{"id":1032004,"date":"2024-12-31T11:30:03","date_gmt":"2024-12-31T03:30:03","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1032004.html"},"modified":"2024-12-31T11:30:06","modified_gmt":"2024-12-31T03:30:06","slug":"python%e5%bc%82%e5%b8%b8%e8%b7%b3%e5%87%ba%e5%a6%82%e4%bd%95%e5%85%b3%e9%97%ad%e7%9b%b8%e5%85%b3%e8%b5%84%e6%ba%90","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1032004.html","title":{"rendered":"python\u5f02\u5e38\u8df3\u51fa\u5982\u4f55\u5173\u95ed\u76f8\u5173\u8d44\u6e90"},"content":{"rendered":"

\"python\u5f02\u5e38\u8df3\u51fa\u5982\u4f55\u5173\u95ed\u76f8\u5173\u8d44\u6e90\"<\/p>\n

\u4e00\u3001\u4f7f\u7528try-finally\u7ed3\u6784<\/h3>\n<\/p>\n

\u4f7f\u7528try-finally\u7ed3\u6784\u3001\u786e\u4fdd\u8d44\u6e90\u5173\u95ed\u3001\u65e0\u8bba\u662f\u5426\u53d1\u751f\u5f02\u5e38<\/strong><\/p>\n<\/p>\n

\u5728Python\u7f16\u7a0b\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u9700\u8981\u6253\u5f00\u6587\u4ef6\u3001\u7f51\u7edc\u8fde\u63a5\u6216\u6570\u636e\u5e93\u8fde\u63a5\u7b49\u8d44\u6e90\u3002\u8fd9\u4e9b\u8d44\u6e90\u9700\u8981\u5728\u4f7f\u7528\u5b8c\u6210\u540e\u88ab\u5173\u95ed\uff0c\u4ee5\u91ca\u653e\u7cfb\u7edf\u8d44\u6e90\uff0c\u907f\u514d\u8d44\u6e90\u6cc4\u6f0f\u3002\u4e3a\u4e86\u786e\u4fdd\u8d44\u6e90\u5728\u53d1\u751f\u5f02\u5e38\u65f6\u4e5f\u80fd\u88ab\u6b63\u786e\u5173\u95ed\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528try-finally\u7ed3\u6784\u3002try-finally\u7ed3\u6784\u786e\u4fdd\u4e86\u65e0\u8bbatry\u5757\u4e2d\u662f\u5426\u53d1\u751f\u5f02\u5e38\uff0cfinally\u5757\u4e2d\u7684\u4ee3\u7801\u90fd\u4f1a\u88ab\u6267\u884c\uff0c\u56e0\u6b64\u53ef\u4ee5\u5728finally\u5757\u4e2d\u5173\u95ed\u8d44\u6e90\u3002<\/p>\n<\/p>\n

1.1 try-finally\u7684\u57fa\u672c\u7528\u6cd5<\/h4>\n<\/p>\n

try-finally\u7ed3\u6784\u7684\u57fa\u672c\u7528\u6cd5\u5982\u4e0b\uff1a<\/p>\n<\/p>\n

try:<\/p>\n
    # \u53ef\u80fd\u4f1a\u53d1\u751f\u5f02\u5e38\u7684\u4ee3\u7801<\/p>\n
finally:<\/p>\n
    # \u5173\u95ed\u8d44\u6e90\u7684\u4ee3\u7801<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6\u8fdb\u884c\u8bfb\u53d6\uff0c\u5e76\u786e\u4fdd\u65e0\u8bba\u662f\u5426\u53d1\u751f\u5f02\u5e38\uff0c\u6587\u4ef6\u90fd\u80fd\u88ab\u6b63\u786e\u5173\u95ed\uff1a<\/p>\n<\/p>\n
try:<\/p>\n
    file = open('example.txt', 'r')<\/p>\n
    data = file.read()<\/p>\n
    # \u53ef\u80fd\u4f1a\u53d1\u751f\u5f02\u5e38\u7684\u4ee3\u7801<\/p>\n
finally:<\/p>\n
    file.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u5373\u4f7f\u5728\u8bfb\u53d6\u6587\u4ef6\u65f6\u53d1\u751f\u5f02\u5e38\uff0cfinally\u5757\u4e2d\u7684file.close()\u4e5f\u4f1a\u88ab\u6267\u884c\uff0c\u4ece\u800c\u786e\u4fdd\u6587\u4ef6\u88ab\u6b63\u786e\u5173\u95ed\u3002<\/p>\n<\/p>\n
1.2 \u4f7f\u7528try-finally\u7ba1\u7406\u591a\u4e2a\u8d44\u6e90<\/h4>\n<\/p>\n
