import sys
import traceback


def raise_exception_impl(exi):
	if exi:
		raise exi[0], exi[1], exi[2]
	raise "An exception"

def raise_exception(exi=None):
	raise_exception_impl(exi)

def catch1():
	try:
		raise_exception()
	except:
		print "catched 1"
		traceback.print_exc()
		return sys.exc_info()

def catch2(exi):
	try:
		raise_exception(exi)
	except:
		print "catched 2"
		traceback.print_exc()
		print "\n"
		print_exi(sys.exc_info())

def print_exi(exi):
	print "Printing traceback..."
	tb=exi[2]
	while tb is not None:
		f1=tb.tb_frame
		print "Frame1 ", f1
		traceback.print_stack(f1,None, sys.stdout)
		if tb.tb_next is not None:
			f2=tb.tb_next.tb_frame.f_back
			print "Frame2 ", f2
			if f1 != f2:
				print "!!!!! Error: expected frame"
				traceback.print_stack(f2,1, sys.stdout)
				print "!!!!! Error: end"
		tb=tb.tb_next

def doit():
	global_exi=catch1()
	print "Saved exception 1\n"
	print_exi(global_exi)
	print "\nRethrowing exception"
	catch2(global_exi)

doit()