Johannes Bauer a écrit :
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".
Sorry but this makes no sense. inheritance is a class feature - packages
and modules don't 'inherit'.
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):
<OT>pep08 : class identifiers should be in CamelCase</OT>
def __init__(self):
print "init bind9 generator"
here, mastergen is a module object, not a class object. This just can't
work. What are you trying to do exactly ???
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?
What's happening is that you try to use a module instance (really: an
instance of class 'module') as a base class - and, as a result, the
'module' class as a metaclass. But 1/ the 'module' class initializer's
signature is not compatible with a metaclass signature, and 2/ anyway,
the 'module' class constructor doesn't return a class object anyway.
I don't know what you trying to do, but I suggest you (re)read the
FineManual(tm)'s relevant sections, that is, sections about modules and
packages, and sections about Python's 'new-style' object model.
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