{"id":960844,"date":"2024-12-27T03:53:21","date_gmt":"2024-12-26T19:53:21","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/960844.html"},"modified":"2024-12-27T03:53:23","modified_gmt":"2024-12-26T19:53:23","slug":"python%e5%ad%97%e5%85%b8%e5%a6%82%e4%bd%95%e8%bf%94%e5%9b%9e%e8%af%a2%e9%97%ae","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/960844.html","title":{"rendered":"python\u5b57\u5178\u5982\u4f55\u8fd4\u56de\u8be2\u95ee"},"content":{"rendered":"

\"python\u5b57\u5178\u5982\u4f55\u8fd4\u56de\u8be2\u95ee\"<\/p>\n

\u5728Python\u4e2d\uff0c\u5b57\u5178\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u8fd4\u56de\u952e\u3001\u503c\u6216\u952e\u503c\u5bf9\uff0c\u5305\u62ec\u4f7f\u7528\u7279\u5b9a\u952e\u8bbf\u95ee\u503c\u3001\u4f7f\u7528get()<\/code>\u65b9\u6cd5\u3001\u5b89\u5168\u5730\u83b7\u53d6\u503c\u3001\u8fd4\u56de\u6240\u6709\u952e\u6216\u503c\u7684\u5217\u8868\u3001\u4ee5\u53ca\u8fed\u4ee3\u5b57\u5178\u7b49\u3002\u4f7f\u7528get()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u5b89\u5168\u5730\u83b7\u53d6\u503c\uff0c\u5373\u4f7f\u952e\u4e0d\u5b58\u5728\u4e5f\u4e0d\u4f1a\u62a5\u9519\u3002<\/strong><\/p>\n<\/p>\n

Python\u5b57\u5178\u662f\u4e00\u79cd\u5185\u7f6e\u7684\u6570\u636e\u7ed3\u6784\uff0c\u5141\u8bb8\u5b58\u50a8\u952e\u503c\u5bf9\uff0c\u7c7b\u4f3c\u4e8e\u4e00\u4e2a\u5c0f\u578b\u6570\u636e\u5e93\u3002\u5b57\u5178\u7684\u7075\u6d3b\u6027\u548c\u9ad8\u6548\u6027\u4f7f\u5176\u6210\u4e3aPython\u4e2d\u5904\u7406\u6570\u636e\u7684\u5e38\u7528\u5de5\u5177\u3002\u5728\u5b57\u5178\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u952e\u76f4\u63a5\u8bbf\u95ee\u5176\u5bf9\u5e94\u7684\u503c\uff0c\u8fd9\u79cd\u65b9\u6cd5\u88ab\u79f0\u4e3a\u201c\u952e\u8bbf\u95ee\u6cd5\u201d\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n

my_dict = {'name': 'Alice', 'age': 25}<\/p>\n
print(my_dict['name'])  # \u8f93\u51fa: Alice<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5982\u679c\u952e\u4e0d\u5b58\u5728\uff0c\u76f4\u63a5\u8bbf\u95ee\u4f1a\u629b\u51faKeyError<\/code>\u3002\u4e3a\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u53ef\u4ee5\u4f7f\u7528get()<\/code>\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n
name = my_dict.get('name', 'Unknown')<\/p>\n
print(name)  # \u8f93\u51fa: Alice<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u6df1\u5165\u63a2\u8ba8Python\u5b57\u5178\u7684\u5404\u79cd\u64cd\u4f5c\u6280\u5de7\u548c\u6700\u4f73\u5b9e\u8df5\u3002<\/p>\n<\/p>\n
\u4e00\u3001\u5b57\u5178\u57fa\u672c\u64cd\u4f5c<\/h3>\n<\/p>\n
