{"id":981666,"date":"2024-12-27T07:04:29","date_gmt":"2024-12-26T23:04:29","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/981666.html"},"modified":"2024-12-27T07:04:31","modified_gmt":"2024-12-26T23:04:31","slug":"python%e8%bf%94%e5%9b%9e%e5%ad%97%e5%85%b8%e5%a6%82%e4%bd%95%e8%b0%83%e7%94%a8","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/981666.html","title":{"rendered":"python\u8fd4\u56de\u5b57\u5178\u5982\u4f55\u8c03\u7528"},"content":{"rendered":"

\"python\u8fd4\u56de\u5b57\u5178\u5982\u4f55\u8c03\u7528\"<\/p>\n

\u5728Python\u4e2d\uff0c\u8fd4\u56de\u5b57\u5178\u53ef\u4ee5\u901a\u8fc7\u8bbf\u95ee\u5b57\u5178\u7684\u952e\u6765\u8c03\u7528\u5176\u5bf9\u5e94\u7684\u503c\u3001\u4f7f\u7528get\u65b9\u6cd5\u6765\u5b89\u5168\u5730\u83b7\u53d6\u503c\u3001\u5229\u7528\u5b57\u5178\u7684\u65b9\u6cd5\u8fdb\u884c\u64cd\u4f5c<\/strong>\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\u8fd4\u56de\u5b57\u5178\uff0c\u7136\u540e\u6839\u636e\u9700\u8981\u8c03\u7528\u5b57\u5178\u4e2d\u7684\u5143\u7d20\u3002\u4e0b\u9762\u662f\u5bf9\u5982\u4f55\u8c03\u7528\u8fd4\u56de\u5b57\u5178\u7684\u4e00\u4e9b\u8be6\u7ec6\u4ecb\u7ecd\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u5b9a\u4e49\u8fd4\u56de\u5b57\u5178\u7684\u51fd\u6570<\/p>\n<\/p>\n

\u5728Python\u4e2d\uff0c\u5b57\u5178\u662f\u4e00\u79cd\u975e\u5e38\u5e38\u7528\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5b83\u4ee5\u952e\u503c\u5bf9\u7684\u5f62\u5f0f\u5b58\u50a8\u6570\u636e\u3002\u6211\u4eec\u53ef\u4ee5\u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\u6765\u8fd4\u56de\u5b57\u5178\uff0c\u8fd9\u6837\u5728\u8c03\u7528\u8be5\u51fd\u6570\u65f6\uff0c\u5c31\u53ef\u4ee5\u8f7b\u677e\u83b7\u53d6\u5b57\u5178\u5e76\u64cd\u4f5c\u5176\u4e2d\u7684\u6570\u636e\u3002<\/p>\n<\/p>\n

def create_person():<\/p>\n
    person = {<\/p>\n
        'name': 'Alice',<\/p>\n
        'age': 30,<\/p>\n
        'city': 'New York'<\/p>\n
    }<\/p>\n
    return person<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u51fd\u6570create_person<\/code>\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u4e2a\u4eba\u4fe1\u606f\u7684\u5b57\u5178\u3002\u5f53\u9700\u8981\u4f7f\u7528\u8fd9\u4e2a\u5b57\u5178\u65f6\uff0c\u53ef\u4ee5\u8c03\u7528\u8be5\u51fd\u6570\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u901a\u8fc7\u952e\u8bbf\u95ee\u5b57\u5178\u503c<\/p>\n<\/p>\n
\u4e00\u65e6\u6211\u4eec\u6709\u4e86\u4e00\u4e2a\u5b57\u5178\uff0c\u53ef\u4ee5\u901a\u8fc7\u952e\u6765\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\u3002\u8fd9\u662f\u6700\u5e38\u7528\u7684\u65b9\u5f0f\uff0c\u4e5f\u662f\u6700\u76f4\u63a5\u7684\u65b9\u5f0f\u3002<\/p>\n<\/p>\n
person = create_person()<\/p>\n
print(person['name'])  # \u8f93\u51fa: Alice<\/p>\n
