import os<\/p>\nimport stat<\/p>\n
def ensure_no_read_access(file_path):<\/p>\n
# \u83b7\u53d6\u6587\u4ef6\u5f53\u524d\u6743\u9650<\/p>\n
current_permissions = os.stat(file_path).st_mode<\/p>\n
# \u79fb\u9664\u8bfb\u53d6\u6743\u9650<\/p>\n
new_permissions = current_permissions & ~stat.S_IREAD<\/p>\n
os.chmod(file_path, new_permissions)<\/p>\n
ensure_no_read_access('example.txt')<\/p>\n
try:<\/p>\n
with open('example.txt', 'r') as file:<\/p>\n
content = file.read()<\/p>\n
except IOError:<\/p>\n
print("\u7531\u4e8e\u6743\u9650\u9650\u5236\uff0c\u6587\u4ef6\u65e0\u6cd5\u8bfb\u53d6")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528\u6587\u4ef6\u9501\u673a\u5236<\/h2>\n<\/p>\n
\u6587\u4ef6\u9501\u662f\u4e00\u79cd\u7528\u4e8e\u534f\u8c03\u5bf9\u6587\u4ef6\u7684\u8bbf\u95ee\u7684\u673a\u5236\uff0c\u53ef\u4ee5\u9632\u6b62\u591a\u4e2a\u8fdb\u7a0b\u540c\u65f6\u8bfb\u53d6\u6216\u4fee\u6539\u6587\u4ef6\u3002<\/p>\n<\/p>\n
fcntl\u6a21\u5757<\/h3>\n<\/p>\n
\u5728Unix\u7cfb\u7edf\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528fcntl<\/code>\u6a21\u5757\u6765\u5b9e\u73b0\u6587\u4ef6\u9501\u3002<\/p>\n<\/p>\nimport fcntl<\/p>\ndef lock_file(file):<\/p>\n
fcntl.flock(file, fcntl.LOCK_EX | fcntl.LOCK_NB)<\/p>\n
try:<\/p>\n
with open('example.txt', 'r') as file:<\/p>\n
lock_file(file)<\/p>\n
content = file.read()<\/p>\n
except BlockingIOError:<\/p>\n
print("\u6587\u4ef6\u88ab\u9501\u5b9a\uff0c\u65e0\u6cd5\u8bfb\u53d6")<\/p>\n
<\/code><\/pre>\n<\/p>\n
portalocker\u6a21\u5757<\/h3>\n<\/p>\n
\u5bf9\u4e8e\u8de8\u5e73\u53f0\u7684\u6587\u4ef6\u9501\u89e3\u51b3\u65b9\u6848\uff0c\u53ef\u4ee5\u4f7f\u7528\u7b2c\u4e09\u65b9\u5e93portalocker<\/code>\u3002<\/p>\n<\/p>\nimport portalocker<\/p>\ntry:<\/p>\n
with open('example.txt', 'r') as file:<\/p>\n
portalocker.lock(file, portalocker.LOCK_EX | portalocker.LOCK_NB)<\/p>\n
content = file.read()<\/p>\n
except portalocker.exceptions.LockException:<\/p>\n
print("\u6587\u4ef6\u88ab\u9501\u5b9a\uff0c\u65e0\u6cd5\u8bfb\u53d6")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u5982\u679c\u6587\u4ef6\u5df2\u7ecf\u88ab\u9501\u5b9a\uff0c\u7a0b\u5e8f\u5c06\u8f93\u51fa\u201c\u6587\u4ef6\u88ab\u9501\u5b9a\uff0c\u65e0\u6cd5\u8bfb\u53d6\u201d\u3002<\/p>\n<\/p>\n
\u56db\u3001\u5176\u4ed6\u9ad8\u7ea7\u65b9\u6cd5<\/h2>\n<\/p>\n
\u9664\u4e86\u4e0a\u8ff0\u65b9\u6cd5\uff0c\u8fd8\u6709\u4e00\u4e9b\u5176\u4ed6\u7684\u9ad8\u7ea7\u65b9\u6cd5\u53ef\u4ee5\u7528\u4e8e\u963b\u65ad\u6587\u4ef6\u8bfb\u53d6\u3002<\/p>\n<\/p>\n
\u4f7f\u7528\u5185\u5b58\u6620\u5c04\u6587\u4ef6<\/h3>\n<\/p>\n
\u5185\u5b58\u6620\u5c04\u6587\u4ef6\uff08Memory-mapped file\uff09\u662f\u4e00\u79cd\u5c06\u6587\u4ef6\u5185\u5bb9\u6620\u5c04\u5230\u5185\u5b58\u7684\u6280\u672f\u3002\u901a\u8fc7\u63a7\u5236\u5185\u5b58\u6620\u5c04\uff0c\u53ef\u4ee5\u5b9e\u73b0\u5bf9\u6587\u4ef6\u8bbf\u95ee\u7684\u63a7\u5236\u3002<\/p>\n<\/p>\n