\u5f53\u6211\u4eec\u9700\u8981\u7ba1\u7406\u591a\u4e2a\u8d44\u6e90\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u591a\u4e2atry-finally\u7ed3\u6784\uff0c\u786e\u4fdd\u6bcf\u4e2a\u8d44\u6e90\u90fd\u80fd\u88ab\u6b63\u786e\u5173\u95ed\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u6253\u5f00\u4e24\u4e2a\u6587\u4ef6\uff0c\u5e76\u786e\u4fdd\u5b83\u4eec\u90fd\u80fd\u88ab\u6b63\u786e\u5173\u95ed\uff1a<\/p>\n<\/p>\n
try:<\/p>\n
    file1 = open('example1.txt', 'r')<\/p>\n
    try:<\/p>\n
        file2 = open('example2.txt', 'r')<\/p>\n
        data1 = file1.read()<\/p>\n
        data2 = file2.read()<\/p>\n
        # \u53ef\u80fd\u4f1a\u53d1\u751f\u5f02\u5e38\u7684\u4ee3\u7801<\/p>\n
    finally:<\/p>\n
        file2.close()<\/p>\n
finally:<\/p>\n
    file1.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u5d4c\u5957\u4f7f\u7528try-finally\u7ed3\u6784\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u4fdd\u6bcf\u4e2a\u6587\u4ef6\u90fd\u80fd\u88ab\u6b63\u786e\u5173\u95ed\uff0c\u5373\u4f7f\u5728\u8bfb\u53d6\u6587\u4ef6\u65f6\u53d1\u751f\u5f02\u5e38\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528with\u8bed\u53e5<\/h3>\n<\/p>\n
\u4f7f\u7528with\u8bed\u53e5\u3001\u7b80\u5316\u8d44\u6e90\u7ba1\u7406<\/a>\u3001\u81ea\u52a8\u5173\u95ed\u8d44\u6e90<\/strong><\/p>\n<\/p>\n
\u9664\u4e86\u4f7f\u7528try-finally\u7ed3\u6784\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528with\u8bed\u53e5\u6765\u7b80\u5316\u8d44\u6e90\u7ba1\u7406\u3002with\u8bed\u53e5\u662f\u4e00\u79cd\u4e0a\u4e0b\u6587\u7ba1\u7406\u534f\u8bae\uff0c\u5b83\u53ef\u4ee5\u81ea\u52a8\u7ba1\u7406\u8d44\u6e90\u7684\u6253\u5f00\u548c\u5173\u95ed\uff0c\u4f7f\u4ee3\u7801\u66f4\u7b80\u6d01\u3001\u66f4\u6613\u8bfb\u3002<\/p>\n<\/p>\n
2.1 with\u8bed\u53e5\u7684\u57fa\u672c\u7528\u6cd5<\/h4>\n<\/p>\n
with\u8bed\u53e5\u7684\u57fa\u672c\u7528\u6cd5\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
with expression as variable:<\/p>\n
    # \u4f7f\u7528\u8d44\u6e90\u7684\u4ee3\u7801<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u4f7f\u7528with\u8bed\u53e5\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6\u8fdb\u884c\u8bfb\u53d6\uff0c\u5e76\u786e\u4fdd\u6587\u4ef6\u5728\u4f7f\u7528\u5b8c\u6210\u540e\u81ea\u52a8\u5173\u95ed\uff1a<\/p>\n<\/p>\n
with open('example.txt', 'r') as file:<\/p>\n
    data = file.read()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0cwith\u8bed\u53e5\u4f1a\u81ea\u52a8\u8c03\u7528file\u5bf9\u8c61\u7684__enter__()\u65b9\u6cd5\u6253\u5f00\u6587\u4ef6\uff0c\u5e76\u5728\u79bb\u5f00with\u5757\u65f6\u81ea\u52a8\u8c03\u7528file\u5bf9\u8c61\u7684__exit__()\u65b9\u6cd5\u5173\u95ed\u6587\u4ef6\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u4e0d\u9700\u8981\u663e\u5f0f\u5730\u8c03\u7528file.close()\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
2.2 \u4f7f\u7528with\u8bed\u53e5\u7ba1\u7406\u591a\u4e2a\u8d44\u6e90<\/h4>\n<\/p>\n
with\u8bed\u53e5\u8fd8\u652f\u6301\u540c\u65f6\u7ba1\u7406\u591a\u4e2a\u8d44\u6e90\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u4f7f\u7528with\u8bed\u53e5\u540c\u65f6\u6253\u5f00\u4e24\u4e2a\u6587\u4ef6\uff0c\u5e76\u786e\u4fdd\u5b83\u4eec\u5728\u4f7f\u7528\u5b8c\u6210\u540e\u81ea\u52a8\u5173\u95ed\uff1a<\/p>\n<\/p>\n
