Dynamically add class method causes "SystemError: ... bad argument to internal function"

[Newgene]

Hi, group,
I am trying to dynamically add a method to class by following
this post:

http://groups-beta.google.com/group/comp.lang.python/browse_thread/thread/2ec2ad7a0a5d54a1/928e91be352c6bfc?q=%22new.code(%22+%22import+new&_done=%2Fgroup%2Fcomp.lang.python%2Fsearch%3Fgroup%3Dcomp.lang.python%26q%3D%22new.code(%22+%22import+new%26qt_g%3D1%26&_doneTitle=Back+to+Search&&d#928e91be352c6bfc

But I got the Error like the below:

*******Error**********************
Traceback (most recent call last):
File "C:\Documents and Settings\cwu\Desktop\t1.py", line 36, in ?
C().f2(1,2,4,x='x')
File "C:\Documents and Settings\cwu\Desktop\t1.py", line 19, in newf2
self.f()
SystemError: C:\sf\python\dist\src-maint23\Objects\cellobject.c:22: bad
argument to internal function
*******Error**********************

Anybody has a thought about this problem?

My sample code is pasted as the below:

*********Code*******************************
##import new
##import sys
##
##def safe_tuple(seq):
##   """Force func_code attributes to tuples of strings.
##
##
##   Many of the func_code attributes must take tuples, not lists,
##   and *cannot* accept unicode items--they must be coerced to strings
##   or the interpreter will crash.
##   """
##   seq = map(str, seq)
##   return tuple(seq)
##
##class C:
##    def __init__(self):
##        def _generic(*a,**k):
##            print vars()
##            self.f()
##
##        def _newmethod(newname):
##            fcode = _generic.func_code
##            #code( argcount, nlocals, stacksize, flags, codestring,
constants, names, varnames, filename, name, firstlineno, lnotab)
##            fcode_new = new.code(fcode.co_argcount, fcode.co_nlocals,
fcode.co_stacksize,
##                                 fcode.co_flags, fcode.co_code,
tuple(fcode.co_consts),      # Notice co_consts should *not* be
safe_tupled.
##                                 safe_tuple(fcode.co_names),
safe_tuple(fcode.co_varnames),
##                                 fcode.co_filename,
##                                 newname,
##                                 fcode.co_firstlineno,
fcode.co_lnotab)
##            return new.function(fcode_new,globals())
##        setattr(self,'f2',_newmethod('newf2'))
##
##    def f():
##        print 'from f'
##
##C().f2(1,2,4,x='x')
##
##
**********Code************************

*Sorry, I have to put comment chars before the code to preserve the
proper indentation.

Thanks a lot!


CW