c61\u66f4\u65b0<\/h4>\n<\/p>\n
    \u9664\u4e86\u5b57\u5178\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5305\u542b\u952e\u503c\u5bf9\u7684\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff08\u5982\u5217\u8868\u3001\u5143\u7ec4\uff09\u6765\u66f4\u65b0\u5b57\u5178\uff1a<\/p>\n<\/p>\n
    # \u521b\u5efa\u4e00\u4e2a\u5b57\u5178<\/p>\n
    data_dict = {'name': 'Alice', 'age': 25}<\/p>\n
    \u4f7f\u7528\u5305\u542b\u952e\u503c\u5bf9\u7684\u5217\u8868\u66f4\u65b0\u5b57\u5178<\/strong><\/h2>\n
    data_dict.update([('city', 'New York'), ('occupation', 'Engineer')])<\/p>\n
    print(data_dict)  # \u8f93\u51fa\uff1a{'name': 'Alice', 'age': 25, 'city': 'New York', 'occupation': 'Engineer'}<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u4e09\u3001\u4f7f\u7528defaultdict\u5904\u7406\u7f3a\u5931\u952e\u503c\u60c5\u51b5<\/h3>\n<\/p>\n
    \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5904\u7406\u5b57\u5178\u4e2d\u7f3a\u5931\u7684\u952e\u503c\u3002\u6b64\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528collections<\/code>\u6a21\u5757\u4e2d\u7684defaultdict<\/code>\u7c7b\u3002defaultdict<\/code>\u5141\u8bb8\u6211\u4eec\u4e3a\u7f3a\u5931\u7684\u952e\u63d0\u4f9b\u4e00\u4e2a\u9ed8\u8ba4\u503c\uff0c\u4ece\u800c\u907f\u514d\u629b\u51faKeyError<\/code>\u5f02\u5e38\u3002<\/p>\n<\/p>\n
    1. \u521b\u5efadefaultdict<\/h4>\n<\/p>\n
    \u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4f20\u9012\u4e00\u4e2a\u9ed8\u8ba4\u503c\u5de5\u5382\u51fd\u6570\u6765\u521b\u5efa\u4e00\u4e2adefaultdict<\/code>\u3002\u9ed8\u8ba4\u503c\u5de5\u5382\u51fd\u6570\u53ef\u4ee5\u662f\u4efb\u4f55\u53ef\u8c03\u7528\u5bf9\u8c61\uff0c\u4f8b\u5982int<\/code>\u3001list<\/code>\u3001set<\/code>\u7b49\u3002<\/p>\n<\/p>\n
    from collections import defaultdict<\/p>\n
    \u521b\u5efa\u4e00\u4e2adefaultdict\uff0c\u9ed8\u8ba4\u503c\u4e3a\u6574\u65700<\/strong><\/h2>\n
    default_dict = defaultdict(int)<\/p>\n
    \u8bbf\u95ee\u7f3a\u5931\u7684\u952e\u65f6\uff0c\u8fd4\u56de\u9ed8\u8ba4\u503c0<\/strong><\/h2>\n
    print(default_dict['age'])  # \u8f93\u51fa\uff1a0<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    2. \u4f7f\u7528defaultdict\u5b58\u50a8\u548c\u8bbf\u95ee\u6570\u636e<\/h4>\n<\/p>\n
    defaultdict<\/code>\u7684\u4f7f\u7528\u65b9\u6cd5\u4e0e\u666e\u901a\u5b57\u5178\u7c7b\u4f3c\uff0c\u6211\u4eec\u53ef\u4ee5\u5411\u5176\u4e2d\u6dfb\u52a0\u3001\u8bbf\u95ee\u548c\u4fee\u6539\u952e\u503c\u5bf9\uff1a<\/p>\n<\/p>\n
    # \u521b\u5efa\u4e00\u4e2adefaultdict\uff0c\u9ed8\u8ba4\u503c\u4e3a\u7a7a\u5217\u8868<\/p>\n
    default_dict = defaultdict(list)<\/p>\n
    \u5411defaultdict\u6dfb\u52a0\u6570\u636e<\/strong><\/h2>\n
    default_dict['fruits'].append('apple')<\/p>\n
    default_dict['fruits'].append('banana')<\/p>\n
    \u8bbf\u95eedefaultdict\u4e2d\u7684\u6570\u636e<\/strong><\/h2>\n
    print(default_dict['fruits'])  # \u8f93\u51fa\uff1a['apple', 'banana']<\/p>\n
