argparse: identify which subparser was used [duplicate]

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I think this must be easy but I do not get it.

Assume I have the following arparse parser:

import argparse

parser = argparse.ArgumentParser( version='pyargparsetest 1.0' )
subparsers = parser.add_subparsers(help='commands')

# all
all_parser = subparsers.add_parser('all', help='process all apps')

# app
app_parser = subparsers.add_parser('app', help='process a single app')
app_parser.add_argument('appname', action='store', help='name of app to process')

How can I identify, which subparser was used?
calling:

print parser.parse_args(["all"])

gives me an empty namespace:

Namespace()

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