The diff doesn't show an addition to BENCH_GROUPS. Maybe apps? On Thu, Oct 24, 2013 at 4:24 PM, antoine.pitrou wrote:

http://hg.python.org/cpython/rev/8939c0196990 changeset: 86603:8939c0196990 user: Antoine Pitrou date: Thu Oct 24 22:23:42 2013 +0200 summary: Close #19379: Lazily import linecache in the warnings module, to make startup with warnings faster until a warning gets printed.

files: Lib/warnings.py | 6 ++---- Misc/NEWS | 3 +++ 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/Lib/warnings.py b/Lib/warnings.py --- a/Lib/warnings.py +++ b/Lib/warnings.py @@ -1,9 +1,5 @@ """Python part of the warnings subsystem."""

-# Note: function level imports should *not* be used -# in this module as it may cause import lock deadlock. -# See bug 683658. -import linecache import sys

__all__ = ["warn", "showwarning", "formatwarning", "filterwarnings", @@ -21,6 +17,7 @@

def formatwarning(message, category, filename, lineno, line=None): """Function to format a warning the standard way.""" + import linecache s = "%s:%s: %s: %s\n" % (filename, lineno, category.__name__, message) line = linecache.getline(filename, lineno) if line is None else line if line: @@ -233,6 +230,7 @@

# Prime the linecache for formatting, in case the # "file" is actually in a zipfile or something. + import linecache linecache.getlines(filename, module_globals)

if action == "error": diff --git a/Misc/NEWS b/Misc/NEWS --- a/Misc/NEWS +++ b/Misc/NEWS @@ -21,6 +21,9 @@ Library -------

+- Issue #19379: Lazily import linecache in the warnings module, to make + startup with warnings faster until a warning gets printed. + - Issue #19327: Fixed the working of regular expressions with too big charset.

- Issue #17400: New 'is_global' attribute for ipaddress to tell if an address

-- Repository URL: http://hg.python.org/cpython

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