    print(default_dict['vegetables'])  # \u8f93\u51fa\uff1a[]<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u56db\u3001\u4f7f\u7528\u5b57\u5178\u8fdb\u884c\u6570\u636e\u7edf\u8ba1<\/h3>\n<\/p>\n
    \u5b57\u5178\u5728\u6570\u636e\u7edf\u8ba1\u548c\u6570\u636e\u5904\u7406\u65b9\u9762\u4e5f\u975e\u5e38\u6709\u7528\u3002\u6211\u4eec\u53ef\u4ee5\u5229\u7528\u5b57\u5178\u6765\u7edf\u8ba1\u6570\u636e\u7684\u9891\u6b21\u3001\u5206\u7ec4\u6570\u636e\u7b49\u3002<\/p>\n<\/p>\n
    1. \u7edf\u8ba1\u5b57\u7b26\u9891\u6b21<\/h4>\n<\/p>\n
    \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u6765\u7edf\u8ba1\u5b57\u7b26\u4e32\u4e2d\u6bcf\u4e2a\u5b57\u7b26\u51fa\u73b0\u7684\u9891\u6b21\uff1a<\/p>\n<\/p>\n
    # \u521b\u5efa\u4e00\u4e2a\u5b57\u7b26\u4e32<\/p>\n
    text = "hello world"<\/p>\n
    \u521b\u5efa\u4e00\u4e2a\u7a7a\u5b57\u5178<\/strong><\/h2>\n
    char_count = {}<\/p>\n
    \u7edf\u8ba1\u5b57\u7b26\u9891\u6b21<\/strong><\/h2>\n
    for char in text:<\/p>\n
        if char in char_count:<\/p>\n
            char_count[char] += 1<\/p>\n
        else:<\/p>\n
            char_count[char] = 1<\/p>\n
    print(char_count)  # \u8f93\u51fa\uff1a{'h': 1, 'e': 1, 'l': 3, 'o': 2, ' ': 1, 'w': 1, 'r': 1, 'd': 1}<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    2. \u5206\u7ec4\u6570\u636e<\/h4>\n<\/p>\n
    \u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u6765\u5206\u7ec4\u6570\u636e\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u5305\u542b\u591a\u4e2a\u5b66\u751f\u6210\u7ee9\u7684\u5217\u8868\uff0c\u6211\u4eec\u53ef\u4ee5\u6839\u636e\u5206\u6570\u6bb5\u5c06\u5b66\u751f\u5206\u7ec4\uff1a<\/p>\n<\/p>\n
    # \u521b\u5efa\u5b66\u751f\u6210\u7ee9\u5217\u8868<\/p>\n
    scores = [85, 92, 78, 90, 88, 76, 95, 89, 84, 91]<\/p>\n
    \u521b\u5efa\u4e00\u4e2a\u7a7a\u5b57\u5178<\/strong><\/h2>\n
    score_groups = {'80-89': [], '90-100': [], '70-79': []}<\/p>\n
    \u5206\u7ec4\u6570\u636e<\/strong><\/h2>\n
    for score in scores:<\/p>\n
        if 80 <= score <= 89:<\/p>\n
            score_groups['80-89'].append(score)<\/p>\n
        elif 90 <= score <= 100:<\/p>\n
            score_groups['90-100'].append(score)<\/p>\n
        elif 70 <= score <= 79:<\/p>\n
            score_groups['70-79'].append(score)<\/p>\n
    print(score_groups)  # \u8f93\u51fa\uff1a{'80-89': [85, 88, 89, 84], '90-100': [92, 90, 95, 91], '70-79': [78, 76]}<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u4e94\u3001\u5b57\u5178\u7684\u5176\u4ed6\u5e38\u7528\u65b9\u6cd5<\/h3>\n<\/p>\n
    \u9664\u4e86\u4e0a\u8ff0\u5e38\u89c1\u7684\u64cd\u4f5c\uff0cPython\u5b57\u5178\u8fd8\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5176\u4ed6\u5e38\u7528\u7684\u65b9\u6cd5\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u66f4\u65b9\u4fbf\u5730\u5904\u7406\u5b57\u5178\u6570\u636e\u3002<\/p>\n<\/p>\n
    1. keys()\u65b9\u6cd5<\/h4>\n<\/p>\n
