16. 通用操作系统服务
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本章中描述的各模块提供了在（几乎）所有的操作系统上可用的操作系统特性的
接口，例如文件和时钟。这些接口通常以 Unix 或 C 接口为参照对象设计，不
过在大多数其他系统上也可用。这里有一个概述：

* 16.1. "os" --- 操作系统接口模块

  * 16.1.1. 文件名，命令行参数，以及环境变量。

  * 16.1.2. 进程参数

  * 16.1.3. 创建文件对象

  * 16.1.4. 文件描述符操作

    * 16.1.4.1. Querying the size of a terminal

    * 16.1.4.2. Inheritance of File Descriptors

  * 16.1.5. Files and Directories

    * 16.1.5.1. Linux extended attributes

  * 16.1.6. Process Management

  * 16.1.7. Interface to the scheduler

  * 16.1.8. Miscellaneous System Information

  * 16.1.9. Random numbers

* 16.2. "io" --- 处理流的核心工具

  * 16.2.1. 概述

    * 16.2.1.1. Text I/O

    * 16.2.1.2. Binary I/O

    * 16.2.1.3. Raw I/O

  * 16.2.2. High-level Module Interface

    * 16.2.2.1. In-memory streams

  * 16.2.3. Class hierarchy

    * 16.2.3.1. I/O Base Classes

    * 16.2.3.2. Raw File I/O

    * 16.2.3.3. Buffered Streams

    * 16.2.3.4. Text I/O

  * 16.2.4. 性能

    * 16.2.4.1. Binary I/O

    * 16.2.4.2. Text I/O

    * 16.2.4.3. 多线程

    * 16.2.4.4. Reentrancy

* 16.3. "time" --- 时间的访问和转换

  * 16.3.1. 函数

  * 16.3.2. Clock ID 常量

  * 16.3.3. 时区常量

* 16.4. "argparse" --- 命令行选项、参数和子命令解析器

  * 16.4.1. 示例

    * 16.4.1.1. 创建一个解析器

    * 16.4.1.2. 添加参数

    * 16.4.1.3. 解析参数

  * 16.4.2. ArgumentParser 对象

    * 16.4.2.1. prog

    * 16.4.2.2. usage

    * 16.4.2.3. description

    * 16.4.2.4. epilog

    * 16.4.2.5. parents

    * 16.4.2.6. formatter_class

    * 16.4.2.7. prefix_chars

    * 16.4.2.8. fromfile_prefix_chars

    * 16.4.2.9. argument_default

    * 16.4.2.10. allow_abbrev

    * 16.4.2.11. conflict_handler

    * 16.4.2.12. add_help

  * 16.4.3. add_argument() 方法

    * 16.4.3.1. name or flags

    * 16.4.3.2. action

    * 16.4.3.3. nargs

    * 16.4.3.4. const

    * 16.4.3.5. default

    * 16.4.3.6. type

    * 16.4.3.7. 选择

    * 16.4.3.8. required

    * 16.4.3.9. help

    * 16.4.3.10. metavar

    * 16.4.3.11. dest

    * 16.4.3.12. Action classes

  * 16.4.4. The parse_args() method

    * 16.4.4.1. Option value syntax

    * 16.4.4.2. Invalid arguments

    * 16.4.4.3. Arguments containing "-"

    * 16.4.4.4. Argument abbreviations (prefix matching)

    * 16.4.4.5. Beyond "sys.argv"

