{"id":1016967,"date":"2024-12-27T12:21:13","date_gmt":"2024-12-27T04:21:13","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1016967.html"},"modified":"2024-12-27T12:21:18","modified_gmt":"2024-12-27T04:21:18","slug":"python%e5%ad%97%e5%85%b8%e5%a6%82%e4%bd%95%e6%b7%bb%e5%8a%a0%e9%a1%b9","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1016967.html","title":{"rendered":"python\u5b57\u5178\u5982\u4f55\u6dfb\u52a0\u9879"},"content":{"rendered":"

\"python\u5b57\u5178\u5982\u4f55\u6dfb\u52a0\u9879\"<\/p>\n

\u4e00\u3001\u76f4\u63a5\u4f7f\u7528\u8d4b\u503c\u8bed\u53e5\u3001\u4f7f\u7528update()<\/code>\u65b9\u6cd5\u3001\u4f7f\u7528setdefault()<\/code>\u65b9\u6cd5<\/p>\n<\/p>\n

\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u76f4\u63a5\u4f7f\u7528\u8d4b\u503c\u8bed\u53e5\u3001\u4f7f\u7528update()<\/code>\u65b9\u6cd5\u3001\u4f7f\u7528setdefault()<\/code>\u65b9\u6cd5<\/strong>\u6765\u5411\u5b57\u5178\u6dfb\u52a0\u9879\u3002\u76f4\u63a5\u4f7f\u7528\u8d4b\u503c\u8bed\u53e5\u662f\u6700\u5e38\u7528\u548c\u76f4\u63a5\u7684\u65b9\u6cd5\uff0c\u5b83\u5141\u8bb8\u6211\u4eec\u4e3a\u5b57\u5178\u4e2d\u7684\u65b0\u952e\u5206\u914d\u4e00\u4e2a\u503c\uff0c\u4ece\u800c\u81ea\u52a8\u6dfb\u52a0\u8be5\u9879\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u6709\u4e00\u4e2a\u5b57\u5178my_dict<\/code>\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7my_dict['new_key'] = 'new_value'<\/code>\u6765\u6dfb\u52a0\u65b0\u9879\u3002\u8fd9\u6837\u505a\u7684\u597d\u5904\u662f\u7b80\u5355\u76f4\u89c2\uff0c\u5e76\u4e14\u53ef\u4ee5\u5728\u540c\u4e00\u8bed\u53e5\u4e2d\u521b\u5efa\u548c\u521d\u59cb\u5316\u65b0\u7684\u952e\u503c\u5bf9\u3002<\/p>\n<\/p>\n

\u4e8c\u3001\u76f4\u63a5\u4f7f\u7528\u8d4b\u503c\u8bed\u53e5<\/p>\n<\/p>\n

\u4f7f\u7528\u8d4b\u503c\u8bed\u53e5\u662f\u5411\u5b57\u5178\u4e2d\u6dfb\u52a0\u9879\u7684\u6700\u7b80\u5355\u65b9\u6cd5\u3002\u901a\u8fc7\u5c06\u65b0\u952e\u8bbe\u7f6e\u4e3a\u67d0\u4e2a\u503c\uff0cPython\u4f1a\u81ea\u52a8\u5c06\u8be5\u952e\u503c\u5bf9\u6dfb\u52a0\u5230\u5b57\u5178\u4e2d\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n

my_dict = {'name': 'Alice', 'age': 25}<\/p>\n
my_dict['city'] = 'New York'<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c'city'<\/code>\u4f5c\u4e3a\u65b0\u952e\u88ab\u6dfb\u52a0\u5230my_dict<\/code>\u4e2d\uff0c\u5e76\u8d4b\u4e88\u503c'New York'<\/code>\u3002\u8fd9\u79cd\u65b9\u6cd5\u4e0d\u9700\u8981\u4efb\u4f55\u989d\u5916\u7684\u51fd\u6570\u6216\u65b9\u6cd5\u8c03\u7528\uff0c\u56e0\u6b64\u5728\u4ee3\u7801\u4e2d\u663e\u5f97\u975e\u5e38\u7b80\u6d01\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528update()<\/code>\u65b9\u6cd5<\/p>\n<\/p>\n
update()<\/code>\u65b9\u6cd5\u5141\u8bb8\u6211\u4eec\u5c06\u53e6\u4e00\u4e2a\u5b57\u5178\u7684\u952e\u503c\u5bf9\u6dfb\u52a0\u5230\u73b0\u6709\u5b57\u5178\u4e2d\u3002\u8fd9\u5728\u9700\u8981\u540c\u65f6\u6dfb\u52a0\u591a\u4e2a\u952e\u503c\u5bf9\u65f6\u7279\u522b\u6709\u7528\u3002\u8fd9\u4e2a\u65b9\u6cd5\u4e5f\u53ef\u4ee5\u63a5\u53d7\u4e00\u4e2a\u53ef\u8fed\u4ee3\u7684\u952e\u503c\u5bf9\u5e8f\u5217\uff0c\u4f8b\u5982\u5217\u8868\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25}<\/p>\n
