Mark Smith - Writing Awesome Command-Line Programs in Python смотреть онлайн

Mark Smith - Writing Awesome Command-Line Programs in Python
[EuroPython 2014]
[24 July 2014]

Command-Line programs can have a lot to them - usually more than you think, yet often suffer from a lack of thought.
This is a tour through how to structure your code, tools in the standard library and some 3rd party libraries. Take your command-line programs to the next level!

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Python is a great language for writing command-line tools - which is why so much of Linux is secretly written in Python these days. Unfortunately, what starts as a simple script can quickly get out of hand as more features are added and more people start using it!

The talk will consist of a tour through various useful libraries and practical code showing how each can be used, and include advice on how to best structure simple and complex command-line tools.

Things to consider when writing command-line apps:

* Single-file vs Multiple-file
* Standard library only vs. 3rd party requirements
* Installation - setup.py vs. native packaging

The different parts of a command-line program:

* Option Parsing:
* Libraries: getopt, optparse, argparse, docopt
* Sub-commands
* Configuration:
* Formats: Ini file, JSON, YAML
* Where should it be stored (cross-platform);
* Having multiple configuration files, and allowing user config to override global config
* Output:
* Colour - colorama
* Formatting output for the user
* Formatting output for other programs
* How do you know when your output is being piped to another program?
* Managing logging and verbosity
* Managing streamed input
* Exit values: What are the conventions?
* Interactive apps - REPL
* Structuring a bunch of programs/commands around a shared codebase.
* Command-line frameworks: clint, compago & cliff
* Testing command-line apps
* Writing command-line tools in Python 3 vs Python 2