1.1\u3001\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c<\/h4>\n<\/p>\n
\u5728\u5b57\u5178\u4e2d\uff0c\u8bbf\u95ee\u503c\u7684\u6700\u57fa\u672c\u65b9\u6cd5\u662f\u901a\u8fc7\u952e\u6765\u83b7\u53d6\u3002\u4f7f\u7528\u65b9\u62ec\u53f7[]<\/code>\u53ef\u4ee5\u76f4\u63a5\u83b7\u53d6\u952e\u5bf9\u5e94\u7684\u503c\uff1a<\/p>\n<\/p>\n
my_dict = {'fruit': 'apple', 'color': 'red'}<\/p>\n
fruit = my_dict['fruit']<\/p>\n
print(fruit)  # \u8f93\u51fa: apple<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5982\u679c\u952e\u4e0d\u5b58\u5728\uff0cPython\u5c06\u629b\u51faKeyError<\/code>\u3002\u4e3a\u4e86\u907f\u514d\u7a0b\u5e8f\u56e0\u9519\u8bef\u800c\u4e2d\u65ad\uff0c\u53ef\u4ee5\u4f7f\u7528get()<\/code>\u65b9\u6cd5\u6765\u5b89\u5168\u5730\u8bbf\u95ee\u503c\u3002<\/p>\n<\/p>\n
1.2\u3001\u4f7f\u7528get()<\/code>\u65b9\u6cd5<\/h4>\n<\/p>\n
get()<\/code>\u65b9\u6cd5\u5141\u8bb8\u5728\u952e\u4e0d\u5b58\u5728\u65f6\u8fd4\u56de\u4e00\u4e2a\u9ed8\u8ba4\u503c\uff0c\u4ece\u800c\u907f\u514dKeyError<\/code>\uff1a<\/p>\n<\/p>\n
fruit = my_dict.get('fruit', 'unknown')<\/p>\n
vegetable = my_dict.get('vegetable', 'unknown')<\/p>\n
print(fruit)  # \u8f93\u51fa: apple<\/p>\n
print(vegetable)  # \u8f93\u51fa: unknown<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u4fdd\u5728\u8bbf\u95ee\u5b57\u5178\u65f6\u4e0d\u4f1a\u56e0\u4e3a\u7f3a\u5c11\u952e\u800c\u5bfc\u81f4\u7a0b\u5e8f\u5d29\u6e83\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u5b57\u5178\u7684\u952e\u548c\u503c\u64cd\u4f5c<\/h3>\n<\/p>\n
2.1\u3001\u83b7\u53d6\u6240\u6709\u952e<\/h4>\n<\/p>\n
\u8981\u83b7\u53d6\u5b57\u5178\u4e2d\u6240\u6709\u7684\u952e\uff0c\u53ef\u4ee5\u4f7f\u7528keys()<\/code>\u65b9\u6cd5\u3002\u8fd9\u5c06\u8fd4\u56de\u4e00\u4e2a\u5b57\u5178\u89c6\u56fe\uff0c\u53ef\u4ee5\u88ab\u8f6c\u6362\u4e3a\u5217\u8868\uff1a<\/p>\n<\/p>\n
keys = my_dict.keys()<\/p>\n
print(list(keys))  # \u8f93\u51fa: ['fruit', 'color']<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u5728\u9700\u8981\u5bf9\u952e\u8fdb\u884c\u8fed\u4ee3\u6216\u68c0\u67e5\u65f6\u975e\u5e38\u6709\u7528\u3002<\/p>\n<\/p>\n
2.2\u3001\u83b7\u53d6\u6240\u6709\u503c<\/h4>\n<\/p>\n
\u7c7b\u4f3c\u5730\uff0c\u53ef\u4ee5\u4f7f\u7528values()<\/code>\u65b9\u6cd5\u6765\u83b7\u53d6\u5b57\u5178\u4e2d\u7684\u6240\u6709\u503c\uff1a<\/p>\n<\/p>\n
values = my_dict.values()<\/p>\n
print(list(values))  # \u8f93\u51fa: ['apple', 'red']<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u5728\u9700\u8981\u5bf9\u6240\u6709\u503c\u8fdb\u884c\u64cd\u4f5c\u65f6\u975e\u5e38\u6709\u5e2e\u52a9\u3002<\/p>\n<\/p>\n
