Al 08/05/12 19:36, En/na Alan Gauld ha escrit:
On 08/05/12 11:23, xancorreu wrote:It works with c = Tag("twice", type(lambda x: x), lambda x: 2*x) but I want to specify the type of (lambda x: x) **manually** as I do with str in bUnfortunately we don't always get what we want. You have to use type for functions. You can use a very simple function, but you need to use type()... type(lambda : 0) is about as simple as you can do it with lambda...
A much pain for me. I think there should be a type.function avaliable in python, like str, int, etc. exists. I think as python is O-O language and have (or at least the page says that) higher-order function, I should could type:
isinstance(2, function) like I do isinstance(2, int) Do you understand my reasoning?
However, you still haven't said why you want the type. It's very unusual in Python to need explicit type information. If we knew what you were trying to do with it we might be able to offer a more pythonic way to go about it.
Yes, I know that the pythonic way is to not define types in variables. The variables are free while there is no assign to these. I need type because I want to implement Tag as triple of name, type and value. I want to differentiate between a tag with type str and value "today" and a tag with tag with type data and value "today".
That's all. Thanks for the answer. Xan. _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
