{"id":940387,"date":"2024-12-26T20:58:57","date_gmt":"2024-12-26T12:58:57","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/940387.html"},"modified":"2024-12-26T20:59:00","modified_gmt":"2024-12-26T12:59:00","slug":"python%e4%b8%ad%e5%a6%82%e4%bd%95%e6%b3%a8%e9%94%80","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/940387.html","title":{"rendered":"python\u4e2d\u5982\u4f55\u6ce8\u9500"},"content":{"rendered":"

\"python\u4e2d\u5982\u4f55\u6ce8\u9500\"<\/p>\n

\u5728Python\u4e2d\u6ce8\u9500\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528del<\/code>\u5173\u952e\u5b57\u5220\u9664\u5bf9\u8c61\u5f15\u7528\u3001\u4f7f\u7528None<\/code>\u89e3\u9664\u53d8\u91cf\u7684\u7ed1\u5b9a\u3001\u4f7f\u7528exit()<\/code>\u6216sys.exit()<\/code>\u7ec8\u6b62\u7a0b\u5e8f\u3001\u7ba1\u7406\u8d44\u6e90\u7684\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u3002<\/strong>\u5176\u4e2d\uff0c\u4f7f\u7528del<\/code>\u5173\u952e\u5b57\u5220\u9664\u5bf9\u8c61\u5f15\u7528\u662f\u6700\u5e38\u7528\u7684\u65b9\u6cd5\u3002del<\/code>\u5173\u952e\u5b57\u53ef\u4ee5\u5220\u9664\u5bf9\u5bf9\u8c61\u7684\u5f15\u7528\uff0c\u4f7f\u5176\u53ef\u4ee5\u88ab\u5783\u573e\u56de\u6536\u673a\u5236\u56de\u6536\uff0c\u4ece\u800c\u91ca\u653e\u5185\u5b58\u3002\u8be6\u7ec6\u6765\u8bf4\uff0cPython\u7684\u5783\u573e\u56de\u6536\u673a\u5236\u4f1a\u5728\u5bf9\u8c61\u7684\u5f15\u7528\u8ba1\u6570\u4e3a\u96f6\u65f6\u81ea\u52a8\u9500\u6bc1\u5bf9\u8c61\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u63a2\u8ba8Python\u4e2d\u6ce8\u9500\u7684\u4e0d\u540c\u65b9\u5f0f\u4ee5\u53ca\u5b83\u4eec\u7684\u5b9e\u9645\u5e94\u7528\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528del<\/code>\u5173\u952e\u5b57<\/h3>\n<\/p>\n

del<\/code>\u5173\u952e\u5b57\u5728Python\u4e2d\u7528\u4e8e\u5220\u9664\u5bf9\u5bf9\u8c61\u7684\u5f15\u7528\u3002\u5f53\u4e00\u4e2a\u5bf9\u8c61\u7684\u5f15\u7528\u8ba1\u6570\u964d\u5230\u96f6\u65f6\uff0cPython\u7684\u5783\u573e\u56de\u6536\u5668\u4f1a\u81ea\u52a8\u91ca\u653e\u8be5\u5bf9\u8c61\u5360\u7528\u7684\u5185\u5b58\u3002<\/p>\n<\/p>\n

1. \u5220\u9664\u53d8\u91cf<\/h4>\n<\/p>\n

\u5f53\u6211\u4eec\u4e0d\u518d\u9700\u8981\u67d0\u4e2a\u53d8\u91cf\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528del<\/code>\u5173\u952e\u5b57\u5220\u9664\u5b83\uff1a<\/p>\n<\/p>\n

x = 10<\/p>\n
del x<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u53d8\u91cfx<\/code>\u88ab\u5220\u9664\u3002\u5982\u679c\u4f60\u5c1d\u8bd5\u5728del<\/code>\u4e4b\u540e\u8bbf\u95eex<\/code>\uff0c\u5c06\u4f1a\u5f15\u53d1NameError<\/code>\uff0c\u56e0\u4e3ax<\/code>\u5728\u6b64\u4e4b\u540e\u4e0d\u518d\u5b58\u5728\u3002<\/p>\n<\/p>\n
2. \u5220\u9664\u5217\u8868\u5143\u7d20<\/h4>\n<\/p>\n
del<\/code>\u5173\u952e\u5b57\u8fd8\u53ef\u4ee5\u7528\u4e8e\u5220\u9664\u5217\u8868\u4e2d\u7684\u5143\u7d20\uff1a<\/p>\n<\/p>\n
numbers = [1, 2, 3, 4, 5]<\/p>\n
del numbers[2]<\/p>\n
print(numbers)  # \u8f93\u51fa: [1, 2, 4, 5]<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5217\u8868numbers<\/code>\u4e2d\u7684\u7b2c\u4e09\u4e2a\u5143\u7d20\uff08\u5373\u7d22\u5f15\u4e3a2\u7684\u5143\u7d20\uff09\u88ab\u5220\u9664\u3002<\/p>\n<\/p>\n
