unknown opcode Exception then AV

[Geoff Bien]

I have one script out of many (python 2.1 activestate on win32)
which gives an "invalid opcode" exception and then also
sometimes causes an AV.

This script  uses intebase with the gvib or kinterbasdb
extension modules. since using gvib or kinterbasedb
makes no difference to the problem they are probably
not the cause

this is the only script I have problems with. it is too long
to post here.

Traceback (most recent call last):
  File "<string>", line 452, in ?
  File "<string>", line 446, in go
  File "<string>", line 425, in doPeriod
  File "<string>", line 341, in doMonth
SystemError: unknown opcode

the interpreter seems quite confused with this script,
in other places simple statements like x=x+1  are giving
the wrong results