python文档自译：os模块-02【目录概览】
15.1.1. Process ParametersThese functions and data items provide information and operate on the current process and user.
15.1.1. 进程参数
这些函数和数据项，可为用户和当前进程，提供信息和操作。
15.1.2. File Object Creation
These functions create new file objects.
15.1.2. file对象的创建
这些函数，提供file对象的创建。
15.1.3. File Descriptor Operations
These functions operate on I/O streams referenced using file descriptors.
15.1.3. 文件描述操作
这些函数作用于引用IO流的文件描述符？！
15.1.3.1.open() flag constants
The following constants are options for the flags parameter to the open() function. They can be combined using the bitwise OR operator |. Some of them are not available on all platforms. For descriptions of their availability and use, consult the open(2) manual page on Unix or the MSDN on Windows.
15.1.4. Files and Directories
15.1.5. Process Management
These functions may be used to create and manage processes.
15.1.6. Miscellaneous System Information
15.1.7. Miscellaneous Functions
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