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GeezerVison is showing docs.python.org — 15. Generic Operating System Services — Python 2.7.18 documentation

This document is for an old version of Python that is no longer supported. You should upgrade and read the Python documentation for the current stable release.

15. Generic Operating System Services¶

The modules described in this chapter provide interfaces to operating system features that are available on (almost) all operating systems, such as files and a clock. The interfaces are generally modeled after the Unix or C interfaces, but they are available on most other systems as well. Here’s an overview:

  • 15.1. os — Miscellaneous operating system interfaces
    • 15.1.1. Process Parameters
    • 15.1.2. File Object Creation
    • 15.1.3. File Descriptor Operations
      • 15.1.3.1. open() flag constants
    • 15.1.4. Files and Directories
    • 15.1.5. Process Management
    • 15.1.6. Miscellaneous System Information
    • 15.1.7. Miscellaneous Functions
  • 15.2. io — Core tools for working with streams
    • 15.2.1. Module Interface
    • 15.2.2. I/O Base Classes
    • 15.2.3. Raw File I/O
    • 15.2.4. Buffered Streams
    • 15.2.5. Text I/O
    • 15.2.6. Advanced topics
      • 15.2.6.1. Performance
        • 15.2.6.1.1. Binary I/O
        • 15.2.6.1.2. Text I/O
      • 15.2.6.2. Multi-threading
      • 15.2.6.3. Reentrancy
  • 15.3. time — Time access and conversions
  • 15.4. argparse — Parser for command-line options, arguments and sub-commands
    • 15.4.1. Example
      • 15.4.1.1. Creating a parser
      • 15.4.1.2. Adding arguments
      • 15.4.1.3. Parsing arguments
    • 15.4.2. ArgumentParser objects
      • 15.4.2.1. prog
      • 15.4.2.2. usage
      • 15.4.2.3. description
      • 15.4.2.4. epilog
      • 15.4.2.5. parents
      • 15.4.2.6. formatter_class
      • 15.4.2.7. prefix_chars
      • 15.4.2.8. fromfile_prefix_chars
      • 15.4.2.9. argument_default
      • 15.4.2.10. conflict_handler
      • 15.4.2.11. add_help
    • 15.4.3. The add_argument() method
      • 15.4.3.1. name or flags
      • 15.4.3.2. action
      • 15.4.3.3. nargs
      • 15.4.3.4. const
      • 15.4.3.5. default
      • 15.4.3.6. type
      • 15.4.3.7. choices
      • 15.4.3.8. required
      • 15.4.3.9. help
      • 15.4.3.10. metavar
      • 15.4.3.11. dest
      • 15.4.3.12. Action classes
    • 15.4.4. The parse_args() method
      • 15.4.4.1. Option value syntax
      • 15.4.4.2. Invalid arguments
      • 15.4.4.3. Arguments containing -
      • 15.4.4.4. Argument abbreviations (prefix matching)
      • 15.4.4.5. Beyond sys.argv
      • 15.4.4.6. The Namespace object
    • 15.4.5. Other utilities
      • 15.4.5.1. Sub-commands
      • 15.4.5.2. FileType objects
      • 15.4.5.3. Argument groups
      • 15.4.5.4. Mutual exclusion
      • 15.4.5.5. Parser defaults
      • 15.4.5.6. Printing help
      • 15.4.5.7. Partial parsing
      • 15.4.5.8. Customizing file parsing
      • 15.4.5.9. Exiting methods
    • 15.4.6. Upgrading optparse code
  • 15.5. optparse — Parser for command line options
    • 15.5.1. Background
      • 15.5.1.1. Terminology
      • 15.5.1.2. What are options for?
      • 15.5.1.3. What are positional arguments for?
    • 15.5.2. Tutorial
      • 15.5.2.1. Understanding option actions
      • 15.5.2.2. The store action
      • 15.5.2.3. Handling boolean (flag) options
      • 15.5.2.4. Other actions
      • 15.5.2.5. Default values
      • 15.5.2.6. Generating help
        • 15.5.2.6.1. Grouping Options
      • 15.5.2.7. Printing a version string
      • 15.5.2.8. How optparse handles errors
      • 15.5.2.9. Putting it all together
    • 15.5.3. Reference Guide
      • 15.5.3.1. Creating the parser
      • 15.5.3.2. Populating the parser
      • 15.5.3.3. Defining options
      • 15.5.3.4. Option attributes
      • 15.5.3.5. Standard option actions
      • 15.5.3.6. Standard option types
      • 15.5.3.7. Parsing arguments
      • 15.5.3.8. Querying and manipulating your option parser
      • 15.5.3.9. Conflicts between options
      • 15.5.3.10. Cleanup
      • 15.5.3.11. Other methods
    • 15.5.4. Option Callbacks
      • 15.5.4.1. Defining a callback option