    * 16.4.4.6. The Namespace object

  * 16.4.5. Other utilities

    * 16.4.5.1. Sub-commands

    * 16.4.5.2. FileType objects

    * 16.4.5.3. Argument groups

    * 16.4.5.4. Mutual exclusion

    * 16.4.5.5. Parser defaults

    * 16.4.5.6. Printing help

    * 16.4.5.7. Partial parsing

    * 16.4.5.8. Customizing file parsing

    * 16.4.5.9. Exiting methods

  * 16.4.6. Upgrading optparse code

* 16.5. "getopt" --- C-style parser for command line options

* 16.6. 模块 "logging" --- Python 的日志记录工具

  * 16.6.1. Logger 对象

  * 16.6.2. 日志级别

  * 16.6.3. Handler Objects

  * 16.6.4. Formatter Objects

  * 16.6.5. Filter Objects

  * 16.6.6. LogRecord Objects

  * 16.6.7. LogRecord attributes

  * 16.6.8. LoggerAdapter Objects

  * 16.6.9. 线程安全

  * 16.6.10. 模块级别函数

  * 16.6.11. Module-Level Attributes

  * 16.6.12. Integration with the warnings module

* 16.7. "logging.config" --- 日志记录配置

  * 16.7.1. Configuration functions

  * 16.7.2. Configuration dictionary schema

    * 16.7.2.1. Dictionary Schema Details

    * 16.7.2.2. Incremental Configuration

    * 16.7.2.3. Object connections

    * 16.7.2.4. User-defined objects

    * 16.7.2.5. Access to external objects

    * 16.7.2.6. Access to internal objects

    * 16.7.2.7. Import resolution and custom importers

  * 16.7.3. Configuration file format

* 16.8. "logging.handlers" --- Logging handlers

  * 16.8.1. StreamHandler

  * 16.8.2. FileHandler

  * 16.8.3. NullHandler

  * 16.8.4. WatchedFileHandler

  * 16.8.5. BaseRotatingHandler

  * 16.8.6. RotatingFileHandler

  * 16.8.7. TimedRotatingFileHandler

  * 16.8.8. SocketHandler

  * 16.8.9. DatagramHandler

  * 16.8.10. SysLogHandler

  * 16.8.11. NTEventLogHandler

  * 16.8.12. SMTPHandler

  * 16.8.13. MemoryHandler

  * 16.8.14. HTTPHandler

  * 16.8.15. QueueHandler

  * 16.8.16. QueueListener

* 16.9. "getpass" --- 便携式密码输入工具

* 16.10. "curses" --- 终端字符单元显示的处理

  * 16.10.1. 函数

  * 16.10.2. Window Objects

  * 16.10.3. 常量

* 16.11. "curses.textpad" --- Text input widget for curses programs

  * 16.11.1. 文本框对象

* 16.12. "curses.ascii" --- Utilities for ASCII characters

* 16.13. "curses.panel" --- A panel stack extension for curses

  * 16.13.1. 函数

  * 16.13.2. Panel Objects

* 16.14. "platform" ---  获取底层平台的标识数据

  * 16.14.1. 跨平台

  * 16.14.2. Java平台

  * 16.14.3. Windows平台

    * 16.14.3.1. Win95/98 specific

  * 16.14.4. Mac OS平台

  * 16.14.5. Unix Platforms

* 16.15. "errno" --- Standard errno system symbols

* 16.16. "ctypes" --- Python 的外部函数库

  * 16.16.1. ctypes 教程

    * 16.16.1.1. 载入动态连接库

    * 16.16.1.2. 操作导入的动态链接库中的函数

    * 16.16.1.3. 调用函数

    * 16.16.1.4. 基础数据类型

    * 16.16.1.5. 调用函数，继续

    * 16.16.1.6. 使用自定义的数据类型调用函数

    * 16.16.1.7. Specifying the required argument types (function
      prototypes)

    * 16.16.1.8. Return types

    * 16.16.1.9. Passing pointers (or: passing parameters by
      reference)

    * 16.16.1.10. Structures and unions

    * 16.16.1.11. Structure/union alignment and byte order

    * 16.16.1.12. Bit fields in structures and unions

    * 16.16.1.13. Arrays

    * 16.16.1.14. Pointers

    * 16.16.1.15. Type conversions

    * 16.16.1.16. Incomplete Types

    * 16.16.1.17. Callback functions

    * 16.16.1.18. Accessing values exported from dlls

    * 16.16.1.19. Surprises

    * 16.16.1.20. Variable-sized data types

  * 16.16.2. ctypes reference

    * 16.16.2.1. Finding shared libraries

    * 16.16.2.2. Loading shared libraries

    * 16.16.2.3. Foreign functions

    * 16.16.2.4. Function prototypes

    * 16.16.2.5. Utility functions

    * 16.16.2.6. Data types

    * 16.16.2.7. 基础数据类型

    * 16.16.2.8. Structured data types

    * 16.16.2.9. Arrays and pointers
