def FromSpec(self, spec):
        """
        Args:
          spec: (name, {...}), or Parameter object

        Dict keys:
          "caption" -- (optional) text for label in editor. Defaults to the
                 keyword argument name
          "toolTip" (optional)
          "type" -- (optional, defaults to type("value") or int if "value" is
              not specified. Accepts:
                - int
                - float
                - str
                - bool
                - list
          "value" -- (optional) defaults to 1 if numeric, False if bool,
               "" if str

        """
        if isinstance(spec, Parameter):
            self.name = spec.name
            self.caption = spec.caption if spec.caption is not None else spec.name
            self.toolTip = spec.toolTip if spec.toolTip is not None else ""
            self.type = spec.type if spec.type is not None else type(spec.value) if spec.value is not None else int
            self.value = spec.value
        else:
            self.name, d = spec
            self.caption = d.get("caption", self.name)
            self.toolTip = d.get("toolTip", "")
            t = self.type = d.get("type", type(d["value"]) if "value" in d else int)
            if not t in (int, float, bool, str, list):
                raise TypeError("Invalid type: '{0!s}'".format(t.__name__))
            self.value = d.get("value")

        if self.value is None:
            self.value = 0 if self.type == int else \
                0. if self.type == float else \
                False if self.type == bool else ""
Args:
          spec: (name, {...}), or Parameter object

        Dict keys:
          "caption" -- (optional) text for label in editor. Defaults to the
                 keyword argument name
          "toolTip" (optional)
          "type" -- (optional, defaults to type("value") or int if "value" is
              not specified. Accepts:
                - int
                - float
                - str
                - bool
                - list
          "value" -- (optional) defaults to 1 if numeric, False if bool,
               "" if str