When running without an argument, let argparse print a nice usage error:
$ ./sim-rest-client.py
usage: sim-rest-client.py [-h] [-H HOST] [-p PORT] [-v] [-n SLOT_NR] {auth,info} ...
sim-rest-client.py: error: the following arguments are required: {auth,info}
Instead of:
$ ./sim-rest-client.py
Traceback (most recent call last):
File "/usr/share/pysim/contrib/./sim-rest-client.py", line 185, in <module>
main(sys.argv)
File "/usr/share/pysim/contrib/./sim-rest-client.py", line 181, in main
args.func(args)
^^^^^^^^^
AttributeError: 'Namespace' object has no attribute 'func'
Change-Id: I92998d9b94dcfb9dcfc3da161fe5d8f45f242b78
6add18ea08