print(person['age'])   # \u8f93\u51fa: 30<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u4f7f\u7528\u952e\u540d\uff0c\u53ef\u4ee5\u76f4\u63a5\u83b7\u53d6\u5bf9\u5e94\u7684\u503c\u3002\u8fd9\u79cd\u65b9\u5f0f\u8981\u6c42\u6211\u4eec\u77e5\u9053\u5b57\u5178\u4e2d\u5b58\u5728\u7684\u6240\u6709\u952e\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528get\u65b9\u6cd5\u5b89\u5168\u83b7\u53d6<\/p>\n<\/p>\n
\u6709\u65f6\u5019\uff0c\u6211\u4eec\u53ef\u80fd\u4e0d\u786e\u5b9a\u5b57\u5178\u4e2d\u662f\u5426\u5b58\u5728\u67d0\u4e2a\u952e\u3002\u4e3a\u4e86\u907f\u514d\u8bbf\u95ee\u4e0d\u5b58\u5728\u7684\u952e\u5bfc\u81f4\u7684\u9519\u8bef\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u7684get()<\/code>\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
age = person.get('age')<\/p>\n
print(age)  # \u8f93\u51fa: 30<\/p>\n
gender = person.get('gender', 'Not Specified')<\/p>\n
print(gender)  # \u8f93\u51fa: Not Specified<\/p>\n
<\/code><\/pre>\n<\/p>\n
get()<\/code>\u65b9\u6cd5\u5141\u8bb8\u6211\u4eec\u5728\u952e\u4e0d\u5b58\u5728\u65f6\u6307\u5b9a\u4e00\u4e2a\u9ed8\u8ba4\u503c\uff0c\u8fd9\u6837\u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u52a0\u5065\u58ee\u548c\u5b89\u5168\u3002<\/p>\n<\/p>\n
\u56db\u3001\u904d\u5386\u5b57\u5178<\/p>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u904d\u5386\u5b57\u5178\u4e2d\u7684\u6240\u6709\u952e\u503c\u5bf9\u3002Python\u63d0\u4f9b\u4e86\u591a\u79cd\u904d\u5386\u5b57\u5178\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
    \n
  1. \u904d\u5386\u952e<\/li>\n<\/ol>\n
    for key in person:<\/p>\n
        print(f'{key}: {person[key]}')<\/p>\n
    <\/code><\/pre>\n<\/p>\n
      \n
    1. \u904d\u5386\u952e\u503c\u5bf9<\/li>\n<\/ol>\n
      for key, value in person.items():<\/p>\n
          print(f'{key}: {value}')<\/p>\n
      <\/code><\/pre>\n<\/p>\n
        \n
      1. \u904d\u5386\u503c<\/li>\n<\/ol>\n
        for value in person.values():<\/p>\n
            print(value)<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        \u4e94\u3001\u66f4\u65b0\u5b57\u5178<\/p>\n<\/p>\n
        \u5728\u4f7f\u7528\u5b57\u5178\u65f6\uff0c\u53ef\u80fd\u9700\u8981\u66f4\u65b0\u5176\u4e2d\u7684\u67d0\u4e9b\u503c\u6216\u6dfb\u52a0\u65b0\u7684\u952e\u503c\u5bf9\u3002<\/p>\n<\/p>\n
        person['age'] = 31  # \u66f4\u65b0age\u952e\u7684\u503c<\/p>\n
        person['gender'] = 'Female'  # \u6dfb\u52a0\u65b0\u7684\u952e\u503c\u5bf9<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        \u5b57\u5178\u7684\u52a8\u6001\u6027\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\u7075\u6d3b\u5730\u4fee\u6539\u5176\u4e2d\u7684\u6570\u636e\u3002<\/p>\n<\/p>\n
        \u516d\u3001\u5220\u9664\u5b57\u5178\u9879<\/p>\n<\/p>\n
        \u5982\u679c\u9700\u8981\u5220\u9664\u5b57\u5178\u4e2d\u7684\u67d0\u4e2a\u952e\u503c\u5bf9\uff0c\u53ef\u4ee5\u4f7f\u7528del<\/code>\u5173\u952e\u5b57\u6216pop()<\/code>\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
        del person['city']  # \u5220\u9664city\u952e<\/p>\n