    keys()<\/code>\u65b9\u6cd5\u8fd4\u56de\u5b57\u5178\u4e2d\u7684\u6240\u6709\u952e\uff1a<\/p>\n<\/p>\n
    # \u521b\u5efa\u4e00\u4e2a\u5b57\u5178<\/p>\n
    data_dict = {'name': 'Alice', 'age': 25, 'city': 'New York'}<\/p>\n
    \u83b7\u53d6\u5b57\u5178\u4e2d\u7684\u6240\u6709\u952e<\/strong><\/h2>\n
    keys = data_dict.keys()<\/p>\n
    print(keys)  # \u8f93\u51fa\uff1adict_keys(['name', 'age', 'city'])<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    2. values()\u65b9\u6cd5<\/h4>\n<\/p>\n
    values()<\/code>\u65b9\u6cd5\u8fd4\u56de\u5b57\u5178\u4e2d\u7684\u6240\u6709\u503c\uff1a<\/p>\n<\/p>\n
    # \u83b7\u53d6\u5b57\u5178\u4e2d\u7684\u6240\u6709\u503c<\/p>\n
    values = data_dict.values()<\/p>\n
    print(values)  # \u8f93\u51fa\uff1adict_values(['Alice', 25, 'New York'])<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    3. items()\u65b9\u6cd5<\/h4>\n<\/p>\n
    items()<\/code>\u65b9\u6cd5\u8fd4\u56de\u5b57\u5178\u4e2d\u7684\u6240\u6709\u952e\u503c\u5bf9\uff0c\u4ee5\u5143\u7ec4\u7684\u5f62\u5f0f\u8868\u793a\uff1a<\/p>\n<\/p>\n
    # \u83b7\u53d6\u5b57\u5178\u4e2d\u7684\u6240\u6709\u952e\u503c\u5bf9<\/p>\n
    items = data_dict.items()<\/p>\n
    print(items)  # \u8f93\u51fa\uff1adict_items([('name', 'Alice'), ('age', 25), ('city', 'New York')])<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    4. get()\u65b9\u6cd5<\/h4>\n<\/p>\n
    get()<\/code>\u65b9\u6cd5\u7528\u4e8e\u5b89\u5168\u5730\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\uff0c\u5982\u679c\u952e\u4e0d\u5b58\u5728\uff0c\u5219\u8fd4\u56de\u6307\u5b9a\u7684\u9ed8\u8ba4\u503c\uff08\u9ed8\u8ba4\u4e3aNone<\/code>\uff09\uff1a<\/p>\n<\/p>\n
    # \u5b89\u5168\u5730\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c<\/p>\n
    name = data_dict.get('name', 'Unknown')<\/p>\n
    print(name)  # \u8f93\u51fa\uff1aAlice<\/p>\n
    \u8bbf\u95ee\u4e0d\u5b58\u5728\u7684\u952e\uff0c\u8fd4\u56de\u9ed8\u8ba4\u503c<\/strong><\/h2>\n
    country = data_dict.get('country', 'Unknown')<\/p>\n
    print(country)  # \u8f93\u51fa\uff1aUnknown<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    5. pop()\u65b9\u6cd5<\/h4>\n<\/p>\n
    pop()<\/code>\u65b9\u6cd5\u7528\u4e8e\u5220\u9664\u5b57\u5178\u4e2d\u7684\u6307\u5b9a\u952e\uff0c\u5e76\u8fd4\u56de\u8be5\u952e\u5bf9\u5e94\u7684\u503c\uff1a<\/p>\n<\/p>\n
    # \u5220\u9664\u5b57\u5178\u4e2d\u7684\u6307\u5b9a\u952e\uff0c\u5e76\u8fd4\u56de\u5176\u503c<\/p>\n
    age = data_dict.pop('age')<\/p>\n
    print(age)  # \u8f93\u51fa\uff1a25<\/p>\n
    print(data_dict)  # \u8f93\u51fa\uff1a{'name': 'Alice', 'city': 'New York'}<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u516d\u3001\u5b57\u5178\u7684\u5d4c\u5957\u4f7f\u7528<\/h3>\n<\/p>\n
    \u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u4f1a\u9047\u5230\u9700\u8981\u4f7f\u7528\u5d4c\u5957\u5b57\u5178\u7684\u60c5\u51b5\u3002\u5d4c\u5957\u5b57\u5178\u662f\u6307\u5b57\u5178\u7684\u503c\u672c\u8eab\u4e5f\u662f\u4e00\u4e2a\u5b57\u5178\uff0c\u8fd9\u79cd\u7ed3\u6784\u53ef\u4ee5\u7528\u4e8e\u8868\u793a\u66f4\u590d\u6742\u7684\u6570\u636e\u5173\u7cfb\u3002<\/p>\n<\/p>\n
