def __new__(cls, cartantype):
"""Create a new RootSystem object
This method assigns an attribute called cartan_type to each instance of
a RootSystem object. When an instance of RootSystem is called, it
needs an argument, which should be an instance of a simple Lie algebra.
We then take the CartanType of this argument and set it as the
cartan_type attribute of the RootSystem instance.
"""
obj = Atom.__new__(cls)
obj.cartan_type = CartanType(cartantype)
return obj
def __new__(cls, cartantype):
obj = Atom.__new__(cls)
obj.cartan_type = CartanType(cartantype)
return obj
def __new__(cls, function):
if not callable(function):
raise TypeError('Callable expected, got: %r' % function)
obj = Atom.__new__(cls)
obj.function = function
return obj
