Python argparse: Mutually exclusive required group with a required option -

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i trying have required mutually exclusive group 1 required parameter. below code have put

#!/usr/bin/python  import argparse import sys  # check option provided part of arguments def parseargv():     parser = argparse.argumentparser()     group = parser.add_mutually_exclusive_group()     group.add_argument("-v", "--verbose", choices=[1,2,3,4],             = "increase verbosity")     group.add_argument("-q", "--quiet", action="store_true", = "run quietly")     name = parser.add_mutually_exclusive_group(required=true)     name.add_argument("-n", "--name", = "name of virtual machine")     name.add_argument("-t", "--template", = "name of template use \             creating vm. if path not provided looked \             under template directory.")     parser.add_argument("-s", "--save", = "save machine template. if \             path not provided saved under template directory.");     #parser.add_argument("-k", "--kick_start", required = true, = "name of \     #        kick start file. if path not provided http \     #        directory.")     if len(sys.argv) == 1:         parser.print_help()     args = parser.parse_args()  if __name__ == '__main__':     parseargv()

now output of program follow

$ python test.py  usage: test.py [-h] [-v {1,2,3,4} | -q] (-n name | -t template) [-s save]  optional arguments:   -h, --help            show message , exit   -v {1,2,3,4}, --verbose {1,2,3,4}                         increase verbosity   -q, --quiet           run quietly   -n name, --name name  name of virtual machine   -t template, --template template                         name of template use creating vm. if path                         not provided looked under template                         directory.   -s save, --save save  save machine template. if path not provided                         saved under template directory. usage: test.py [-h] [-v {1,2,3,4} | -q] (-n name | -t template) [-s save] test.py: error: 1 of arguments -n/--name -t/--template required

but if un-comment line 20 - 22 output change below

$ python test.py  usage: test.py [-h] [-v {1,2,3,4} | -q] (-n name | -t template) [-s save] -k                kick_start  optional arguments:   -h, --help            show message , exit   -v {1,2,3,4}, --verbose {1,2,3,4}                         increase verbosity   -q, --quiet           run quietly   -n name, --name name  name of virtual machine   -t template, --template template                         name of template use creating vm. if path                         not provided looked under template                         directory.   -s save, --save save  save machine template. if path not provided                         saved under template directory.   -k kick_start, --kick_start kick_start                         name of kick start file. if path not provided                         http directory. usage: test.py [-h] [-v {1,2,3,4} | -q] (-n name | -t template) [-s save] -k                kick_start test.py: error: argument -k/--kick_start required

but want either -n / -t along -k become mandatory. how achieve same.

you have achieved it! argparse prints first error finds, while may it's checking -k, recuires -n/-t too. can see giving -k argument.

if provide -k argument, error message change test.py: error: argument -k/--kick_start required test.py: error: 1 of arguments -n/--name -t/--template required.


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