with open('example1.txt', 'r') as file1, open('example2.txt', 'r') as file2:<\/p>\n
    data1 = file1.read()<\/p>\n
    data2 = file2.read()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u540c\u65f6\u7ba1\u7406\u591a\u4e2a\u8d44\u6e90\uff0cwith\u8bed\u53e5\u4f7f\u4ee3\u7801\u66f4\u7b80\u6d01\u3001\u66f4\u6613\u8bfb\uff0c\u5e76\u4e14\u786e\u4fdd\u6bcf\u4e2a\u8d44\u6e90\u90fd\u80fd\u88ab\u6b63\u786e\u5173\u95ed\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u81ea\u5b9a\u4e49\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668<\/h3>\n<\/p>\n
\u81ea\u5b9a\u4e49\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u3001\u5b9e\u73b0\u66f4\u590d\u6742\u7684\u8d44\u6e90\u7ba1\u7406\u3001\u4f7f\u7528with\u8bed\u53e5\u81ea\u52a8\u5173\u95ed\u8d44\u6e90<\/strong><\/p>\n<\/p>\n
\u6709\u65f6\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u7ba1\u7406\u66f4\u52a0\u590d\u6742\u7684\u8d44\u6e90\uff0c\u8fd9\u65f6\u53ef\u4ee5\u81ea\u5b9a\u4e49\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u3002\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u662f\u4e00\u4e2a\u5b9e\u73b0\u4e86__enter__()\u548c__exit__()\u65b9\u6cd5\u7684\u7c7b\u3002enter<\/strong>()\u65b9\u6cd5\u5728\u8fdb\u5165with\u5757\u65f6\u88ab\u8c03\u7528\uff0cexit<\/strong>()\u65b9\u6cd5\u5728\u79bb\u5f00with\u5757\u65f6\u88ab\u8c03\u7528\uff0c\u53ef\u4ee5\u7528\u4e8e\u5173\u95ed\u8d44\u6e90\u3002<\/p>\n<\/p>\n
3.1 \u5b9a\u4e49\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u7c7b<\/h4>\n<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e2a\u81ea\u5b9a\u4e49\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u7684\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
class ManagedResource:<\/p>\n
    def __enter__(self):<\/p>\n
        # \u521d\u59cb\u5316\u8d44\u6e90<\/p>\n
        self.resource = open('example.txt', 'r')<\/p>\n
        return self.resource<\/p>\n
    def __exit__(self, exc_type, exc_value, traceback):<\/p>\n
        # \u5173\u95ed\u8d44\u6e90<\/p>\n
        self.resource.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0cManagedResource\u7c7b\u5b9e\u73b0\u4e86__enter__()\u548c__exit__()\u65b9\u6cd5\uff0center<\/strong>()\u65b9\u6cd5\u7528\u4e8e\u521d\u59cb\u5316\u8d44\u6e90\u5e76\u8fd4\u56de\u8d44\u6e90\u5bf9\u8c61\uff0cexit<\/strong>()\u65b9\u6cd5\u7528\u4e8e\u5173\u95ed\u8d44\u6e90\u3002<\/p>\n<\/p>\n
3.2 \u4f7f\u7528\u81ea\u5b9a\u4e49\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668<\/h4>\n<\/p>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528with\u8bed\u53e5\u6765\u4f7f\u7528\u81ea\u5b9a\u4e49\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\uff1a<\/p>\n<\/p>\n
with ManagedResource() as resource:<\/p>\n