2.3\u3001\u83b7\u53d6\u6240\u6709\u952e\u503c\u5bf9<\/h4>\n<\/p>\n
\u8981\u540c\u65f6\u83b7\u53d6\u6240\u6709\u952e\u548c\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528items()<\/code>\u65b9\u6cd5\uff0c\u5b83\u8fd4\u56de\u4e00\u4e2a\u5305\u542b\u952e\u503c\u5bf9\u7684\u89c6\u56fe\uff1a<\/p>\n<\/p>\n
items = my_dict.items()<\/p>\n
print(list(items))  # \u8f93\u51fa: [('fruit', 'apple'), ('color', 'red')]<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u4e2a\u65b9\u6cd5\u975e\u5e38\u9002\u5408\u5728\u5faa\u73af\u4e2d\u540c\u65f6\u8bbf\u95ee\u952e\u548c\u503c\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u5b57\u5178\u7684\u9ad8\u7ea7\u64cd\u4f5c<\/h3>\n<\/p>\n
3.1\u3001\u66f4\u65b0\u5b57\u5178<\/h4>\n<\/p>\n
\u5b57\u5178\u7684\u66f4\u65b0\u53ef\u4ee5\u901a\u8fc7\u8d4b\u503c\u64cd\u4f5c\u6216\u4f7f\u7528update()<\/code>\u65b9\u6cd5\u6765\u5b9e\u73b0\uff1a<\/p>\n<\/p>\n
my_dict['color'] = 'green'<\/p>\n
print(my_dict)  # \u8f93\u51fa: {'fruit': 'apple', 'color': 'green'}<\/p>\n
my_dict.update({'color': 'blue', 'shape': 'round'})<\/p>\n
print(my_dict)  # \u8f93\u51fa: {'fruit': 'apple', 'color': 'blue', 'shape': 'round'}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528update()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u540c\u65f6\u66f4\u65b0\u591a\u4e2a\u952e\u503c\u5bf9\uff0c\u975e\u5e38\u9ad8\u6548\u3002<\/p>\n<\/p>\n
3.2\u3001\u5220\u9664\u5b57\u5178\u5143\u7d20<\/h4>\n<\/p>\n
\u53ef\u4ee5\u4f7f\u7528del<\/code>\u5173\u952e\u5b57\u6216pop()<\/code>\u65b9\u6cd5\u6765\u5220\u9664\u5b57\u5178\u4e2d\u7684\u5143\u7d20\uff1a<\/p>\n<\/p>\n
del my_dict['shape']<\/p>\n
print(my_dict)  # \u8f93\u51fa: {'fruit': 'apple', 'color': 'blue'}<\/p>\n
color = my_dict.pop('color', 'not found')<\/p>\n
print(color)  # \u8f93\u51fa: blue<\/p>\n
print(my_dict)  # \u8f93\u51fa: {'fruit': 'apple'}<\/p>\n
<\/code><\/pre>\n<\/p>\n
pop()<\/code>\u65b9\u6cd5\u8fd8\u53ef\u4ee5\u8fd4\u56de\u88ab\u5220\u9664\u7684\u503c\uff0c\u5982\u679c\u952e\u4e0d\u5b58\u5728\u5219\u8fd4\u56de\u6307\u5b9a\u7684\u9ed8\u8ba4\u503c\u3002<\/p>\n<\/p>\n
\u56db\u3001\u5b57\u5178\u7684\u904d\u5386\u4e0e\u6761\u4ef6\u5904\u7406<\/h3>\n<\/p>\n
4.1\u3001\u5b57\u5178\u7684\u904d\u5386<\/h4>\n<\/p>\n
\u53ef\u4ee5\u901a\u8fc7\u5faa\u73af\u6765\u904d\u5386\u5b57\u5178\u7684\u952e\u3001\u503c\u6216\u952e\u503c\u5bf9\uff1a<\/p>\n<\/p>\n
for key in my_dict:<\/p>\n
    print(key, my_dict[key])<\/p>\n