    1. \u521b\u5efa\u5d4c\u5957\u5b57\u5178<\/h4>\n<\/p>\n
    \u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5c06\u4e00\u4e2a\u5b57\u5178\u4f5c\u4e3a\u53e6\u4e00\u4e2a\u5b57\u5178\u7684\u503c\u6765\u521b\u5efa\u5d4c\u5957\u5b57\u5178\uff1a<\/p>\n<\/p>\n
    # \u521b\u5efa\u5d4c\u5957\u5b57\u5178<\/p>\n
    nested_dict = {<\/p>\n
        'person1': {'name': 'Alice', 'age': 25, 'city': 'New York'},<\/p>\n
        'person2': {'name': 'Bob', 'age': 30, 'city': 'Los Angeles'}<\/p>\n
    }<\/p>\n
    print(nested_dict)<\/p>\n
    \u8f93\u51fa\uff1a{'person1': {'name': 'Alice', 'age': 25, 'city': 'New York'}, 'person2': {'name': 'Bob', 'age': 30, 'city': 'Los Angeles'}}<\/strong><\/h2>\n
    <\/code><\/pre>\n<\/p>\n
    2. \u8bbf\u95ee\u548c\u4fee\u6539\u5d4c\u5957\u5b57\u5178<\/h4>\n<\/p>\n
    \u8981\u8bbf\u95ee\u548c\u4fee\u6539\u5d4c\u5957\u5b57\u5178\u4e2d\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u901a\u8fc7\u591a\u7ea7\u952e\u8fdb\u884c\u8bbf\u95ee\uff1a<\/p>\n<\/p>\n
    # \u8bbf\u95ee\u5d4c\u5957\u5b57\u5178\u4e2d\u7684\u6570\u636e<\/p>\n
    name_person1 = nested_dict['person1']['name']<\/p>\n
    print(name_person1)  # \u8f93\u51fa\uff1aAlice<\/p>\n
    \u4fee\u6539\u5d4c\u5957\u5b57\u5178\u4e2d\u7684\u6570\u636e<\/strong><\/h2>\n
    nested_dict['person2']['age'] = 31<\/p>\n
    print(nested_dict['person2']['age'])  # \u8f93\u51fa\uff1a31<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    3. \u6dfb\u52a0\u65b0\u7684\u5d4c\u5957\u5b57\u5178<\/h4>\n<\/p>\n
    \u6211\u4eec\u8fd8\u53ef\u4ee5\u5411\u5d4c\u5957\u5b57\u5178\u4e2d\u6dfb\u52a0\u65b0\u7684\u5d4c\u5957\u5b57\u5178\uff1a<\/p>\n<\/p>\n
    # \u6dfb\u52a0\u65b0\u7684\u5d4c\u5957\u5b57\u5178<\/p>\n
    nested_dict['person3'] = {'name': 'Charlie', 'age': 28, 'city': 'Chicago'}<\/p>\n
    print(nested_dict)<\/p>\n
    \u8f93\u51fa\uff1a{'person1': {'name': 'Alice', 'age': 25, 'city': 'New York'}, 'person2': {'name': 'Bob', 'age': 31, 'city': 'Los Angeles'}, 'person3': {'name': 'Charlie', 'age': 28, 'city': 'Chicago'}}<\/strong><\/h2>\n
    <\/code><\/pre>\n<\/p>\n
    \u4e03\u3001\u5b57\u5178\u7684\u5e94\u7528\u573a\u666f<\/h3>\n<\/p>\n
    \u5b57\u5178\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u6709\u7740\u5e7f\u6cdb\u7684\u7528\u9014\uff0c\u53ef\u4ee5\u7528\u4e8e\u5404\u79cd\u6570\u636e\u5904\u7406\u548c\u5206\u6790\u4efb\u52a1\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u5e94\u7528\u573a\u666f\uff1a<\/p>\n<\/p>\n
    1. \u914d\u7f6e\u7ba1\u7406<\/h4>\n<\/p>\n
    \u5b57\u5178\u5e38\u7528\u4e8e\u5b58\u50a8\u548c\u7ba1\u7406\u914d\u7f6e\u6570\u636e\uff0c\u4f8b\u5982\u5e94\u7528\u7a0b\u5e8f\u7684\u8bbe\u7f6e\u548c\u53c2\u6570\uff1a<\/p>\n<\/p>\n
    # \u521b\u5efa\u4e00\u4e2a\u914d\u7f6e\u5b57\u5178<\/p>\n