    data = resource.read()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0cwith\u8bed\u53e5\u4f1a\u81ea\u52a8\u8c03\u7528ManagedResource\u5bf9\u8c61\u7684__enter__()\u65b9\u6cd5\u521d\u59cb\u5316\u8d44\u6e90\uff0c\u5e76\u5728\u79bb\u5f00with\u5757\u65f6\u81ea\u52a8\u8c03\u7528__exit__()\u65b9\u6cd5\u5173\u95ed\u8d44\u6e90\u3002<\/p>\n<\/p>\n
3.3 \u7ba1\u7406\u591a\u4e2a\u8d44\u6e90\u7684\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668<\/h4>\n<\/p>\n
\u5982\u679c\u9700\u8981\u7ba1\u7406\u591a\u4e2a\u8d44\u6e90\uff0c\u53ef\u4ee5\u5728\u81ea\u5b9a\u4e49\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u4e2d\u540c\u65f6\u7ba1\u7406\u591a\u4e2a\u8d44\u6e90\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u5b9a\u4e49\u4e86\u4e00\u4e2a\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\uff0c\u7528\u4e8e\u540c\u65f6\u7ba1\u7406\u4e24\u4e2a\u6587\u4ef6\uff1a<\/p>\n<\/p>\n
class MultiResource:<\/p>\n
    def __enter__(self):<\/p>\n
        self.file1 = open('example1.txt', 'r')<\/p>\n
        self.file2 = open('example2.txt', 'r')<\/p>\n
        return self.file1, self.file2<\/p>\n
    def __exit__(self, exc_type, exc_value, traceback):<\/p>\n
        self.file1.close()<\/p>\n
        self.file2.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528with\u8bed\u53e5\u6765\u4f7f\u7528MultiResource\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\uff1a<\/p>\n<\/p>\n
with MultiResource() as (file1, file2):<\/p>\n
    data1 = file1.read()<\/p>\n
    data2 = file2.read()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u81ea\u5b9a\u4e49\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u66f4\u52a0\u590d\u6742\u7684\u8d44\u6e90\u7ba1\u7406\uff0c\u5e76\u4e14\u53ef\u4ee5\u4f7f\u7528with\u8bed\u53e5\u81ea\u52a8\u7ba1\u7406\u8d44\u6e90\u7684\u6253\u5f00\u548c\u5173\u95ed\u3002<\/p>\n<\/p>\n
\u56db\u3001\u5904\u7406\u5f02\u5e38\u5e76\u5173\u95ed\u8d44\u6e90<\/h3>\n<\/p>\n
\u5904\u7406\u5f02\u5e38\u3001\u5728finally\u5757\u4e2d\u5173\u95ed\u8d44\u6e90\u3001\u786e\u4fdd\u8d44\u6e90\u88ab\u6b63\u786e\u91ca\u653e<\/strong><\/p>\n<\/p>\n
\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u9700\u8981\u5904\u7406\u5f02\u5e38\u5e76\u5173\u95ed\u8d44\u6e90\u3002\u4e3a\u4e86\u786e\u4fdd\u8d44\u6e90\u88ab\u6b63\u786e\u91ca\u653e\uff0c\u6211\u4eec\u53ef\u4ee5\u5728finally\u5757\u4e2d\u5173\u95ed\u8d44\u6e90\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff0c\u6f14\u793a\u4e86\u5982\u4f55\u5728\u5904\u7406\u5f02\u5e38\u7684\u540c\u65f6\u5173\u95ed\u8d44\u6e90\uff1a<\/p>\n<\/p>\n
try:<\/p>\n
    file = open('example.txt', 'r')<\/p>\n
    data = file.read()<\/p>\n
except IOError as e:<\/p>\n
    print(f"An error occurred: {e}")<\/p>\n
finally:<\/p>\n
    file.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u5373\u4f7f\u5728\u8bfb\u53d6\u6587\u4ef6\u65f6\u53d1\u751fIOError\u5f02\u5e38\uff0cfinally\u5757\u4e2d\u7684file.close()\u4e5f\u4f1a\u88ab\u6267\u884c\uff0c\u4ece\u800c\u786e\u4fdd\u6587\u4ef6\u88ab\u6b63\u786e\u5173\u95ed\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u4f7f\u7528\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u88c5\u9970\u5668<\/h3>\n<\/p>\n