for key, value in my_dict.items():<\/p>\n
    print(key, value)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u904d\u5386\u65b9\u5f0f\u4f7f\u5f97\u5b57\u5178\u64cd\u4f5c\u66f4\u52a0\u7075\u6d3b\u3002<\/p>\n<\/p>\n
4.2\u3001\u5b57\u5178\u7684\u6761\u4ef6\u5904\u7406<\/h4>\n<\/p>\n
\u5728\u5904\u7406\u5b57\u5178\u65f6\uff0c\u5e38\u5e38\u9700\u8981\u6839\u636e\u7279\u5b9a\u6761\u4ef6\u6765\u6267\u884c\u64cd\u4f5c\u3002\u4f8b\u5982\uff0c\u7b5b\u9009\u51fa\u503c\u6ee1\u8db3\u67d0\u4e2a\u6761\u4ef6\u7684\u952e\u503c\u5bf9\uff1a<\/p>\n<\/p>\n
filtered_dict = {k: v for k, v in my_dict.items() if v.startswith('a')}<\/p>\n
print(filtered_dict)  # \u8f93\u51fa: {'fruit': 'apple'}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u5b57\u5178\u63a8\u5bfc\u5f0f\u4f7f\u5f97\u6761\u4ef6\u5904\u7406\u66f4\u52a0\u7b80\u6d01\u548c\u9ad8\u6548\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u5b57\u5178\u7684\u5408\u5e76\u4e0e\u590d\u5236<\/h3>\n<\/p>\n
5.1\u3001\u5408\u5e76\u5b57\u5178<\/h4>\n<\/p>\n
\u5728Python 3.5\u53ca\u4ee5\u4e0a\u7248\u672c\uff0c\u53ef\u4ee5\u4f7f\u7528<\/code>\u64cd\u4f5c\u7b26\u6765\u5408\u5e76\u5b57\u5178\uff1a<\/p>\n<\/p>\n
dict1 = {'a': 1, 'b': 2}<\/p>\n
dict2 = {'b': 3, 'c': 4}<\/p>\n
merged_dict = {<strong>dict1, <\/strong>dict2}<\/p>\n
print(merged_dict)  # \u8f93\u51fa: {'a': 1, 'b': 3, 'c': 4}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u5f0f\u5728\u5904\u7406\u591a\u4e2a\u5b57\u5178\u5408\u5e76\u65f6\u975e\u5e38\u7b80\u4fbf\u3002<\/p>\n<\/p>\n
5.2\u3001\u590d\u5236\u5b57\u5178<\/h4>\n<\/p>\n
\u53ef\u4ee5\u4f7f\u7528copy()<\/code>\u65b9\u6cd5\u6216dict()<\/code>\u51fd\u6570\u6765\u590d\u5236\u5b57\u5178\uff1a<\/p>\n<\/p>\n
copy_dict = my_dict.copy()<\/p>\n
another_copy = dict(my_dict)<\/p>\n
print(copy_dict)  # \u8f93\u51fa: {'fruit': 'apple'}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u4e9b\u65b9\u6cd5\u90fd\u53ef\u4ee5\u5b9e\u73b0\u6d45\u590d\u5236\uff0c\u4f7f\u5f97\u5bf9\u526f\u672c\u7684\u4fee\u6539\u4e0d\u5f71\u54cd\u539f\u59cb\u5b57\u5178\u3002<\/p>\n<\/p>\n
\u516d\u3001\u5b57\u5178\u7684\u5185\u7f6e\u51fd\u6570\u4e0e\u65b9\u6cd5<\/h3>\n<\/p>\n
Python\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5185\u7f6e\u51fd\u6570\u548c\u65b9\u6cd5\uff0c\u4f7f\u5f97\u5b57\u5178\u64cd\u4f5c\u66f4\u52a0\u9ad8\u6548\u548c\u4fbf\u6377\u3002<\/p>\n<\/p>\n
6.1\u3001\u5185\u7f6e\u51fd\u6570<\/h4>\n<\/p>\n
    \n
  • len()<\/code>: \u8fd4\u56de\u5b57\u5178\u4e2d\u5143\u7d20\u7684\u6570\u91cf\u3002<\/li>\n
