Andrew Rekdal < a écrit :
> I am trying to bring functions to a class by inheritance... for instance in
> layout_ext I have..
>
>
> --- layout_ext.py---------
> class Layout()
> def...some function that rely on css in Layout.py
It shouldn't, definitively. The Layout instance should have a reference
on the CSS instance, ie:
# layout_ext.py
class LayoutExt(object):
def __init__(self, css):
self.css = css
def some_function(self):
do_something_with(self.css)
# layout.py
from layout_ext import LayoutExt
from CSS import CSS
class Layout(LayoutExt):
def __init__(self, css):
LayoutExt.__init__(self, css)
# etc
> def...
>
> ---EOF--
>
> in the main application file I have...
> ----Layout.py---
> from layout_ext import Layout
> from CSS import CSS
> css = CSS()
> class Layout(Layout)
You will have a problem here - this class statement will shadow the
Layout class imported from layout_ext. Remember that in Python, def and
class statements are executed at runtime and that they bind names in
current namespace - here, the 'class Layout' statement rebinds the name
'Layout' in the Layout module's namespace.
> def __init__
> more code.....
>
> ----EOF----
>
>
> Problem is layout_ext and Layout code is dependant on a Class instance
> 'css'. Whenever the CSS instance it parses a file, this means that I would
> have to parse the file twice?? Why is this? Can I do something like pass an
> already created instance to the import?
Wrong solution, obviously. cf above for the most probably correct one.
HTH
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