\u4f7f\u7528\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u88c5\u9970\u5668\u3001\u7b80\u5316\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u7684\u5b9a\u4e49\u3001\u81ea\u52a8\u7ba1\u7406\u8d44\u6e90<\/strong><\/p>\n<\/p>\n
Python\u8fd8\u63d0\u4f9b\u4e86contextlib\u6a21\u5757\uff0c\u5176\u4e2d\u5305\u542b\u4e86\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u88c5\u9970\u5668contextmanager\uff0c\u53ef\u4ee5\u7b80\u5316\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u7684\u5b9a\u4e49\u3002contextmanager\u88c5\u9970\u5668\u5c06\u4e00\u4e2a\u751f\u6210\u5668\u51fd\u6570\u8f6c\u6362\u4e3a\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u3002<\/p>\n<\/p>\n
5.1 \u4f7f\u7528contextmanager\u88c5\u9970\u5668<\/h4>\n<\/p>\n
\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528contextmanager\u88c5\u9970\u5668\u7684\u793a\u4f8b\uff1a<\/p>\n<\/p>\n
from contextlib import contextmanager<\/p>\n
@contextmanager<\/p>\n
def managed_resource():<\/p>\n
    resource = open('example.txt', 'r')<\/p>\n
    try:<\/p>\n
        yield resource<\/p>\n
    finally:<\/p>\n
        resource.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0cmanaged_resource\u751f\u6210\u5668\u51fd\u6570\u4f7f\u7528yield\u8bed\u53e5\u8fd4\u56de\u8d44\u6e90\u5bf9\u8c61\uff0c\u5e76\u5728finally\u5757\u4e2d\u5173\u95ed\u8d44\u6e90\u3002contextmanager\u88c5\u9970\u5668\u5c06\u8fd9\u4e2a\u751f\u6210\u5668\u51fd\u6570\u8f6c\u6362\u4e3a\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u3002<\/p>\n<\/p>\n
5.2 \u4f7f\u7528\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u88c5\u9970\u5668\u7ba1\u7406\u591a\u4e2a\u8d44\u6e90<\/h4>\n<\/p>\n
\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u88c5\u9970\u5668\u540c\u65f6\u7ba1\u7406\u591a\u4e2a\u8d44\u6e90\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u4f7f\u7528contextmanager\u88c5\u9970\u5668\u5b9a\u4e49\u4e86\u4e00\u4e2a\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\uff0c\u7528\u4e8e\u540c\u65f6\u7ba1\u7406\u4e24\u4e2a\u6587\u4ef6\uff1a<\/p>\n<\/p>\n
from contextlib import contextmanager<\/p>\n
@contextmanager<\/p>\n
def multi_resource():<\/p>\n
    file1 = open('example1.txt', 'r')<\/p>\n
    file2 = open('example2.txt', 'r')<\/p>\n
    try:<\/p>\n
        yield file1, file2<\/p>\n
    finally:<\/p>\n
        file1.close()<\/p>\n
        file2.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528with\u8bed\u53e5\u6765\u4f7f\u7528multi_resource\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\uff1a<\/p>\n<\/p>\n
with multi_resource() as (file1, file2):<\/p>\n
    data1 = file1.read()<\/p>\n
    data2 = file2.read()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u4f7f\u7528\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u88c5\u9970\u5668\uff0c\u6211\u4eec\u53ef\u4ee5\u7b80\u5316\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u7684\u5b9a\u4e49\uff0c\u5e76\u4e14\u53ef\u4ee5\u81ea\u52a8\u7ba1\u7406\u8d44\u6e90\u7684\u6253\u5f00\u548c\u5173\u95ed\u3002<\/p>\n<\/p>\n
