python argparse: unrecognized arguments

The error you are getting is because -u is expecting a some value after it. If you use python script.py -h you will find it in usage statement saying [-u UPGRADE].

If you want to use it as boolean or flag (true if -u is used), add an additional parameter action:

parser.add_argument("-u","--upgrade", help="fully automatized upgrade", action="store_true")

action - The basic type of action to be taken when this argument is encountered at the command line

With action="store_true", if the option -u is specified, the value True is assigned to args.upgrade. Not specifying it implies False.

Source: Python argparse documentation

Currently, your argument requires a value to be passed in for it as well.

If you want -u as an option instead, Use the action='store_true' for arguments that do not need a value.

Example -

parser.add_argument("-u","--upgrade", help="fully automatized upgrade", action='store_true')

For Boolean arguments use action="store_true":

parser.add_argument("-u","--upgrade", help="fully automatized upgrade", action="store_true")

See: https://docs.python.org/2/howto/argparse.html#introducing-optional-arguments