      • 15.5.4.2. How callbacks are called
      • 15.5.4.3. Raising errors in a callback
      • 15.5.4.4. Callback example 1: trivial callback
      • 15.5.4.5. Callback example 2: check option order
      • 15.5.4.6. Callback example 3: check option order (generalized)
      • 15.5.4.7. Callback example 4: check arbitrary condition
      • 15.5.4.8. Callback example 5: fixed arguments
      • 15.5.4.9. Callback example 6: variable arguments
    • 15.5.5. Extending optparse
      • 15.5.5.1. Adding new types
      • 15.5.5.2. Adding new actions
  • 15.6. getopt — C-style parser for command line options
  • 15.7. logging — Logging facility for Python
    • 15.7.1. Logger Objects
    • 15.7.2. Logging Levels
    • 15.7.3. Handler Objects
    • 15.7.4. Formatter Objects
    • 15.7.5. Filter Objects
    • 15.7.6. LogRecord Objects
    • 15.7.7. LogRecord attributes
    • 15.7.8. LoggerAdapter Objects
    • 15.7.9. Thread Safety
    • 15.7.10. Module-Level Functions
    • 15.7.11. Integration with the warnings module
  • 15.8. logging.config — Logging configuration
    • 15.8.1. Configuration functions
    • 15.8.2. Configuration dictionary schema
      • 15.8.2.1. Dictionary Schema Details
      • 15.8.2.2. Incremental Configuration
      • 15.8.2.3. Object connections
      • 15.8.2.4. User-defined objects
      • 15.8.2.5. Access to external objects
      • 15.8.2.6. Access to internal objects
      • 15.8.2.7. Import resolution and custom importers
    • 15.8.3. Configuration file format
  • 15.9. logging.handlers — Logging handlers
    • 15.9.1. StreamHandler
    • 15.9.2. FileHandler
    • 15.9.3. NullHandler
    • 15.9.4. WatchedFileHandler
    • 15.9.5. RotatingFileHandler
    • 15.9.6. TimedRotatingFileHandler
    • 15.9.7. SocketHandler
    • 15.9.8. DatagramHandler
    • 15.9.9. SysLogHandler
    • 15.9.10. NTEventLogHandler
    • 15.9.11. SMTPHandler
    • 15.9.12. MemoryHandler
    • 15.9.13. HTTPHandler
  • 15.10. getpass — Portable password input
  • 15.11. curses — Terminal handling for character-cell displays
    • 15.11.1. Functions
    • 15.11.2. Window Objects
    • 15.11.3. Constants
  • 15.12. curses.textpad — Text input widget for curses programs
    • 15.12.1. Textbox objects
  • 15.13. curses.ascii — Utilities for ASCII characters
  • 15.14. curses.panel — A panel stack extension for curses
    • 15.14.1. Functions
    • 15.14.2. Panel Objects
  • 15.15. platform — Access to underlying platform’s identifying data
    • 15.15.1. Cross Platform
    • 15.15.2. Java Platform
    • 15.15.3. Windows Platform
      • 15.15.3.1. Win95/98 specific
    • 15.15.4. Mac OS Platform
    • 15.15.5. Unix Platforms
  • 15.16. errno — Standard errno system symbols
  • 15.17. ctypes — A foreign function library for Python
    • 15.17.1. ctypes tutorial
      • 15.17.1.1. Loading dynamic link libraries
      • 15.17.1.2. Accessing functions from loaded dlls
      • 15.17.1.3. Calling functions
      • 15.17.1.4. Fundamental data types
      • 15.17.1.5. Calling functions, continued
      • 15.17.1.6. Calling functions with your own custom data types
      • 15.17.1.7. Specifying the required argument types (function prototypes)
      • 15.17.1.8. Return types
      • 15.17.1.9. Passing pointers (or: passing parameters by reference)
      • 15.17.1.10. Structures and unions
      • 15.17.1.11. Structure/union alignment and byte order
      • 15.17.1.12. Bit fields in structures and unions
      • 15.17.1.13. Arrays
      • 15.17.1.14. Pointers
      • 15.17.1.15. Type conversions
      • 15.17.1.16. Incomplete Types
      • 15.17.1.17. Callback functions
      • 15.17.1.18. Accessing values exported from dlls
      • 15.17.1.19. Surprises
      • 15.17.1.20. Variable-sized data types
    • 15.17.2. ctypes reference
      • 15.17.2.1. Finding shared libraries
      • 15.17.2.2. Loading shared libraries
      • 15.17.2.3. Foreign functions
      • 15.17.2.4. Function prototypes
      • 15.17.2.5. Utility functions
      • 15.17.2.6. Data types
      • 15.17.2.7. Fundamental data types
      • 15.17.2.8. Structured data types
      • 15.17.2.9. Arrays and pointers
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