Inheritance in nested classes

[Martin Skou]

I'm experimenting with using Python for a small web interface, using
Mark Hammond's nice win32 extensions.

I use a small class hierarchy which uses inheritance and nested classes.

Here are a small extract of the code:

class page:

def __init__(self):
self.head=[]

def __str__(self):
...

class simple_tag:
...

class p(simple_tag):
...

class table:
...

class row:
...

class data:
...
...


Will this type of code perform noticable slower than unnested classes?

I'm using the Active Server Pages integration in the win32 extensions,
does anyone have good/bad experiences using this interface?

Thanks.

/Martin

 

[Diez B. Roggisch]

I'm experimenting with using Python for a small web interface, using
Mark Hammond's nice win32 extensions.

I use a small class hierarchy which uses inheritance and nested classes.

Here are a small extract of the code:

class page:

def __init__(self):
self.head=[]

def __str__(self):
...

class simple_tag:
...

class p(simple_tag):
...

class table:
...

class row:
...

class data:
...
...


Will this type of code perform noticable slower than unnested classes?

I'm not aware that there is much runtime penalty here - a quick test
reveals that:

import time

class Foo:
def __init__(self, baz):
self.baz = baz

def unnested():
o = Foo(10)

def nested():
class Foo:
def __init__(self, baz):
self.baz = baz



then = time.time()
for i in xrange(100000):
unnested()
print time.time() - then

then = time.time()
for i in xrange(100000):
nested()
print time.time() - then


Yields

0.839588165283
0.817638158798

for me.

But I hope you are aware that nested classes aren't quite the same as
they are in java, are you?

Regards,

Diez

 

[George Sakkis]

But I hope you are aware that nested classes aren't quite the same as
they are in java, are you?

Actually they are more like java's static inner classes. If you want to
simulate non-static inner classes in python, you may check the recipe
here:
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/409366.

George

 

[gmilas]

"I'm using the Active Server Pages integration in the win32 extensions,

does anyone have good/bad experiences using this interface?"

What is it you are trying to do?
I'm using python2.4 with win32 and IIS/python ASP and find it ok. There
were at some point some session overlappings but I'm not sure if it was
the asp interface or my ajax code?

Anyway I have someting you may find usefull in doing asp with python at
http://www.emilas.com/pwh/
and this has an ORM that has an html form generator if I guess your
intention of generating html using python. The generator there is not
general but rather oriented towords databases tables and views.