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See: https://docs.python.org/2/library/argparse.html#argparse.ArgumentParser.add_subparsers 

I am uploading patches for both 2.7 as well as latest (3.x). I only added the action verbiage itself in, but would it be beneficial to also add in links to more detailed descriptions similar to what is done in ArgumentParser.add_argument earlier in the argparse page?

This ticket's patch appears to have already been merged, yet it is open? 
On 2.7.9 docs [1], it has the exact language. The tutorial page [2] has a nice description as well. Finding this ticket really helped me understand argparse a bit better, and now I vote to close :).
AnneTheAgile, inspired by CodeTriage
1.[] ; ; ; ; ; ; ; ; ; ; X.15.4. argparse — Parser for command-line options, arguments and sub-commands — Python 2.7.9 documentation
https://docs.python.org/2/library
action - The basic type of action to be taken when this argument is encountered at the command line.
2.[] ; ; ; ; ; ; ; ; ; ; X.Argparse Tutorial — Python 2.7.9 documentation
https://docs.python.org/2/howto/argparse.html
we now specify a new keyword, action, and give it the value "store_true". This means that, if the option is specified, assign the value True to args.verbose. Not specifying it implies False.
3.[] ; ;List of all types of 'action', including customizable ; ; ; ; ; ; ; ; X.15.4. argparse — Parser for command-line options, arguments and sub-commands — Python 2.7.9 documentation
https://docs.python.org/2/library/argparse.html#action
action="store_true"
action='store_false'
action="count"
action='store_const'
action='append'
action='version'
action=CustomFooAction

New changeset 350b8e109c42 by Berker Peksag in branch '3.4':
Issue #22317: Document the action parameter in ArgumentParser.add_subparsers() docs.
https://hg.python.org/cpython/rev/350b8e109c42
New changeset 4709290253e3 by Berker Peksag in branch 'default':
Issue #22317: Document the action parameter in ArgumentParser.add_subparsers() docs.
https://hg.python.org/cpython/rev/4709290253e3 

New changeset 430236ef507b by Berker Peksag in branch '2.7':
Issue #22317: Document the action parameter in ArgumentParser.add_subparsers() docs.
https://hg.python.org/cpython/rev/430236ef507b 

Thanks for the patch, Mike.
Anne, thank you for the ticket triage! The only missing place was the ArgumentParser.add_subparsers() documentation: https://docs.python.org/3/library/argparse.html#argparse.ArgumentParser.add_subparsers