3. \u5220\u9664\u5b57\u5178\u4e2d\u7684\u952e\u503c\u5bf9<\/h4>\n<\/p>\n
\u540c\u6837\u5730\uff0cdel<\/code>\u5173\u952e\u5b57\u53ef\u4ee5\u7528\u4e8e\u5220\u9664\u5b57\u5178\u4e2d\u7684\u952e\u503c\u5bf9\uff1a<\/p>\n<\/p>\n
person = {'name': 'Alice', 'age': 25}<\/p>\n
del person['age']<\/p>\n
print(person)  # \u8f93\u51fa: {'name': 'Alice'}<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5b57\u5178person<\/code>\u4e2d\u7684\u952e'age'<\/code>\u53ca\u5176\u5bf9\u5e94\u7684\u503c\u88ab\u5220\u9664\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528None<\/code>\u89e3\u9664\u7ed1\u5b9a<\/h3>\n<\/p>\n
\u5c06\u53d8\u91cf\u8d4b\u503c\u4e3aNone<\/code>\uff0c\u53ef\u4ee5\u89e3\u9664\u53d8\u91cf\u4e0e\u5176\u4e4b\u524d\u5bf9\u8c61\u7684\u7ed1\u5b9a\uff0c\u8fd9\u6837\u53ef\u4ee5\u5e2e\u52a9\u5783\u573e\u56de\u6536\u5668\u66f4\u5feb\u5730\u56de\u6536\u5185\u5b58\u3002<\/p>\n<\/p>\n
x = [1, 2, 3]<\/p>\n
x = None<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5217\u8868\u5bf9\u8c61\u7684\u5f15\u7528\u88ab\u89e3\u9664\uff0c\u53d8\u91cfx<\/code>\u88ab\u8d4b\u503c\u4e3aNone<\/code>\u3002\u6b64\u65f6\uff0c\u5982\u679c\u6ca1\u6709\u5176\u4ed6\u5f15\u7528\u6307\u5411\u8fd9\u4e2a\u5217\u8868\u5bf9\u8c61\uff0c\u5b83\u5c06\u88ab\u5783\u573e\u56de\u6536\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528exit()<\/code>\u6216sys.exit()<\/code>\u7ec8\u6b62\u7a0b\u5e8f<\/h3>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u4f60\u53ef\u80fd\u9700\u8981\u5728\u7a0b\u5e8f\u6267\u884c\u8fc7\u7a0b\u4e2d\u7ec8\u6b62\u7a0b\u5e8f\u3002exit()<\/code>\u548csys.exit()<\/code>\u51fd\u6570\u53ef\u4ee5\u7528\u4e8e\u6b64\u76ee\u7684\u3002<\/p>\n<\/p>\n
1. \u4f7f\u7528exit()<\/code><\/h4>\n<\/p>\n
exit()<\/code>\u662fPython\u5185\u7f6e\u7684\u4e00\u4e2a\u51fd\u6570\uff0c\u7528\u4e8e\u9000\u51fa\u7a0b\u5e8f\uff1a<\/p>\n<\/p>\n
print("Program started")<\/p>\n
exit()<\/p>\n
print("This will not be printed")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u7a0b\u5e8f\u5728\u8c03\u7528exit()<\/code>\u540e\u7acb\u5373\u7ec8\u6b62\uff0c\u56e0\u6b64\u4e0d\u4f1a\u6267\u884c\u4e4b\u540e\u7684\u4ee3\u7801\u3002<\/p>\n<\/p>\n
2. \u4f7f\u7528sys.exit()<\/code><\/h4>\n<\/p>\n
sys.exit()<\/code>\u662fsys<\/code>\u6a21\u5757\u4e2d\u7684\u4e00\u4e2a\u51fd\u6570\uff0c\u7528\u4e8e\u9000\u51fa\u7a0b\u5e8f\u5e76\u8fd4\u56de\u4e00\u4e2a\u72b6\u6001\u7801\uff1a<\/p>\n<\/p>\n
import sys<\/p>\n
print("Program started")<\/p>\n
sys.exit(0)<\/p>\n
print("This will not be printed")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0eexit()<\/code>\u76f8\u4f3c\uff0csys.exit()<\/code>\u5728\u88ab\u8c03\u7528\u65f6\u4f1a\u7ec8\u6b62\u7a0b\u5e8f\u6267\u884c\u3002\u4e0d\u8fc7\uff0csys.exit()<\/code>\u5141\u8bb8\u4f60\u6307\u5b9a\u4e00\u4e2a\u72b6\u6001\u7801\uff0c\u901a\u5e380\u8868\u793a\u6210\u529f\u9000\u51fa\u3002<\/p>\n<\/p>\n