import mmap<\/p>\nwith open('example.txt', 'r+b') as f:<\/p>\n
# \u6620\u5c04\u6587\u4ef6\u5230\u5185\u5b58<\/p>\n
mmapped_file = mmap.mmap(f.fileno(), 0)<\/p>\n
# \u8fdb\u884c\u8bfb\u53d6\u64cd\u4f5c<\/p>\n
try:<\/p>\n
data = mmapped_file.read()<\/p>\n
except ValueError:<\/p>\n
print("\u6587\u4ef6\u65e0\u6cd5\u8bfb\u53d6")<\/p>\n
finally:<\/p>\n
mmapped_file.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4f7f\u7528\u865a\u62df\u6587\u4ef6\u7cfb\u7edf<\/h3>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u865a\u62df\u6587\u4ef6\u7cfb\u7edf\uff08VFS\uff09\u6765\u9650\u5236\u6587\u4ef6\u7684\u8bfb\u53d6\u3002VFS\u5141\u8bb8\u5728\u4e0d\u4fee\u6539\u5e95\u5c42\u6587\u4ef6\u7cfb\u7edf\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\u6587\u4ef6\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
from pyfakefs.fake_filesystem_unittest import TestCase<\/p>\nclass FileAccessTest(TestCase):<\/p>\n
def setUp(self):<\/p>\n
self.setUpPyfakefs()<\/p>\n
# \u521b\u5efa\u865a\u62df\u6587\u4ef6<\/p>\n
self.fs.create_file('\/virtual\/file.txt', contents='Hello World')<\/p>\n
def test_file_access(self):<\/p>\n
with self.assertRaises(FileNotFoundError):<\/p>\n
with open('\/virtual\/file.txt', 'r') as file:<\/p>\n
content = file.read()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u4f7f\u7528pyfakefs<\/code>\u5e93\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u6d4b\u8bd5\u73af\u5883\u4e2d\u6a21\u62df\u6587\u4ef6\u7cfb\u7edf\u884c\u4e3a\uff0c\u963b\u65ad\u5b9e\u9645\u6587\u4ef6\u8bbf\u95ee\u3002<\/p>\n<\/p>\n\u4e94\u3001\u7ed3\u5408\u591a\u79cd\u65b9\u6cd5\u5b9e\u73b0\u590d\u6742\u63a7\u5236<\/h2>\n<\/p>\n
\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u7ed3\u5408\u591a\u79cd\u65b9\u6cd5\u6765\u5b9e\u73b0\u5bf9\u6587\u4ef6\u8bfb\u53d6\u7684\u590d\u6742\u63a7\u5236\u3002<\/p>\n<\/p>\n
\u7ed3\u5408\u6743\u9650\u548c\u9501\u673a\u5236<\/h3>\n<\/p>\n
\u901a\u8fc7\u7ed3\u5408\u6587\u4ef6\u6743\u9650\u548c\u6587\u4ef6\u9501\u673a\u5236\uff0c\u53ef\u4ee5\u5b9e\u73b0\u66f4\u5f3a\u7684\u8bbf\u95ee\u63a7\u5236\u3002<\/p>\n<\/p>\n
import os<\/p>\nimport stat<\/p>\n
import portalocker<\/p>\n
def secure_file_access(file_path):<\/p>\n
# \u79fb\u9664\u8bfb\u53d6\u6743\u9650<\/p>\n
current_permissions = os.stat(file_path).st_mode<\/p>\n
new_permissions = current_permissions & ~stat.S_IREAD<\/p>\n
os.chmod(file_path, new_permissions)<\/p>\n
try:<\/p>\n
with open(file_path, 'r') as file:<\/p>\n
portalocker.lock(file, portalocker.LOCK_EX | portalocker.LOCK_NB)<\/p>\n
content = file.read()<\/p>\n
except (IOError, portalocker.exceptions.LockException):<\/p>\n
print("\u6587\u4ef6\u65e0\u6cd5\u8bfb\u53d6\u6216\u5df2\u88ab\u9501\u5b9a")<\/p>\n
