[Python-Dev] SystemError: unknown opcode

Guido van Rossum guido@python.org
Mon, 16 Sep 2002 17:43:29 -0400

> After building Python from CVS (it's been a while) I get this error:

This is key.

>   Python 2.3a0 (#43, Sep 16 2002, 22:47:33) 
>   [GCC 2.95.2 19991024 (release)] on darwin
>   Type "help", "copyright", "credits" or "license" for more information.
>   >>> import fontTools
>   XXX lineno: 1, opcode: 127
>   Traceback (most recent call last):
>     File "<stdin>", line 1, in ?
>     File "/Users/just/code/fonttools/Lib/fontTools/__init__.py", line 1, in ?
>       version = "2.0b2"
>   SystemError: unknown opcode
>   >>> 
> Does this mean the .pyc magic number needs to be changed? Or is it
> simply the risk of using CVS Python? ;-)

The magic number was changed several times due to the SET_LINENO
changes.  At the end I changed it *back* to what we changed it to
after another change earlier during the 2.3 cycle.  You may be the
only unlucky guy who missed both rounds of SET_LINENO changes.

Remove all your .pyc/.pyo files and be done with it.

--Guido van Rossum (home page: http://www.python.org/~guido/)