On 11/13/2015 6:04 PM, fl wrote: > I read the following code snippet. A question is here about '@'. > I don't find the answer online yet. Start with the index of the fine docs, which includes symbols. https://docs.python.org/3/genindex-Symbols.html '@' is near the end of the page. > @pymc.deterministic > def theta(a=alpha, b=beta): -- Terry Jan Reedy