/usr/lib/python2.7/dist-packages/Pyrex/Debugging.py is in python-pyrex 0.9.8.5-2.1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Odds and ends for debugging
#
###############################################
def print_call_chain(*args):
import sys
print " ".join(map(str, args))
f = sys._getframe(1)
while f:
name = f.f_code.co_name
s = f.f_locals.get('self', None)
if s:
c = getattr(s, "__class__", None)
if c:
name = "%s.%s" % (c.__name__, name)
print "Called from:", name, f.f_lineno
f = f.f_back
print "-" * 70
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