        \u6216\u8005\u4f7f\u7528pop\u65b9\u6cd5<\/strong><\/h2>\n
        age = person.pop('age')<\/p>\n
        print(age)  # \u8f93\u51fa: 31<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        \u4f7f\u7528pop()<\/code>\u65b9\u6cd5\u65f6\uff0c\u53ef\u4ee5\u83b7\u53d6\u88ab\u5220\u9664\u7684\u503c\u3002<\/p>\n<\/p>\n
        \u4e03\u3001\u5b57\u5178\u5408\u5e76\u4e0e\u66f4\u65b0<\/p>\n<\/p>\n
        \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528update()<\/code>\u65b9\u6cd5\u6216\u89e3\u6784\u8d4b\u503c\u7684\u65b9\u5f0f\u5408\u5e76\u4e24\u4e2a\u5b57\u5178\u3002<\/p>\n<\/p>\n
        extra_info = {'hobby': 'Reading', 'profession': 'Engineer'}<\/p>\n
        person.update(extra_info)<\/p>\n
        \u4f7f\u7528\u89e3\u6784<\/strong><\/h2>\n
        combined = {<strong>person, <\/strong>extra_info}<\/p>\n
        <\/code><\/pre>\n<\/p>\n
        \u5408\u5e76\u540e\u7684\u5b57\u5178\u5c06\u5305\u542b\u4e24\u4e2a\u5b57\u5178\u7684\u6240\u6709\u952e\u503c\u5bf9\u3002<\/p>\n<\/p>\n
        \u516b\u3001\u5b57\u5178\u7684\u5176\u4ed6\u64cd\u4f5c<\/p>\n<\/p>\n
          \n
        1. \u68c0\u67e5\u952e\u7684\u5b58\u5728<\/li>\n<\/ol>\n
          if 'name' in person:<\/p>\n
              print('Name is present in the dictionary.')<\/p>\n
          <\/code><\/pre>\n<\/p>\n
            \n
          1. \u83b7\u53d6\u5b57\u5178\u957f\u5ea6<\/li>\n<\/ol>\n
            length = len(person)<\/p>\n
            print(f'The dictionary has {length} items.')<\/p>\n
            <\/code><\/pre>\n<\/p>\n
              \n
            1. \u6e05\u7a7a\u5b57\u5178<\/li>\n<\/ol>\n
              person.clear()<\/p>\n
              <\/code><\/pre>\n<\/p>\n
              \u6e05\u7a7a\u540e\u7684\u5b57\u5178\u5c06\u4e0d\u5305\u542b\u4efb\u4f55\u5143\u7d20\u3002<\/p>\n<\/p>\n
              \u4e5d\u3001\u5b57\u5178\u7684\u5b9e\u9645\u5e94\u7528<\/p>\n<\/p>\n
              \u5b57\u5178\u5728Python\u4e2d\u6709\u5e7f\u6cdb\u7684\u5e94\u7528\uff0c\u4f8b\u5982\u5b58\u50a8\u914d\u7f6e\u4fe1\u606f\u3001\u5904\u7406JSON\u6570\u636e\u3001\u5b9e\u73b0\u5f00\u5173\u7ed3\u6784\u7b49\u3002\u5728\u5904\u7406\u590d\u6742\u6570\u636e\u65f6\uff0c\u5b57\u5178\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u4ee5\u4e00\u79cd\u6e05\u6670\u3001\u7ed3\u6784\u5316\u7684\u65b9\u5f0f\u7ec4\u7ec7\u6570\u636e\u3002<\/p>\n<\/p>\n
              \u4f8b\u5982\uff0c\u5728Web\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u5904\u7406\u7528\u6237\u63d0\u4ea4\u7684\u8868\u5355\u6570\u636e\uff0c\u8fd9\u4e9b\u6570\u636e\u901a\u5e38\u4ee5\u5b57\u5178\u5f62\u5f0f\u88ab\u63a5\u6536\u548c\u5904\u7406\u3002<\/p>\n<\/p>\n
              def process_form_data(form_data):<\/p>\n
                  user_name = form_data.get('username')<\/p>\n
                  emAI<\/a>l = form_data.get('email')<\/p>\n
                  # \u8fdb\u884c\u8fdb\u4e00\u6b65\u5904\u7406<\/p>\n
              <\/code><\/pre>\n<\/p>\n
