On Sun, Oct 23, 2016 at 11:51 AM, eryk sun <eryk...@gmail.com> wrote: > It matches the behavior of generator expressions, for which Guido > gives the following example, as quoted in PEP 289: > > Consider sum(x for x in foo()). Now suppose there's a bug in foo() > that raises an exception, and a bug in sum() that raises an > exception before it starts iterating over its argument. Which > exception would you expect to see? I'd be surprised if the one in > sum() was raised rather the one in foo(), since the call to foo() > is part of the argument to sum(), and I expect arguments to be > processed before the function is called.
Fair enough, except that a generator expression is syntactic sugar for a generator function, and the return value of a generator function is a generator object that hasn't yet been started. So where the boundary is, then, is a bit of a fuzzy line. Thanks for digging that up, at least. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