\u56db\u3001\u7ba1\u7406\u8d44\u6e90\u7684\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668<\/h3>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u81ea\u52a8\u7ba1\u7406\u8d44\u6e90\u7684\u521b\u5efa\u548c\u91ca\u653e\uff0c\u901a\u5e38\u7528\u4e8e\u6587\u4ef6\u64cd\u4f5c\u548c\u7f51\u7edc\u8fde\u63a5\u3002<\/p>\n<\/p>\n
1. \u4f7f\u7528with<\/code>\u8bed\u53e5\u7ba1\u7406\u6587\u4ef6\u8d44\u6e90<\/h4>\n<\/p>\n
with<\/code>\u8bed\u53e5\u53ef\u4ee5\u7528\u4e8e\u81ea\u52a8\u5173\u95ed\u6587\u4ef6\uff1a<\/p>\n<\/p>\n
with open('example.txt', 'r') as file:<\/p>\n
    content = file.read()<\/p>\n
    print(content)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728with<\/code>\u8bed\u53e5\u5757\u7ed3\u675f\u65f6\uff0c\u6587\u4ef6\u5bf9\u8c61\u4f1a\u81ea\u52a8\u5173\u95ed\uff0c\u65e0\u9700\u663e\u5f0f\u8c03\u7528close()<\/code>\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
2. \u81ea\u5b9a\u4e49\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668<\/h4>\n<\/p>\n
\u4f60\u8fd8\u53ef\u4ee5\u81ea\u5b9a\u4e49\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u6765\u7ba1\u7406\u5176\u4ed6\u7c7b\u578b\u7684\u8d44\u6e90\u3002\u8981\u5b9e\u73b0\u81ea\u5b9a\u4e49\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\uff0c\u9700\u8981\u5b9a\u4e49\u4e00\u4e2a\u7c7b\u5e76\u5b9e\u73b0__enter__()<\/code>\u548c__exit__()<\/code>\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n
class MyResource:<\/p>\n
    def __enter__(self):<\/p>\n
        print("Resource acquired")<\/p>\n
        return self<\/p>\n
    def __exit__(self, exc_type, exc_val, exc_tb):<\/p>\n
        print("Resource released")<\/p>\n
with MyResource() as resource:<\/p>\n
    print("Using the resource")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cMyResource<\/code>\u662f\u4e00\u4e2a\u81ea\u5b9a\u4e49\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u3002\u5728with<\/code>\u8bed\u53e5\u5757\u5f00\u59cb\u65f6\uff0c__enter__()<\/code>\u65b9\u6cd5\u88ab\u8c03\u7528\uff1b\u5728with<\/code>\u8bed\u53e5\u5757\u7ed3\u675f\u65f6\uff0c\u65e0\u8bba\u662f\u5426\u53d1\u751f\u5f02\u5e38\uff0c__exit__()<\/code>\u65b9\u6cd5\u90fd\u4f1a\u88ab\u8c03\u7528\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u6ce8\u9500\u5bf9\u8c61\u548c\u7ba1\u7406\u8d44\u6e90\u662f\u7a0b\u5e8f\u8bbe\u8ba1\u4e2d\u7684\u5e38\u89c1\u9700\u6c42\u3002\u901a\u8fc7\u4f7f\u7528del<\/code>\u5173\u952e\u5b57\u5220\u9664\u5bf9\u8c61\u5f15\u7528\u3001\u5c06\u53d8\u91cf\u8d4b\u503c\u4e3aNone<\/code>\u3001\u8c03\u7528exit()<\/code>\u6216sys.exit()<\/code>\u7ec8\u6b62\u7a0b\u5e8f\u3001\u4ee5\u53ca\u4f7f\u7528\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u7ba1\u7406\u8d44\u6e90\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u6709\u6548\u5730\u63a7\u5236\u7a0b\u5e8f\u7684\u5185\u5b58\u4f7f\u7528\u548c\u8d44\u6e90\u7ba1\u7406<\/a>\u3002\u7406\u89e3\u8fd9\u4e9b\u673a\u5236\u7684\u5de5\u4f5c\u539f\u7406\u548c\u5e94\u7528\u573a\u666f\uff0c\u5bf9\u4e8e\u7f16\u5199\u9ad8\u6548\u3001\u53ef\u9760\u7684Python\u4ee3\u7801\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