Python-сообщество

data = """
rules:      evdev
model:      pc105
layout:     us,ru
variant:    ,
options:    grp:alt_shift_toggle,grp_led:scroll
"""

dict((a, b.strip()) for a, b in
                 (item.split(":") for item in
                  data.splitlines()))

data.splitlines()
['', 'rules:      evdev', 'model:      pc105', 'layout:     us,ru', 'variant:    ,', 'options:    grp:alt_shift_toggle,grp_led:scroll']

>>> data = """
... rules:      evdev
... model:      pc105
... layout:     us,ru
... variant:    ,
... options:    grp:alt_shift_toggle,grp_led:scroll
... """
>>> 
>>> d = {k.strip():v.strip() for k, v in
...      (i.split(':', 1) for i in data.splitlines() if i.strip())}
>>> 
>>> print(d)
{'options': 'grp:alt_shift_toggle,grp_led:scroll', 'rules': 'evdev', 'model': 'pc105', 'variant': ',', 'layout': 'us,ru'}
>>>