python docopt arguments normalize: lowercase, remove '-'

docopt-normalize.py

'''
args: {'--append': True, 'FILE1': 'test', 'normal': 'normal'}
cfg: {'append': True, 'file1': 'test', 'normal': 'normal'}
'''

# simple way
cfg = {}
for arg in args:
    cfg[arg.lower().replace('-','')] = args[arg]

# list comprehension way
cfg = {k.lower().replace('-',''): v for (k, v) in args.iteritems()}