5728Python\u4e2d\uff0c\u5982\u4f55\u5b89\u5168\u5730\u9000\u51fa\u7a0b\u5e8f\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528sys.exit()<\/code>\u51fd\u6570\u5b89\u5168\u5730\u9000\u51fa\u7a0b\u5e8f\u3002\u9996\u5148\uff0c\u9700\u8981\u5bfc\u5165sys<\/code>\u6a21\u5757\u3002\u8c03\u7528sys.exit()<\/code>\u65f6\uff0c\u53ef\u4ee5\u4f20\u5165\u4e00\u4e2a\u6574\u6570\u503c\u4f5c\u4e3a\u9000\u51fa\u72b6\u6001\u7801\uff0c0\u8868\u793a\u6b63\u5e38\u9000\u51fa\uff0c\u5176\u4ed6\u503c\u8868\u793a\u5f02\u5e38\u9000\u51fa\u3002\u786e\u4fdd\u5728\u9700\u8981\u7ed3\u675f\u7a0b\u5e8f\u7684\u5730\u65b9\u8c03\u7528\u6b64\u51fd\u6570\u3002<\/p>\n
Python\u4e2d\u662f\u5426\u6709\u7279\u5b9a\u7684\u6ce8\u9500\u547d\u4ee4\uff1f<\/strong>
Python\u5e76\u6ca1\u6709\u7279\u5b9a\u7684\u201c\u6ce8\u9500\u201d\u547d\u4ee4\u3002\u901a\u5e38\uff0c\u7a0b\u5e8f\u7684\u9000\u51fa\u662f\u901a\u8fc7\u7ec8\u6b62\u8fd0\u884c\u7684\u811a\u672c\u6765\u5b9e\u73b0\u7684\uff0c\u53ef\u4ee5\u901a\u8fc7exit()<\/code>\u3001quit()<\/code>\u7b49\u51fd\u6570\u6765\u8fbe\u5230\u76ee\u7684\u3002\u8fd9\u4e9b\u65b9\u6cd5\u90fd\u53ef\u4ee5\u5728\u4ea4\u4e92\u5f0f\u73af\u5883\u4e2d\u4f7f\u7528\uff0c\u4e5f\u53ef\u4ee5\u5728\u811a\u672c\u4e2d\u8c03\u7528\uff0c\u786e\u4fdd\u5728\u9002\u5f53\u7684\u65f6\u673a\u4f7f\u7528\uff0c\u4ee5\u907f\u514d\u6570\u636e\u4e22\u5931\u3002<\/p>\n
\u5982\u4f55\u5728Python\u4e2d\u5904\u7406\u6ce8\u9500\u65f6\u7684\u6e05\u7406\u5de5\u4f5c\uff1f<\/strong>
\u5728\u7a0b\u5e8f\u9000\u51fa\u524d\uff0c\u8fdb\u884c\u5fc5\u8981\u7684\u6e05\u7406\u5de5\u4f5c\u662f\u5f88\u91cd\u8981\u7684\u3002\u53ef\u4ee5\u4f7f\u7528try...finally<\/code>\u7ed3\u6784\u6765\u786e\u4fdd\u5728\u7a0b\u5e8f\u9000\u51fa\u524d\u5173\u95ed\u6587\u4ef6\u3001\u91ca\u653e\u8d44\u6e90\u6216\u4fdd\u5b58\u6570\u636e\u3002\u5728finally<\/code>\u5757\u4e2d\u7f16\u5199\u6e05\u7406\u4ee3\u7801\uff0c\u786e\u4fdd\u65e0\u8bba\u7a0b\u5e8f\u5982\u4f55\u9000\u51fa\uff0c\u90fd\u4f1a\u6267\u884c\u6b64\u90e8\u5206\u4ee3\u7801\uff0c\u4ee5\u4fdd\u8bc1\u8d44\u6e90\u7684\u6b63\u786e\u91ca\u653e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u4e2d\u6ce8\u9500\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528del\u5173\u952e\u5b57\u5220\u9664\u5bf9\u8c61\u5f15\u7528\u3001\u4f7f\u7528None\u89e3\u9664\u53d8\u91cf\u7684\u7ed1\u5b9a\u3001\u4f7f\u7528exit()\u6216sys […]","protected":false},"author":3,"featured_media":940389,"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\/940387"}],"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=940387"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/940387\/revisions"}],"predecessor-version":[{"id":940390,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/940387\/revisions\/940390"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/940389"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=940387"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=940387"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=940387"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}