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		<title>Permissions on 春江暮客</title>
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				<title>Python 新建文件权限排查：umask、600 与拒绝覆盖</title>
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				<description>复现 Linux umask 对 Python 文件权限的影响，用标准库从创建时限制单个 JSON 输出，并验证已有文件和符号链接不会被覆盖。</description>
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