              \u901a\u8fc7\u5b9a\u4e49\u51fd\u6570\u6765\u5904\u7406\u5b57\u5178\u6570\u636e\uff0c\u6211\u4eec\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u7ef4\u62a4\u6027\u3002<\/p>\n<\/p>\n
              \u5341\u3001\u603b\u7ed3<\/p>\n<\/p>\n
              Python\u4e2d\u7684\u5b57\u5178\u662f\u4e00\u79cd\u5f3a\u5927\u800c\u7075\u6d3b\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5141\u8bb8\u6211\u4eec\u4ee5\u952e\u503c\u5bf9\u7684\u5f62\u5f0f\u5b58\u50a8\u548c\u64cd\u4f5c\u6570\u636e\u3002\u901a\u8fc7\u5b9a\u4e49\u8fd4\u56de\u5b57\u5178\u7684\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5730\u83b7\u53d6\u548c\u8c03\u7528\u5b57\u5178\u4e2d\u7684\u6570\u636e\u3002\u4f7f\u7528\u952e\u8bbf\u95ee\u3001get()<\/code>\u65b9\u6cd5\u3001\u904d\u5386\u3001\u66f4\u65b0\u3001\u5220\u9664\u7b49\u591a\u79cd\u64cd\u4f5c\u65b9\u5f0f\uff0c\u6211\u4eec\u80fd\u591f\u7075\u6d3b\u5730\u7ba1\u7406\u548c\u5904\u7406\u5b57\u5178\u6570\u636e\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u5b57\u5178\u5e7f\u6cdb\u7528\u4e8e\u5404\u79cd\u573a\u666f\uff0c\u4f8b\u5982\u6570\u636e\u89e3\u6790\u3001\u914d\u7f6e\u7ba1\u7406\u3001\u72b6\u6001\u8ddf\u8e2a\u7b49\u3002\u4e86\u89e3\u5e76\u638c\u63e1\u5b57\u5178\u7684\u4f7f\u7528\u6280\u5de7\uff0c\u5c06\u6709\u52a9\u4e8e\u6211\u4eec\u7f16\u5199\u66f4\u52a0\u9ad8\u6548\u548c\u5065\u58ee\u7684Python\u7a0b\u5e8f\u3002<\/p>\n<\/p>\n
              \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
               \u5982\u4f55\u5728Python\u4e2d\u8fd4\u56de\u5b57\u5178\u5e76\u8c03\u7528\u5176\u503c\uff1f<\/strong>
              \u5728Python\u4e2d\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7\u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\u6765\u8fd4\u56de\u5b57\u5178\u3002\u4f8b\u5982\uff0c\u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\u5e76\u5728\u5176\u4e2d\u521b\u5efa\u4e00\u4e2a\u5b57\u5178\uff0c\u6700\u540e\u901a\u8fc7return\u8bed\u53e5\u8fd4\u56de\u8be5\u5b57\u5178\u3002\u5728\u8c03\u7528\u8fd9\u4e2a\u51fd\u6570\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7\u5b57\u5178\u7684\u952e\u6765\u8bbf\u95ee\u5176\u5bf9\u5e94\u7684\u503c\u3002<\/p>\n
              \u5982\u4f55\u5904\u7406\u8fd4\u56de\u7684\u5b57\u5178\u4e2d\u4e0d\u5b58\u5728\u7684\u952e\uff1f<\/strong>
              \u5f53\u4f60\u5c1d\u8bd5\u8bbf\u95ee\u4e00\u4e2a\u5b57\u5178\u4e2d\u4e0d\u5b58\u5728\u7684\u952e\u65f6\uff0c\u4f1a\u5f15\u53d1KeyError\u5f02\u5e38\u3002\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u5b57\u5178\u7684.get()\u65b9\u6cd5\uff0c\u5b83\u5141\u8bb8\u4f60\u6307\u5b9a\u4e00\u4e2a\u9ed8\u8ba4\u503c\uff0c\u5982\u679c\u952e\u4e0d\u5b58\u5728\u5219\u8fd4\u56de\u8be5\u9ed8\u8ba4\u503c\u3002<\/p>\n
              \u5728Python\u4e2d\u5982\u4f55\u5408\u5e76\u591a\u4e2a\u5b57\u5178\u5e76\u8fd4\u56de\uff1f<\/strong>
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