import sys, cgitb
def raiseError():
    raise ValueError('original error')

class dung:
    def __init__(self,go_mad='getattr1'):
        self._mad=''
        self._go_mad=go_mad
        self._h = self._f

    def __repr__(self):
        if self._mad=='repr1': raise ValueError('repr1 madness')
        return '<dung instance>'

    def __getattr__(self,a):
        if self._mad=='getattr1': raise ValueError('getattr1 madness')
        return self.__dict__['_'+a]

    def _f(self,*args):
        self._mad=self._go_mad
        i = 3
        j = 4
        raiseError()
        k = 5
        return 7

try:
    kind = sys.argv[1]
except IndexError:
    kind = 'getattr1'
print sys.version
d = dung(kind)
try:
    d.h('aaa')
except:
    print cgitb.html(sys.exc_info(),context=3)