secure_file_access('example.txt')<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u52a8\u6001\u8c03\u6574\u6743\u9650\u5e76\u4f7f\u7528\u9501<\/h3>\n<\/p>\n
\u5728\u67d0\u4e9b\u573a\u666f\u4e0b\uff0c\u53ef\u80fd\u9700\u8981\u6839\u636e\u6761\u4ef6\u52a8\u6001\u8c03\u6574\u6587\u4ef6\u6743\u9650\uff0c\u5e76\u4e14\u5728\u8c03\u6574\u540e\u7acb\u5373\u4f7f\u7528\u9501\u673a\u5236\u3002<\/p>\n<\/p>\n
import os<\/p>\nimport stat<\/p>\n
import portalocker<\/p>\n
def conditional_file_access(file_path, condition):<\/p>\n
if condition():<\/p>\n
# \u52a8\u6001\u8c03\u6574\u6743\u9650<\/p>\n
current_permissions = os.stat(file_path).st_mode<\/p>\n
new_permissions = current_permissions & ~stat.S_IREAD<\/p>\n
os.chmod(file_path, new_permissions)<\/p>\n
try:<\/p>\n
with open(file_path, 'r') as file:<\/p>\n
portalocker.lock(file, portalocker.LOCK_EX | portalocker.LOCK_NB)<\/p>\n
content = file.read()<\/p>\n
except (IOError, portalocker.exceptions.LockException):<\/p>\n
print("\u6587\u4ef6\u65e0\u6cd5\u8bfb\u53d6\u6216\u5df2\u88ab\u9501\u5b9a")<\/p>\n
else:<\/p>\n
print("\u6761\u4ef6\u4e0d\u6ee1\u8db3\uff0c\u4e0d\u8fdb\u884c\u6587\u4ef6\u64cd\u4f5c")<\/p>\n
\u793a\u4f8b\u6761\u4ef6\u51fd\u6570<\/strong><\/h2>\ndef example_condition():<\/p>\n
return True<\/p>\n
conditional_file_access('example.txt', example_condition)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u53ef\u4ee5\u5b9e\u73b0\u5bf9\u6587\u4ef6\u8bbf\u95ee\u7684\u52a8\u6001\u63a7\u5236\uff0c\u6ee1\u8db3\u7279\u5b9a\u4e1a\u52a1\u9700\u6c42\u3002<\/p>\n<\/p>\n
\u7efc\u4e0a\u6240\u8ff0\uff0cPython\u63d0\u4f9b\u4e86\u591a\u79cd\u65b9\u6cd5\u6765\u963b\u65ad\u6587\u4ef6\u8bfb\u53d6\u64cd\u4f5c\uff0c\u5305\u62ec\u5f02\u5e38\u5904\u7406\u3001\u6743\u9650\u8bbe\u7f6e\u3001\u6587\u4ef6\u9501\u673a\u5236\u4ee5\u53ca\u5176\u4ed6\u9ad8\u7ea7\u65b9\u6cd5\u3002\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\uff0c\u751a\u81f3\u7ed3\u5408\u591a\u79cd\u65b9\u6cd5\u6765\u5b9e\u73b0\u590d\u6742\u7684\u6587\u4ef6\u8bbf\u95ee\u63a7\u5236\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n \u5982\u4f55\u5728Python\u4e2d\u5b9e\u73b0\u6587\u4ef6\u8bfb\u53d6\u7684\u963b\u65ad\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u6765\u963b\u65ad\u6587\u4ef6\u7684\u8bfb\u53d6\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528\u6587\u4ef6\u9501\u673a\u5236\uff0c\u8fd9\u6837\u5728\u4e00\u4e2a\u7ebf\u7a0b\u6216\u8fdb\u7a0b\u8bfb\u53d6\u6587\u4ef6\u65f6\uff0c\u5176\u4ed6\u7ebf\u7a0b\u6216\u8fdb\u7a0b\u65e0\u6cd5\u8bbf\u95ee\u8be5\u6587\u4ef6\u3002\u5e38\u7528\u7684\u6587\u4ef6\u9501\u5e93\u5305\u62ecfilelock<\/code>\u548cfcntl<\/code>\u3002\u4f7f\u7528\u8fd9\u4e9b\u5e93\u65f6\uff0c\u53ef\u4ee5\u786e\u4fdd\u5728\u6587\u4ef6\u88ab\u8bfb\u53d6\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5176\u4ed6\u64cd\u4f5c\u4e0d\u4f1a\u5e72\u6270\u5230\u6b63\u5728\u8fdb\u884c\u7684\u8bfb\u53d6\u4efb\u52a1\u3002<\/p>\n\u963b\u65ad\u6587\u4ef6\u8bfb\u53d6\u4f1a\u5bf9\u7a0b\u5e8f\u6027\u80fd\u4ea7\u751f\u5f71\u54cd\u5417\uff1f<\/strong>