    config = {<\/p>\n
        'database': {'host': 'localhost', 'port': 5432, 'user': 'admin', 'password': 'secret'},<\/p>\n
        'api': {'endpoint': 'https:\/\/api.example.com', 'key': 'API_KEY'}<\/p>\n
    }<\/p>\n
    \u8bbf\u95ee\u914d\u7f6e\u6570\u636e<\/strong><\/h2>\n
    db_host = config['database']['host']<\/p>\n
    api_endpoint = config['api']['endpoint']<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    2. \u6570\u636e\u6620\u5c04<\/h4>\n<\/p>\n
    \u5b57\u5178\u53ef\u4ee5\u7528\u4e8e\u6570\u636e\u6620\u5c04\uff0c\u4f8b\u5982\u5c06\u552f\u4e00\u6807\u8bc6\u7b26\u6620\u5c04\u5230\u5177\u4f53\u7684\u6570\u636e\u5bf9\u8c61\uff1a<\/p>\n<\/p>\n
    # \u521b\u5efa\u4e00\u4e2a\u6570\u636e\u6620\u5c04\u5b57\u5178<\/p>\n
    user_data = {<\/p>\n
        'user1': {'name': 'Alice', 'emAI<\/a>l': 'alice@example.com'},<\/p>\n
        'user2': {'name': 'Bob', 'email': 'bob@example.com'}<\/p>\n
    }<\/p>\n
    \u8bbf\u95ee\u6570\u636e\u5bf9\u8c61<\/strong><\/h2>\n
    user1_email = user_data['user1']['email']<\/p>\n
    print(user1_email)  # \u8f93\u51fa\uff1aalice@example.com<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    3. \u7f13\u5b58\u673a\u5236<\/h4>\n<\/p>\n
    \u5b57\u5178\u53ef\u4ee5\u7528\u4e8e\u5b9e\u73b0\u7b80\u5355\u7684\u7f13\u5b58\u673a\u5236\uff0c\u4ee5\u63d0\u9ad8\u6570\u636e\u8bbf\u95ee\u7684\u6548\u7387\uff1a<\/p>\n<\/p>\n
    # \u521b\u5efa\u4e00\u4e2a\u7f13\u5b58\u5b57\u5178<\/p>\n
    cache = {}<\/p>\n
    \u5b9a\u4e49\u4e00\u4e2a\u83b7\u53d6\u6570\u636e\u7684\u51fd\u6570\uff0c\u4f7f\u7528\u7f13\u5b58\u673a\u5236<\/strong><\/h2>\n
    def get_data(key):<\/p>\n
        if key in cache:<\/p>\n
            return cache[key]<\/p>\n
        else:<\/p>\n
            # \u6a21\u62df\u4ece\u6570\u636e\u5e93\u83b7\u53d6\u6570\u636e<\/p>\n
            data = f"Data for {key}"<\/p>\n
            cache[key] = data<\/p>\n
            return data<\/p>\n
    \u83b7\u53d6\u6570\u636e\u5e76\u7f13\u5b58<\/strong><\/h2>\n
    result1 = get_data('item1')<\/p>\n
    result2 = get_data('item1')<\/p>\n
    print(result1)  # \u8f93\u51fa\uff1aData for item1<\/p>\n
    print(result2)  # \u8f93\u51fa\uff1aData for item1<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u516b\u3001\u5b57\u5178\u7684\u6027\u80fd\u4f18\u5316<\/h3>\n<\/p>\n
    \u5728\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u65f6\uff0c\u5b57\u5178\u7684\u6027\u80fd\u4f18\u5316\u4e5f\u662f\u4e00\u4e2a\u91cd\u8981\u7684\u8003\u8651\u56e0\u7d20\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f18\u5316\u5b57\u5178\u6027\u80fd\u7684\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n
    1. \u9009\u62e9\u5408\u9002\u7684\u6570\u636e\u7ed3\u6784<\/h4>\n<\/p>\n