new_entries = {'city': 'New York', 'occupation': 'Engineer'}<\/p>\n
my_dict.update(new_entries)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u91cc\uff0cupdate()<\/code>\u65b9\u6cd5\u5c06new_entries<\/code>\u5b57\u5178\u4e2d\u7684\u6240\u6709\u9879\u6dfb\u52a0\u5230my_dict<\/code>\u4e2d\u3002\u8fd9\u6837\u7684\u65b9\u6cd5\u63d0\u4f9b\u4e86\u4e00\u79cd\u7b80\u4fbf\u7684\u65b9\u5f0f\u6765\u5408\u5e76\u5b57\u5178\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f7f\u7528setdefault()<\/code>\u65b9\u6cd5<\/p>\n<\/p>\n
setdefault()<\/code>\u65b9\u6cd5\u7528\u4e8e\u5728\u5b57\u5178\u4e2d\u6dfb\u52a0\u952e\u503c\u5bf9\uff0c\u5982\u679c\u952e\u4e0d\u5b58\u5728\u7684\u60c5\u51b5\u4e0b\u3002\u5b83\u8fd4\u56de\u6307\u5b9a\u952e\u7684\u503c\uff0c\u5982\u679c\u952e\u4e0d\u5b58\u5728\uff0c\u5219\u63d2\u5165\u952e\u5e76\u8bbe\u7f6e\u4e3a\u63d0\u4f9b\u7684\u503c\u3002\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
my_dict = {'name': 'Alice', 'age': 25}<\/p>\n
my_dict.setdefault('city', 'New York')<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u5982\u679c'city'<\/code>\u952e\u4e0d\u5b58\u5728\u4e8emy_dict<\/code>\u4e2d\uff0c\u5b83\u5c06\u88ab\u6dfb\u52a0\u5e76\u8d4b\u503c\u4e3a'New York'<\/code>\u3002\u5982\u679c\u952e\u5df2\u7ecf\u5b58\u5728\uff0csetdefault()<\/code>\u4e0d\u4f1a\u6539\u53d8\u5176\u503c\u3002\u8fd9\u4f7f\u5f97\u5b83\u6210\u4e3a\u4e00\u79cd\u5728\u786e\u4fdd\u5b57\u5178\u4e0d\u4f1a\u610f\u5916\u8986\u76d6\u73b0\u6709\u6570\u636e\u7684\u60c5\u51b5\u4e0b\u6dfb\u52a0\u65b0\u9879\u7684\u5b89\u5168\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u4f7f\u7528\u5b57\u5178\u63a8\u5bfc\u5f0f<\/p>\n<\/p>\n
\u5b57\u5178\u63a8\u5bfc\u5f0f\u63d0\u4f9b\u4e86\u4e00\u79cd\u521b\u5efa\u5b57\u5178\u7684\u7b80\u6d01\u65b9\u6cd5\uff0c\u7279\u522b\u662f\u5728\u9700\u8981\u4ece\u73b0\u6709\u7ed3\u6784\u8f6c\u6362\u6216\u8fc7\u6ee4\u6570\u636e\u65f6\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
keys = ['name', 'age', 'city']<\/p>\n
values = ['Alice', 25, 'New York']<\/p>\n
my_dict = {k: v for k, v in zip(keys, values)}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u5141\u8bb8\u6211\u4eec\u5728\u4e00\u884c\u4e2d\u521b\u5efa\u5e76\u521d\u59cb\u5316\u4e00\u4e2a\u5b57\u5178\uff0c\u975e\u5e38\u9002\u5408\u5904\u7406\u548c\u8f6c\u6362\u6570\u636e\u96c6\u3002<\/p>\n<\/p>\n
\u516d\u3001\u7ed3\u5408\u5217\u8868\u548c\u5b57\u5178<\/p>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u4f1a\u4ece\u5217\u8868\u4e2d\u6784\u5efa\u5b57\u5178\uff0c\u5e76\u9700\u8981\u52a8\u6001\u6dfb\u52a0\u9879\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
keys = ['name', 'age', 'city']<\/p>\n
values = ['Alice', 25, 'New York']<\/p>\n
my_dict = {}<\/p>\n
for k, v in zip(keys, values):<\/p>\n
