#!/usr/bin/env python

# encoding: utf-8

import sys

def trace_exceptions(frame, event, arg):

if event != 'exception':

return

co = frame.f_code

func_name = co.co_name

line_no = frame.f_lineno

filename = co.co_filename

exc_type, exc_value, exc_traceback = arg

print 'Tracing exception:\n%s "%s"\non line %s of %s\n' % \

(exc_type.__name__, exc_value, line_no, func_name)

def trace_calls(frame, event, arg):

if event != 'call':

return

co = frame.f_code

func_name = co.co_name

if func_name in TRACE_INTO:

return trace_exceptions

def c():

raise RuntimeError('generating exception in c()')

def b():

c()

print 'Leaving b()'

def a():

b()

print 'Leaving a()'

TRACE_INTO = ['a', 'b', 'c']

sys.settrace(trace_calls)

try:

a()

except Exception, e:

print 'Exception handler:', e