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Py-knack
Jul 20, 2023
Command line interface framework
Knack is a Python command line parsing framework. Knack is built around the following patterns
- Be consistent with POSIX tools.
- CLI success comes from ease and predictability of use so be consistent.
- Support Piping and output direction to chain commands together.
- Work with GREP, AWK, JQ and other common tools and commands.
- Support productivity features like tab completion and parameter value completion.
- Commands should follow a “[noun] [noun] [verb]” pattern.
- For nouns that only support a single verb, the command should be named as a single hyphenated verb-noun pair.
- Commands should support all output types be consistent.
- Exceptions are okay if only a ‘raw’ format makes sense e.g. XML.
- Commands and arguments should have descriptions.
- Include examples for the less straightforward commands.
- Commands should return an object or dictionary, not strings/bools/etc.; logging.info”Upload of myfile.txt successful” NOT return “Upload successful”.
- Log to ERROR or WARNING for user messages; don’t use print function by default it goes to STDOUT.
- STDOUT vs. STDERR STDOUT is used for actual command output. Everything else to STDERR e.g. log/status/error messages.
- Older
- Newer
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