@command
def simple_greet(name):
  """An example of @command without arguments and printing Usage.

  Arguments:
    name - Name to greet.
  """
  if name != 'John':
    raise CommandrUsageError("John is not a valid name.")
  print 'Hi %s!' % name
dataset/ETHPy150Open tellapart/commandr/example.py/simple_greet/operator `==` -> `!=`