Query the value of a variable attribute. The full list of available attributes can be found in the Attributes section.
Raises an AttributeError if the requested attribute doesn't
exist or can't be queried.
Arguments:
attrname: The attribute being queried.
Return value:
The current value of the requested attribute.
Example usage:
print(var.getAttr(GRB.Attr.x))
print(var.getAttr("x"))