def __copy__(self, target=None):
'''Create a deep copy of this instance.
target -- optional target instance for copying, useful for
copying a derived class. Defaults to new instance
of the same type as self.
Return a duplicate instance of this object.
'''
if target is None:
target = Structure()
elif target is self:
return target
# copy attributes as appropriate:
target.title = self.title
target.lattice = Lattice(self.lattice)
target.pdffit = copy.deepcopy(self.pdffit)
# copy all atoms to the target
target[:] = self
return target
def __emptySharedStructure(self):
'''Return empty Structure with standard attributes same as in self.
'''
rv = Structure()
rv.__dict__.update([(k, getattr(self, k)) for k in rv.__dict__])
return rv