  • sorted()<\/code>: \u8fd4\u56de\u6309\u952e\u6392\u5e8f\u540e\u7684\u5b57\u5178\u89c6\u56fe\u3002<\/li>\n<\/ul>\n
    print(len(my_dict))  # \u8f93\u51fa: 1<\/p>\n
    print(sorted(my_dict))  # \u8f93\u51fa: ['fruit']<\/p>\n
    <\/code><\/pre>\n<\/p>\n
    6.2\u3001\u5185\u7f6e\u65b9\u6cd5<\/h4>\n<\/p>\n
      \n
    • clear()<\/code>: \u6e05\u7a7a\u5b57\u5178\u3002<\/li>\n
    • fromkeys()<\/code>: \u521b\u5efa\u4e00\u4e2a\u65b0\u5b57\u5178\u3002<\/li>\n<\/ul>\n
      my_dict.clear()<\/p>\n
      print(my_dict)  # \u8f93\u51fa: {}<\/p>\n
      new_dict = dict.fromkeys(['a', 'b'], 0)<\/p>\n
      print(new_dict)  # \u8f93\u51fa: {'a': 0, 'b': 0}<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u8fd9\u4e9b\u51fd\u6570\u548c\u65b9\u6cd5\u4f7f\u5f97\u5b57\u5178\u64cd\u4f5c\u66f4\u52a0\u7075\u6d3b\u548c\u9ad8\u6548\u3002<\/p>\n<\/p>\n
      \u4e03\u3001\u5b57\u5178\u7684\u6027\u80fd\u4f18\u5316<\/h3>\n<\/p>\n
      \u5b57\u5178\u5728Python\u4e2d\u4ee5\u5176\u9ad8\u6548\u7684\u67e5\u627e\u548c\u63d2\u5165\u6027\u80fd\u800c\u95fb\u540d\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f18\u5316\u5b57\u5178\u6027\u80fd\u7684\u6280\u5de7\uff1a<\/p>\n<\/p>\n
      7.1\u3001\u9009\u62e9\u5408\u9002\u7684\u952e<\/h4>\n<\/p>\n
      \u4f7f\u7528\u4e0d\u53ef\u53d8\u7c7b\u578b\uff08\u5982\u5b57\u7b26\u4e32\u3001\u5143\u7ec4\uff09\u4f5c\u4e3a\u952e\uff0c\u53ef\u4ee5\u63d0\u9ad8\u5b57\u5178\u7684\u6027\u80fd\u548c\u5b89\u5168\u6027\u3002<\/p>\n<\/p>\n
      7.2\u3001\u51cf\u5c11\u5b57\u5178\u7684\u5d4c\u5957<\/h4>\n<\/p>\n
      \u6df1\u5ea6\u5d4c\u5957\u7684\u5b57\u5178\u4f1a\u589e\u52a0\u8bbf\u95ee\u590d\u6742\u5ea6\uff0c\u5408\u7406\u8bbe\u8ba1\u5b57\u5178\u7ed3\u6784\uff0c\u5c3d\u91cf\u51cf\u5c11\u5d4c\u5957\u5c42\u7ea7\uff0c\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<\/p>\n
      7.3\u3001\u4f7f\u7528defaultdict<\/code><\/h4>\n<\/p>\n
      \u5f53\u5b57\u5178\u9700\u8981\u5904\u7406\u9ed8\u8ba4\u503c\u65f6\uff0c\u4f7f\u7528collections.defaultdict<\/code>\u53ef\u4ee5\u7b80\u5316\u4ee3\u7801\u5e76\u63d0\u9ad8\u6548\u7387\uff1a<\/p>\n<\/p>\n
      from collections import defaultdict<\/p>\n
      default_dict = defaultdict(int)<\/p>\n
      default_dict['key'] += 1<\/p>\n
      print(default_dict)  # \u8f93\u51fa: defaultdict(<class 'int'>, {'key': 1})<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u516b\u3001\u5b57\u5178\u7684\u5e94\u7528\u573a\u666f<\/h3>\n<\/p>\n