    my_dict[k] = v<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u5229\u7528\u4e86zip\u51fd\u6570\u5c06\u4e24\u4e2a\u5217\u8868\u7ed3\u5408\u5728\u4e00\u8d77\uff0c\u5e76\u4f7f\u7528\u5faa\u73af\u9010\u9879\u6dfb\u52a0\u5230\u5b57\u5178\u4e2d\u3002<\/p>\n<\/p>\n
\u4e03\u3001\u4f7f\u7528fromkeys()<\/code>\u65b9\u6cd5<\/p>\n<\/p>\n
fromkeys()<\/code>\u65b9\u6cd5\u7528\u4e8e\u521b\u5efa\u4e00\u4e2a\u65b0\u5b57\u5178\uff0c\u5176\u4e2d\u7684\u952e\u6765\u81ea\u6307\u5b9a\u7684\u5e8f\u5217\uff0c\u503c\u5219\u662f\u540c\u4e00\u4e2a\u63d0\u4f9b\u7684\u503c\u3002\u8fd9\u5bf9\u4e8e\u521d\u59cb\u5316\u5b57\u5178\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
keys = ['name', 'age', 'city']<\/p>\n
my_dict = dict.fromkeys(keys, 'unknown')<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6240\u6709\u952e\u90fd\u88ab\u521d\u59cb\u5316\u4e3a\u76f8\u540c\u7684\u503c'unknown'<\/code>\u3002<\/p>\n<\/p>\n
\u516b\u3001\u52a8\u6001\u751f\u6210\u5b57\u5178\u9879<\/p>\n<\/p>\n
\u5728\u67d0\u4e9b\u9ad8\u7ea7\u5e94\u7528\u4e2d\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u6839\u636e\u67d0\u79cd\u903b\u8f91\u52a8\u6001\u751f\u6210\u5b57\u5178\u9879\u3002\u4f8b\u5982\uff0c\u6839\u636e\u67d0\u4e9b\u8ba1\u7b97\u7ed3\u679c\u6216\u6761\u4ef6\u6765\u6dfb\u52a0\u9879\uff1a<\/p>\n<\/p>\n
my_dict = {}<\/p>\n
for i in range(5):<\/p>\n
    my_dict[f'key_{i}'] = i * i<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u7528\u4e8e\u9700\u8981\u6839\u636e\u5faa\u73af\u6216\u6761\u4ef6\u751f\u6210\u5927\u91cf\u952e\u503c\u5bf9\u7684\u60c5\u51b5\u3002<\/p>\n<\/p>\n
\u4e5d\u3001\u786e\u4fdd\u5b57\u5178\u7684\u5b8c\u6574\u6027<\/p>\n<\/p>\n
\u5728\u5411\u5b57\u5178\u6dfb\u52a0\u9879\u65f6\uff0c\u786e\u4fdd\u6570\u636e\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u975e\u5e38\u91cd\u8981\u3002\u4f7f\u7528setdefault()<\/code>\u53ef\u4ee5\u907f\u514d\u8986\u76d6\u73b0\u6709\u6570\u636e\uff0c\u800c\u5728\u5408\u5e76\u5b57\u5178\u65f6\uff0cupdate()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u5728\u4e0d\u4e22\u5931\u6570\u636e\u7684\u60c5\u51b5\u4e0b\u6dfb\u52a0\u65b0\u9879\u3002<\/p>\n<\/p>\n
\u5341\u3001\u6027\u80fd\u8003\u8651<\/p>\n<\/p>\n
\u5728\u5904\u7406\u5927\u578b\u6570\u636e\u96c6\u6216\u9891\u7e41\u4fee\u6539\u5b57\u5178\u7684\u60c5\u51b5\u4e0b\uff0c\u6027\u80fd\u53ef\u80fd\u6210\u4e3a\u4e00\u4e2a\u95ee\u9898\u3002\u867d\u7136Python\u7684\u5b57\u5178\u5b9e\u73b0\u975e\u5e38\u9ad8\u6548\uff0c\u4f46\u5728\u6781\u7aef\u60c5\u51b5\u4e0b\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u548c\u7ed3\u6784\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u5b57\u5178\u4e2d\u6dfb\u52a0\u591a\u4e2a\u9879\uff1f<\/strong>
\u5728Python\u5b57\u5178\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u79cd\u65b9\u6cd5\u6dfb\u52a0\u591a\u4e2a\u9879\u3002\u5e38\u89c1\u7684\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528update()\u65b9\u6cd5\u3001\u901a\u8fc7\u5faa\u73af\u904d\u5386\u53e6\u4e00\u4e2a\u5b57\u5178\u3001\u6216\u8005\u76f4\u63a5\u6307\u5b9a\u952e\u503c\u5bf9\u3002\u4f8b\u5982\uff0c\u4f7f\u7528update()\u53ef\u4ee5\u5c06\u4e00\u4e2a\u5b57\u5178\u7684\u6240\u6709\u952e\u503c\u5bf9\u6dfb\u52a0\u5230\u53e6\u4e00\u4e2a\u5b57\u5178\u4e2d\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
