Robert Collins added the comment:
Right, and a usable API.
I believe that this will meet Guido's use case:
tb = TracebackException(*sys.exc_info, lookup_lines=False)
....
some time later
....
if should_show_tb:
lines = list(tb.format())
I'm not 100% sold on the public API being a generator, but rather than forcing
it one way or the other, I'll let reviewers tell me what they think :)
Performance wise, this is better, with the following times:
format_stack -> 5.19ms
new API to extract and not format -> 3.06ms
new API to extract, not lookup lines and not format -> 2.32ms
Formatting is then 2-3ms per 500 line traceback actually formatted, which seems
terribly slow, but its still better than the 8+ms trunk takes (see my earlier
tests). I'll look at tuning the time to render an actual trace later, since I
don't like paying high costs in unittest ;) - but AIUI this should be enough to
help asyncio as is.
Updated test script I used to isolate times with timeit:
import traceback
def recurse(count, lookup_lines=True):
if count> 0:
return recurse(count - 1, lookup_lines=lookup_lines)
if lookup_lines:
return traceback.Stack.extract(traceback.walk_stack(None),
lookup_lines=True)
else:
return traceback.Stack.extract(traceback.walk_stack(None),
lookup_lines=False)
def doit():
len(recurse(500))
def doit_lazy():
len(recurse(500, False))
----------
Added file: http://bugs.python.org/file37862/issue17911-2.patch
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<http://bugs.python.org/issue17911>
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