\u516d\u3001\u7ed3\u5408\u4f7f\u7528\u591a\u79cd\u65b9\u6cd5<\/h3>\n<\/p>\n
\u7ed3\u5408\u4f7f\u7528try-finally\u7ed3\u6784\u3001with\u8bed\u53e5\u548c\u81ea\u5b9a\u4e49\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u3001\u786e\u4fdd\u8d44\u6e90\u88ab\u6b63\u786e\u5173\u95ed<\/strong><\/p>\n<\/p>\n
\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u7ed3\u5408\u4f7f\u7528try-finally\u7ed3\u6784\u3001with\u8bed\u53e5\u548c\u81ea\u5b9a\u4e49\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\uff0c\u786e\u4fdd\u8d44\u6e90\u88ab\u6b63\u786e\u5173\u95ed\u3002\u4f8b\u5982\uff0c\u4ee5\u4e0b\u4ee3\u7801\u6253\u5f00\u4e00\u4e2a\u6587\u4ef6\u8fdb\u884c\u8bfb\u53d6\uff0c\u5e76\u5728\u53d1\u751f\u5f02\u5e38\u65f6\u786e\u4fdd\u6587\u4ef6\u88ab\u6b63\u786e\u5173\u95ed\uff1a<\/p>\n<\/p>\n
from contextlib import contextmanager<\/p>\n
@contextmanager<\/p>\n
def managed_resource():<\/p>\n
    resource = open('example.txt', 'r')<\/p>\n
    try:<\/p>\n
        yield resource<\/p>\n
    finally:<\/p>\n
        resource.close()<\/p>\n
try:<\/p>\n
    with managed_resource() as file:<\/p>\n
        data = file.read()<\/p>\n
except IOError as e:<\/p>\n
    print(f"An error occurred: {e}")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u88c5\u9970\u5668\u5b9a\u4e49\u7684managed_resource\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\uff0c\u5e76\u5728with\u5757\u4e2d\u4f7f\u7528\u5b83\u6765\u7ba1\u7406\u6587\u4ef6\u8d44\u6e90\u3002\u5373\u4f7f\u5728\u8bfb\u53d6\u6587\u4ef6\u65f6\u53d1\u751fIOError\u5f02\u5e38\uff0cfinally\u5757\u4e2d\u7684resource.close()\u4e5f\u4f1a\u88ab\u6267\u884c\uff0c\u4ece\u800c\u786e\u4fdd\u6587\u4ef6\u88ab\u6b63\u786e\u5173\u95ed\u3002<\/p>\n<\/p>\n
\u4e03\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
\u5728Python\u7f16\u7a0b\u4e2d\uff0c\u786e\u4fdd\u8d44\u6e90\u88ab\u6b63\u786e\u5173\u95ed\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528try-finally\u7ed3\u6784\u3001with\u8bed\u53e5\u548c\u81ea\u5b9a\u4e49\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u6765\u7ba1\u7406\u8d44\u6e90\uff0c\u786e\u4fdd\u5728\u53d1\u751f\u5f02\u5e38\u65f6\u8d44\u6e90\u4e5f\u80fd\u88ab\u6b63\u786e\u5173\u95ed\u3002\u901a\u8fc7\u7ed3\u5408\u4f7f\u7528\u591a\u79cd\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u66f4\u52a0\u5065\u58ee\u548c\u53ef\u9760\u7684\u4ee3\u7801\uff0c\u907f\u514d\u8d44\u6e90\u6cc4\u6f0f\u548c\u5176\u4ed6\u6f5c\u5728\u95ee\u9898\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u5728Python\u4e2d\u5904\u7406\u5f02\u5e38\u4ee5\u786e\u4fdd\u8d44\u6e90\u88ab\u5173\u95ed\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528try...except...finally<\/code>\u7ed3\u6784\u6765\u5904\u7406\u5f02\u5e38\uff0c\u5e76\u786e\u4fdd\u5728\u51fa\u73b0\