    \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528\u5176\u4ed6\u6570\u636e\u7ed3\u6784\uff08\u5982\u96c6\u5408\u3001\u5217\u8868\uff09\u53ef\u80fd\u4f1a\u6bd4\u5b57\u5178\u66f4\u9ad8\u6548\u3002\u4f8b\u5982\uff0c\u5982\u679c\u53ea\u9700\u8981\u5b58\u50a8\u552f\u4e00\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528\u96c6\u5408\uff08set<\/code>\uff09\u800c\u4e0d\u662f\u5b57\u5178\u3002<\/p>\n<\/p>\n
    2. \u907f\u514d\u4e0d\u5fc5\u8981\u7684\u590d\u5236<\/h4>\n<\/p>\n
    \u5728\u64cd\u4f5c\u5927\u89c4\u6a21\u5b57\u5178\u65f6\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u590d\u5236\u64cd\u4f5c\u3002\u5c3d\u91cf\u4f7f\u7528\u5f15\u7528\u800c\u4e0d\u662f\u521b\u5efa\u5b57\u5178\u7684\u526f\u672c\u3002<\/p>\n<\/p>\n
    3. \u4f7f\u7528\u751f\u6210\u5668\u8868\u8fbe\u5f0f<\/h4>\n<\/p>\n
    \u5728\u9700\u8981\u4ece\u5b57\u5178\u4e2d\u63d0\u53d6\u6570\u636e\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u751f\u6210\u5668\u8868\u8fbe\u5f0f\u6765\u63d0\u9ad8\u6548\u7387\u3002\u4f8b\u5982\uff0c\u4f7f\u7528\u751f\u6210\u5668\u8868\u8fbe\u5f0f\u6765\u8ba1\u7b97\u5b57\u5178\u4e2d\u503c\u7684\u603b\u548c\uff1a<\/p>\n<\/p>\n
    # \u521b\u5efa\u4e00\u4e2a\u5b57\u5178<\/p>\n
    data_dict = {'a': 1, 'b': 2, 'c': 3}<\/p>\n
    \u4f7f\u7528\u751f\u6210\u5668\u8868\u8fbe\u5f0f\u8ba1\u7b97\u503c\u7684\u603b\u548c<\/strong><\/h2>\n
    total = sum(value for value in data_dict.values())<\/p>\n
    print(total)  # \u8f93\u51fa\uff1a6<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    \u4e5d\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
    \u901a\u8fc7\u672c\u6587\u7684\u4ecb\u7ecd\uff0c\u6211\u4eec\u8be6\u7ec6\u4e86\u89e3\u4e86Python\u5982\u4f55\u5c06\u6570\u636e\u5b58\u50a8\u5230\u5b57\u5178\u4e2d\u7684\u5404\u79cd\u65b9\u6cd5\u548c\u6280\u5de7\u3002\u5b57\u5178\u4f5c\u4e3a\u4e00\u79cd\u7075\u6d3b\u4e14\u9ad8\u6548\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5728\u6570\u636e\u5b58\u50a8\u3001\u6570\u636e\u5904\u7406\u548c\u6570\u636e\u5206\u6790\u4e2d\u626e\u6f14\u7740\u91cd\u8981\u7684\u89d2\u8272\u3002\u65e0\u8bba\u662f\u7b80\u5355\u7684\u952e\u503c\u5bf9\u5b58\u50a8\uff0c\u8fd8\u662f\u590d\u6742\u7684\u5d4c\u5957\u5b57\u5178\u7ed3\u6784\uff0c\u5b57\u5178\u90fd\u80fd\u5e2e\u52a9\u6211\u4eec\u9ad8\u6548\u5730\u7ba1\u7406\u548c\u5904\u7406\u6570\u636e\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u7075\u6d3b\u8fd0\u7528\u5b57\u5178\u7684\u5404\u79cd\u65b9\u6cd5\u548c\u6280\u5de7\uff0c\u53ef\u4ee5\u5927\u5927\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u8fd0\u884c\u6548\u7387\u3002\u5e0c\u671b\u672c\u6587\u5bf9\u60a8\u5728Python\u7f16\u7a0b\u4e2d\u4f7f\u7528\u5b57\u5178\u6709\u6240\u5e2e\u52a9\u3002<\/p>\n<\/p>\n
    \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
     \u5982\u4f55\u5728Python\u4e2d\u521b\u5efa\u4e00\u4e2a\u5b57\u5178\u5e76\u6dfb\u52a0\u6570\u636e\uff1f<\/strong>