      \u5b57\u5178\u5728\u6570\u636e\u5904\u7406\u3001\u914d\u7f6e\u7ba1\u7406\u3001\u8ba1\u6570\u7edf\u8ba1\u7b49\u65b9\u9762\u6709\u7740\u5e7f\u6cdb\u5e94\u7528\u3002<\/p>\n<\/p>\n
      8.1\u3001\u6570\u636e\u5904\u7406<\/h4>\n<\/p>\n
      \u5728\u6570\u636e\u5904\u7406\u4e2d\uff0c\u5b57\u5178\u53ef\u4ee5\u7528\u4e8e\u5feb\u901f\u67e5\u627e\u548c\u5173\u8054\u6570\u636e\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u7528\u5b57\u5178\u6765\u5b58\u50a8\u5b66\u751f\u7684\u6210\u7ee9\uff0c\u5feb\u901f\u67e5\u627e\u67d0\u4e2a\u5b66\u751f\u7684\u5206\u6570\u3002<\/p>\n<\/p>\n
      8.2\u3001\u914d\u7f6e\u7ba1\u7406<\/h4>\n<\/p>\n
      \u5b57\u5178\u53ef\u4ee5\u7528\u4e8e\u5b58\u50a8\u548c\u7ba1\u7406\u5e94\u7528\u7a0b\u5e8f\u7684\u914d\u7f6e\u53c2\u6570\uff0c\u4f7f\u5f97\u914d\u7f6e\u7684\u8bfb\u53d6\u548c\u4fee\u6539\u66f4\u52a0\u65b9\u4fbf\u3002<\/p>\n<\/p>\n
      8.3\u3001\u8ba1\u6570\u7edf\u8ba1<\/h4>\n<\/p>\n
      \u5b57\u5178\u53ef\u4ee5\u7528\u4e8e\u7edf\u8ba1\u5143\u7d20\u7684\u51fa\u73b0\u6b21\u6570\uff0c\u975e\u5e38\u9002\u5408\u7528\u4e8e\u8bcd\u9891\u5206\u6790\u548c\u6570\u636e\u7edf\u8ba1\uff1a<\/p>\n<\/p>\n
      text = "hello world"<\/p>\n
      counter = defaultdict(int)<\/p>\n
      for char in text:<\/p>\n
          counter[char] += 1<\/p>\n
      print(counter)  # \u8f93\u51fa: defaultdict(<class 'int'>, {'h': 1, 'e': 1, 'l': 3, 'o': 2, ' ': 1, 'w': 1, 'r': 1, 'd': 1})<\/p>\n
      <\/code><\/pre>\n<\/p>\n
      \u901a\u8fc7\u4ee5\u4e0a\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u53ef\u4ee5\u770b\u51faPython\u5b57\u5178\u5728\u5904\u7406\u6570\u636e\u65f6\u7684\u5f3a\u5927\u529f\u80fd\u548c\u7075\u6d3b\u6027\u3002\u638c\u63e1\u8fd9\u4e9b\u6280\u5de7\u548c\u65b9\u6cd5\uff0c\u5c06\u5927\u5927\u63d0\u9ad8\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\u7684\u7f16\u7a0b\u6548\u7387\u548c\u4ee3\u7801\u8d28\u91cf\u3002<\/p>\n<\/p>\n
      \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
       \u5982\u4f55\u4f7f\u7528Python\u5b57\u5178\u83b7\u53d6\u503c\uff1f<\/strong>
      \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u952e\u6765\u8bbf\u95ee\u5b57\u5178\u4e2d\u7684\u503c\u3002\u4f7f\u7528\u65b9\u62ec\u53f7\u8bed\u6cd5\uff0c\u4f8b\u5982my_dict[key]<\/code>\uff0c\u53ef\u4ee5\u76f4\u63a5\u83b7\u53d6\u5bf9\u5e94\u952e\u7684\u503c\u3002\u5982\u679c\u952e\u4e0d\u5b58\u5728\uff0c\u5219\u4f1a\u5f15\u53d1KeyError<\/code>\u3002\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u53ef\u4ee5\u4f7f\u7528dict.get(key)<\/code>\u65b9\u6cd5\uff0c\u8fd9\u6837\u5728\u952e\u4e0d\u5b58\u5728\u65f6\u4f1a\u8fd4\u56deNone<\/code>\u6216\u60a8\u6307\u5b9a\u7684\u9ed8\u8ba4\u503c\u3002<\/p>\n