dict1 = {'a': 1, 'b': 2}\ndict2 = {'c': 3, 'd': 4}\ndict1.update(dict2)\n<\/code><\/pre>\n
\u8fd9\u5c06\u4f7fdict1\u53d8\u4e3a{'a': 1, 'b': 2, 'c': 3, 'd': 4}\u3002<\/p>\n
\u5982\u4f55\u68c0\u67e5Python\u5b57\u5178\u4e2d\u662f\u5426\u5df2\u5b58\u5728\u67d0\u4e2a\u952e\uff1f<\/strong>
\u5728\u5904\u7406\u5b57\u5178\u65f6\uff0c\u786e\u8ba4\u952e\u662f\u5426\u5df2\u5b58\u5728\u975e\u5e38\u91cd\u8981\u3002\u53ef\u4ee5\u4f7f\u7528in<\/code>\u5173\u952e\u5b57\u6765\u68c0\u67e5\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u68c0\u67e5\u952e'c'\u662f\u5426\u5728\u5b57\u5178\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/p>\n
if 'c' in dict1:\n    print("\u952e'c'\u5df2\u5b58\u5728\u3002")\nelse:\n    print("\u952e'c'\u4e0d\u5b58\u5728\u3002")\n<\/code><\/pre>\n
\u8fd9\u6837\u53ef\u4ee5\u6709\u6548\u907f\u514d\u56e0\u91cd\u590d\u6dfb\u52a0\u800c\u5f15\u53d1\u7684\u9519\u8bef\u3002<\/p>\n
\u5728Python\u5b57\u5178\u4e2d\u6dfb\u52a0\u9879\u65f6\u662f\u5426\u53ef\u4ee5\u4f7f\u7528\u975e\u5b57\u7b26\u4e32\u7c7b\u578b\u7684\u952e\uff1f<\/strong>
\u662f\u7684\uff0cPython\u5b57\u5178\u5141\u8bb8\u4f7f\u7528\u591a\u79cd\u7c7b\u578b\u7684\u952e\uff0c\u5305\u62ec\u6574\u6570\u3001\u5143\u7ec4\u7b49\u3002\u5c3d\u7ba1\u5b57\u7b26\u4e32\u662f\u6700\u5e38\u7528\u7684\u952e\u7c7b\u578b\uff0c\u4f46\u53ea\u8981\u952e\u662f\u4e0d\u53ef\u53d8\u7684\uff08\u5982\u6570\u5b57\u3001\u5143\u7ec4\uff09\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528\u3002\u4f8b\u5982\uff1a<\/p>\n
my_dict = {1: 'one', (2, 3): 'two-three'}\nmy_dict[4] = 'four'  # \u4f7f\u7528\u6574\u6570\u4f5c\u4e3a\u952e\nmy_dict[(5, 6)] = 'five-six'  # \u4f7f\u7528\u5143\u7ec4\u4f5c\u4e3a\u952e\n<\/code><\/pre>\n
\u8fd9\u5c55\u793a\u4e86Python\u5b57\u5178\u7684\u7075\u6d3b\u6027\uff0c\u80fd\u591f\u9002\u5e94\u4e0d\u540c\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u4e00\u3001\u76f4\u63a5\u4f7f\u7528\u8d4b\u503c\u8bed\u53e5\u3001\u4f7f\u7528update()\u65b9\u6cd5\u3001\u4f7f\u7528setdefault()\u65b9\u6cd5 \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u76f4 […]","protected":false},"author":3,"featured_media":1016981,"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\/1016967"}],"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=1016967"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1016967\/revisions"}],"predecessor-version":[{"id":1016985,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1016967\/revisions\/1016985"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1016981"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1016967"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1016967"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1016967"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}