On Wed, Nov 29, 2017 at 6:03 AM, Soni L. <fakedme+py@gmail.com> wrote:

Would be useful to pass exception-raising lambdas around.

ensure(cond, lambda: raise TypeError())

I guess one could instead use (and raise in ensure())

ensure(cond, lambda: TypeError())

But I think exception-raising lambdas would be nicer.

You can easily create a throw() function: def throw(exc): raise exc Then you can use that in your lambda function: ensure(cond, lambda: throw(TypeError("..."))) However, before you jump onto the "let's construct this lazily" idea, benchmark the cost of creating a lambda function. It's more expensive than a lot of people realize, and if all you save is a bit of string formatting, you may as well just eagerly format that string. ChrisA