\u662f\u7684\uff0c\u963b\u65ad\u6587\u4ef6\u8bfb\u53d6\u53ef\u80fd\u4f1a\u5f71\u54cd\u7a0b\u5e8f\u7684\u6027\u80fd\u3002\u5f53\u4e00\u4e2a\u8fdb\u7a0b\u88ab\u9501\u5b9a\u4ee5\u8bfb\u53d6\u6587\u4ef6\u65f6\uff0c\u5176\u4ed6\u5c1d\u8bd5\u8bbf\u95ee\u8be5\u6587\u4ef6\u7684\u8fdb\u7a0b\u4f1a\u88ab\u963b\u6b62\uff0c\u5bfc\u81f4\u7b49\u5f85\u65f6\u95f4\u589e\u52a0\u3002\u5728\u9ad8\u5e76\u53d1\u73af\u5883\u4e0b\uff0c\u8fd9\u79cd\u60c5\u51b5\u53ef\u80fd\u4f1a\u9020\u6210\u74f6\u9888\uff0c\u56e0\u6b64\u9700\u8981\u5408\u7406\u8bbe\u8ba1\u7a0b\u5e8f\u903b\u8f91\uff0c\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6027\u80fd\u635f\u5931\u3002<\/p>\n\u6709\u54ea\u4e9b\u5e38\u89c1\u7684\u573a\u666f\u9700\u8981\u963b\u65ad\u6587\u4ef6\u8bfb\u53d6\uff1f<\/strong>
\u5728\u4e00\u4e9b\u9700\u8981\u786e\u4fdd\u6570\u636e\u4e00\u81f4\u6027\u7684\u573a\u666f\u4e2d\uff0c\u963b\u65ad\u6587\u4ef6\u8bfb\u53d6\u662f\u5fc5\u8981\u7684\u3002\u4f8b\u5982\uff0c\u5728\u8fdb\u884c\u6570\u636e\u5907\u4efd\u65f6\uff0c\u9700\u8981\u786e\u4fdd\u5728\u5907\u4efd\u671f\u95f4\u6ca1\u6709\u5176\u4ed6\u8fdb\u7a0b\u5bf9\u6587\u4ef6\u8fdb\u884c\u4fee\u6539\u6216\u8bfb\u53d6\u3002\u6b64\u5916\uff0c\u5728\u5904\u7406\u654f\u611f\u4fe1\u606f\u65f6\uff0c\u4e5f\u53ef\u80fd\u5e0c\u671b\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u963b\u6b62\u6587\u4ef6\u7684\u8bfb\u53d6\u4ee5\u4fdd\u62a4\u6570\u636e\u5b89\u5168\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python\u963b\u65ad\u6587\u4ef6\u8bfb\u53d6\u7684\u65b9\u6cd5\u6709\uff1a\u901a\u8fc7\u5f02\u5e38\u5904\u7406\u963b\u6b62\u8bfb\u53d6\u3001\u4fee\u6539\u6587\u4ef6\u6743\u9650\u9650\u5236\u8bbf\u95ee\u3001\u4f7f\u7528\u6587\u4ef6\u9501\u673a\u5236\u3002 \u5728Python […]","protected":false},"author":3,"featured_media":1011357,"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\/1011349"}],"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=1011349"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1011349\/revisions"}],"predecessor-version":[{"id":1011359,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1011349\/revisions\/1011359"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1011357"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1011349"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1011349"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1011349"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
![\"python\u5982\u4f55\u963b\u65ad\u6587\u4ef6\u8bfb\u53d6\"](\"https:\/\/cdn-kb.worktile.com\/kb\/wp-content\/uploads\/2024\/04\/25085517\/a7826219-480a-48e8-ad4a-5be562ce92d7.webp\")
<\/p>\n