    \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u82b1\u62ec\u53f7 {}<\/code> \u6765\u521b\u5efa\u5b57\u5178\u3002\u6dfb\u52a0\u6570\u636e\u53ef\u4ee5\u4f7f\u7528\u952e\u503c\u5bf9\u7684\u5f62\u5f0f\uff0c\u952e\u4e0e\u503c\u4e4b\u95f4\u7528\u5192\u53f7 :<\/code> \u5206\u9694\uff0c\u591a\u4e2a\u952e\u503c\u5bf9\u7528\u9017\u53f7 ,<\/code> \u5206\u9694\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u8fd9\u6837\u521b\u5efa\u4e00\u4e2a\u5b57\u5178\u5e76\u6dfb\u52a0\u6570\u636e\uff1a  <\/p>\n
    my_dict = {'name': 'Alice', 'age': 30}\nmy_dict['city'] = 'New York'  # \u6dfb\u52a0\u65b0\u7684\u952e\u503c\u5bf9\n<\/code><\/pre>\n
    \u5b57\u5178\u4e2d\u5982\u4f55\u66f4\u65b0\u5df2\u6709\u7684\u6570\u636e\uff1f<\/strong>
    \u8981\u66f4\u65b0\u5b57\u5178\u4e2d\u5df2\u6709\u7684\u6570\u636e\uff0c\u53ea\u9700\u4f7f\u7528\u76f8\u5e94\u7684\u952e\u6765\u91cd\u65b0\u8d4b\u503c\u3002\u6bd4\u5982\uff0c\u5982\u679c\u60f3\u66f4\u65b0 age<\/code> \u7684\u503c\uff0c\u53ef\u4ee5\u8fd9\u6837\u505a\uff1a  <\/p>\n
    my_dict['age'] = 31  # \u66f4\u65b0 age \u7684\u503c\n<\/code><\/pre>\n
    \u8fd9\u6837\uff0c\u5b57\u5178 my_dict<\/code> \u4e2d\u7684 age<\/code> \u503c\u5c31\u53d8\u6210\u4e86 31\u3002<\/p>\n
    \u5728\u5b57\u5178\u4e2d\u5982\u4f55\u5220\u9664\u67d0\u4e2a\u952e\u503c\u5bf9\uff1f<\/strong>
    \u8981\u4ece\u5b57\u5178\u4e2d\u5220\u9664\u4e00\u4e2a\u952e\u503c\u5bf9\uff0c\u53ef\u4ee5\u4f7f\u7528 del<\/code> \u8bed\u53e5\u6216 pop()<\/code> \u65b9\u6cd5\u3002\u4f7f\u7528 del<\/code> \u53ef\u4ee5\u76f4\u63a5\u5220\u9664\u67d0\u4e2a\u952e\u503c\u5bf9\uff0c\u5982\u4e0b\u6240\u793a\uff1a  <\/p>\n
    del my_dict['city']  # \u5220\u9664 city \u952e\u53ca\u5176\u5bf9\u5e94\u7684\u503c\n<\/code><\/pre>\n
    \u4f7f\u7528 pop()<\/code> \u65b9\u6cd5\u4e0d\u4ec5\u53ef\u4ee5\u5220\u9664\u952e\u503c\u5bf9\uff0c\u8fd8\u80fd\u8fd4\u56de\u88ab\u5220\u9664\u7684\u503c\uff1a  <\/p>\n
    removed_value = my_dict.pop('age')  # \u5220\u9664 age \u952e\u5e76\u83b7\u53d6\u5176\u503c\n<\/code><\/pre>\n
    \u8fd9\u6837\uff0c\u5b57\u5178\u4e2d\u5c06\u4e0d\u518d\u6709 age<\/code> \u8fd9\u4e2a\u952e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python\u5c06\u6570\u636e\u5b58\u5230\u5b57\u5178\u4e2d\u7684\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528\u5b57\u5178\u7684\u952e\u503c\u5bf9\u5b58\u50a8\u3001\u4f7f\u7528update()\u65b9\u6cd5\u8fdb\u884c\u6279\u91cf\u66f4\u65b0\u3001\u4f7f\u7528defa […]","protected":false},"author":3,"featured_media":1033094,"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\/1033092"}],"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=1033092"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1033092\/revisions"}],"predecessor-version":[{"id":1033097,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1033092\/revisions\/1033097"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1033094"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1033092"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1033092"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1033092"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}