u5f02\u5e38\u65f6\u4ecd\u7136\u80fd\u591f\u5173\u95ed\u76f8\u5173\u8d44\u6e90\u3002\u5728finally<\/code>\u5757\u4e2d\u653e\u7f6e\u5173\u95ed\u8d44\u6e90\u7684\u4ee3\u7801\uff0c\u65e0\u8bba\u662f\u5426\u53d1\u751f\u5f02\u5e38\uff0c\u8fd9\u90e8\u5206\u4ee3\u7801\u90fd\u4f1a\u88ab\u6267\u884c\u3002\u4f8b\u5982\uff0c\u5982\u679c\u5728\u5904\u7406\u6587\u4ef6\u65f6\u53d1\u751f\u5f02\u5e38\uff0c\u53ef\u4ee5\u5728finally<\/code>\u4e2d\u5173\u95ed\u6587\u4ef6\u53e5\u67c4\u3002<\/p>\n
\u4f7f\u7528\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\u6709\u4ec0\u4e48\u4f18\u52bf\uff1f<\/strong>
\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\uff08\u4f7f\u7528with<\/code>\u8bed\u53e5\uff09\u662f\u5904\u7406\u8d44\u6e90\u7684\u4e00\u79cd\u4f18\u96c5\u65b9\u5f0f\uff0c\u5b83\u53ef\u4ee5\u81ea\u52a8\u7ba1\u7406\u8d44\u6e90\u7684\u83b7\u53d6\u548c\u91ca\u653e\u3002\u5f53\u4f7f\u7528with<\/code>\u8bed\u53e5\u6253\u5f00\u6587\u4ef6\u6216\u6570\u636e\u5e93\u8fde\u63a5\u65f6\uff0c\u5373\u4f7f\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\u53d1\u751f\u5f02\u5e38\uff0c\u8d44\u6e90\u4e5f\u4f1a\u88ab\u81ea\u52a8\u5173\u95ed\u3002\u8fd9\u79cd\u65b9\u5f0f\u4f7f\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u4e14\u6613\u4e8e\u7ef4\u62a4\u3002<\/p>\n
\u5982\u4f55\u786e\u4fdd\u5728\u81ea\u5b9a\u4e49\u5f02\u5e38\u5904\u7406\u4e2d\u5173\u95ed\u8d44\u6e90\uff1f<\/strong>
\u5728\u81ea\u5b9a\u4e49\u5f02\u5e38\u7c7b\u4e2d\uff0c\u53ef\u4ee5\u5728\u5f02\u5e38\u5904\u7406\u65f6\uff0c\u4f7f\u7528try...except<\/code>\u7ed3\u6784\u3002\u65e0\u8bba\u662f\u5728\u5904\u7406\u5f02\u5e38\u7684\u4ee3\u7801\u5757\u4e2d\uff0c\u8fd8\u662f\u5728\u5904\u7406\u5b8c\u6bd5\u540e\uff0c\u786e\u4fdd\u5728finally<\/code>\u5757\u4e2d\u5173\u95ed\u76f8\u5173\u8d44\u6e90\u3002\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdd\u5373\u4f7f\u5728\u5f02\u5e38\u53d1\u751f\u65f6\uff0c\u6240\u6709\u6253\u5f00\u7684\u8d44\u6e90\u90fd\u80fd\u591f\u5b89\u5168\u5173\u95ed\uff0c\u907f\u514d\u8d44\u6e90\u6cc4\u9732\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u4e00\u3001\u4f7f\u7528try-finally\u7ed3\u6784 \u4f7f\u7528try-finally\u7ed3\u6784\u3001\u786e\u4fdd\u8d44\u6e90\u5173\u95ed\u3001\u65e0\u8bba\u662f\u5426\u53d1\u751f\u5f02\u5e38 \u5728Pyth […]","protected":false},"author":3,"featured_media":1032014,"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\/1032004"}],"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=1032004"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1032004\/revisions"}],"predecessor-version":[{"id":1032017,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1032004\/revisions\/1032017"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1032014"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1032004"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1032004"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1032004"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}