- assert len(args) == 0
- for kw, typ, dfl in self.KWARGS:
- setattr(self, kw, typ(kwargs.pop(kw, dfl)))
- if kwargs:
- print("KWARGS", self.KWARGS)
- print("kwargs", kwargs)
- raise TypeError(
- self.__class__.__name__ + " stray kwargs " + str(kwargs)
- )
+ """
+ Construct the object _either_ from (length, payload),
+ _or_ from the values of individual fields
+ """
+ assert not args or (len(args) == 2 and not kwargs)
+ if args: # guaranteed to be two arguments at this point
+ self.length, self.payload = args
+ try:
+ self.decode(self.length, self.payload)
+ except error as e:
+ raise DecodeError(e, obj=self)
+ else:
+ for kw, typ, dfl in self.KWARGS:
+ setattr(self, kw, typ(kwargs.pop(kw, dfl)))
+ if kwargs:
+ raise ValueError(
+ self.__class__.__name__ + " stray kwargs " + str(kwargs)
+ )