def from_filename(cls, filename):
"Initialize an instance of RunMode from the configuration file (JSON format)"
defaults = cls._defaults.copy()
d = json_load(filename)
# Put default values if they are not in d.
for (k,v) in defaults.items():
if k not in d:
d[k] = v
return cls(d)
def json_load(cls, filename):
return cls.from_dict(json_load(filename))