      \u5982\u4f55\u5224\u65ad\u4e00\u4e2a\u952e\u662f\u5426\u5728\u5b57\u5178\u4e2d\uff1f<\/strong>
      \u8981\u5224\u65ad\u67d0\u4e2a\u952e\u662f\u5426\u5b58\u5728\u4e8e\u5b57\u5178\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u3002\u4f8b\u5982\uff0cif key in my_dict:<\/code>\u5c06\u8fd4\u56deTrue<\/code>\u6216False<\/code>\uff0c\u6307\u793a\u8be5\u952e\u662f\u5426\u5728\u5b57\u5178\u4e2d\u3002\u8fd9\u662f\u4e00\u79cd\u5b89\u5168\u4e14\u9ad8\u6548\u7684\u65b9\u6cd5\uff0c\u907f\u514d\u4e86\u56e0\u76f4\u63a5\u8bbf\u95ee\u4e0d\u5b58\u5728\u7684\u952e\u800c\u5bfc\u81f4\u7684\u9519\u8bef\u3002<\/p>\n
      Python\u5b57\u5178\u662f\u5426\u53ef\u4ee5\u5b58\u50a8\u5176\u4ed6\u5b57\u5178\u6216\u590d\u6742\u6570\u636e\u7c7b\u578b\uff1f<\/strong>
      \u662f\u7684\uff0cPython\u5b57\u5178\u53ef\u4ee5\u5b58\u50a8\u5176\u4ed6\u5b57\u5178\u4f5c\u4e3a\u503c\uff0c\u8fd9\u6837\u53ef\u4ee5\u5b9e\u73b0\u5d4c\u5957\u5b57\u5178\u7684\u7ed3\u6784\u3002\u6b64\u5916\uff0c\u5b57\u5178\u8fd8\u53ef\u4ee5\u5b58\u50a8\u5217\u8868\u3001\u5143\u7ec4\u7b49\u590d\u6742\u6570\u636e\u7c7b\u578b\u3002\u8fd9\u79cd\u7075\u6d3b\u6027\u4f7f\u5f97\u5b57\u5178\u5728\u5904\u7406\u7ed3\u6784\u5316\u6570\u636e\u65f6\u975e\u5e38\u5f3a\u5927\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u5b57\u5178\uff0c\u5176\u4e2d\u4e00\u4e2a\u952e\u7684\u503c\u662f\u53e6\u4e00\u4e2a\u5b57\u5178\uff0c\u4ee5\u4fbf\u66f4\u597d\u5730\u7ec4\u7ec7\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\uff0c\u5b57\u5178\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u8fd4\u56de\u952e\u3001\u503c\u6216\u952e\u503c\u5bf9\uff0c\u5305\u62ec\u4f7f\u7528\u7279\u5b9a\u952e\u8bbf\u95ee\u503c\u3001\u4f7f\u7528get()\u65b9\u6cd5\u3001\u5b89\u5168\u5730\u83b7\u53d6 […]","protected":false},"author":3,"featured_media":960850,"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\/960844"}],"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=960844"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/960844\/revisions"}],"predecessor-version":[{"id":960852,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/960844\/revisions\/960852"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/960850"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=960844"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=960844"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=960844"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}