My program boiler uses argparse for parsing command line options and subparser chain (in fact, I am going to add more subcommands). It should take the option -t both for the main option parser and for the subparser.
Example:
boiler -t URL chain
is equivalent to
boiler chain -t URL
The subcommand parser's option overrides the global option. For example:
boiler -t URL1 chain -t URL2
is equivalent to
boiler chain -t URL2
What is the most elegant way to code this with Python argparse?
The thing I am really going to do is describes in this answer: https://stackoverflow.com/a/53750697/856090 of the question Chaining in a command line several tranformations with options. Take note that the above described is not exactly what I need, but I need to parse a pipeline of subcommands as described there (some of these subcommands may take -t option and other options with possible global default).
Example of what I really need:
boiler -t URL1 pipe 'chain -t URL2 + chain'
Here the first chain of two chains separated by + uses URL2 and the second one uses URL1.