Inheritance crossover packages

[Johannes Bauer]

Hello group,

I'm having a seemingly simple problem. I want to generate a hierarchy of
modules, like this one:

GenerationScripts/
GenerationScripts/dhcp
GenerationScripts/bind9

And the files:

GenerationScripts/dhcp/__init__.py
GenerationScripts/bind9/generator.py
GenerationScripts/bind9/__init__.py
GenerationScripts/mastergen.py
GenerationScripts/__init__.py

All packages (bind9, dhcp) should inherit from the master generator
"mastergen".

I'm at the very beginning:

$ cat GenerationScripts/__init__.py
import bind9
#import dhcpd

$ cat GenerationScripts/bind9/__init__.py
import GenerationScripts.bind9.generator

$ cat GenerationScripts/bind9/generator.py
from GenerationScripts import mastergen

class generator(mastergen):
def __init__(self):
print "init bind9 generator"

Now what happens when I import GenerationScripts and try to create a
instance of GenerationScripts.bind9.generator is the following:

Traceback (most recent call last):
File "./Generate.py", line 3, in <module>
import GenerationScripts
File "/home/joe/x/GenerationScripts/__init__.py", line 3, in <module>
import bind9
File "/home/joe/x/GenerationScripts/bind9/__init__.py", line 4, in
<module>
import GenerationScripts.bind9.generator
File "/home/joe/x/GenerationScripts/bind9/generator.py", line 7, in
<module>
class generator(mastergen):
TypeError: Error when calling the metaclass bases
module.__init__() takes at most 2 arguments (3 given)

I really don't get it - and I've searched and found the same problem,
read the descirption - but still don't get it. What's happening here?

Regards,
Johannes

--
"Wer etwas kritisiert muss es noch lange nicht selber besser können. Es
reicht zu wissen, daß andere es besser können und andere es auch
besser machen um einen Vergleich zu bringen." - Wolfgang Gerber
in de.sci.electronics <47***********************@news.freenet.de>

[Carl Banks]

On Aug 11, 2:41*pm, Johannes Bauer <[e-mail]:

Hello group,

I'm having a seemingly simple problem. I want to generate a hierarchy of
modules, like this one:

GenerationScripts/
GenerationScripts/dhcp
GenerationScripts/bind9

And the files:

GenerationScripts/dhcp/__init__.py
GenerationScripts/bind9/generator.py
GenerationScripts/bind9/__init__.py
GenerationScripts/mastergen.py
GenerationScripts/__init__.py

All packages (bind9, dhcp) should inherit from the master generator
"mastergen".

I'm at the very beginning:

$ cat GenerationScripts/__init__.py
import bind9
#import dhcpd

$ cat GenerationScripts/bind9/__init__.py
import GenerationScripts.bind9.generator

$ cat GenerationScripts/bind9/generator.py
from GenerationScripts import mastergen

class generator(mastergen):
* * * * def __init__(self):
* * * * * * * * print "init bind9 generator"

mastergen is a module, so you can't subclass it. Try changing the
import line to:

from GenerationScripts.mastergen import mastergen
BTW, the error message is misleading, and it seems like it'd be a
common error. Maybe it deserves a special case error message. (I.e.
if the call to metaclass.__init__ raises TypeError, check to see if
it's a module and raise a better error message.)
Carl Banks