CONSTRUCT - Adding Functionality to the Overall System

[Ilias Lazaridis]

MonkeeSage wrote:
> Ilias Lazaridis wrote:
>> no, I don't know it.
> 
> OK...so how do you evaluate a language when you don't know its basic
> operations? Hmmm, sounds fishy.

The learning-process is an important part of the evaluation.

>> how do I define something into the top-level namespace? I assume I
>> could place it into the root-package of my project, into the __init__
>> function.
>>
>> But how do I place it within my computers python installation (the big
>> init)?
> 
> When you just say:
> 
> def blah(): pass
> 
> Now 'blah' function is in the top-level namespace, just like global
> variables. Or if it's in a different file, you'd say 'from blah import
> *'. You honestly don't know this?!??

I know how to define it:

--- myBlahWithImport.py ---
from mylib import blah

if (__name__ == '__main__'):
     blah()
--- end file ---

what I dont know is, how to negate the need of the import statement.

--- myBlah.py ---
if (__name__ == '__main__'):
     blah()
--- end file ---

>> I am aware of this technique.
>>
>> But I want to modify existent classes, without touching their code.
> 
> The only way to do this is to explicitly subclass the existent classes
> with your own class and modify what you want there in your subclass
> (see below), or use multiple inheritence as I suggested previously.
> 
>> I've noticed some interesting code on you website:
>>
>> "
>> class file(file):
>>   def reopen(self, name=None, mode='w', bufsize=None):
>> ...
>>
>> fh = file('test.txt', 'rb')
>> print fh # <open file 'test.txt', mode 'rb' at 0xb7c92814>
>> fh.reopen(mode='wb')
>> "
>> http://rightfootin.blogspot.com/2006/09/ruby-reopen.html
>>
>> does this mean that I can add a method to a class in a similar way with
>> ruby? (by using class class-name(class-name): )
> 
> Basically, yes. In ruby you can reopen base classes; in python you can
> get the same effect by subclassing the base classes with the same name
> as the base class, then instantiating all your objects as that class.
> This is the exact same idea as a "super-duper super class" as I
> mentioned above.

That's a part of the construct I was looking for.

>> but the limitation is that I cannot do this with the python build-in
>> types?:
>>
>> http://rightfootin.blogspot.com/2006/08/of-rocks-and-reptiles.html
> 
> You can subclass buit-in types using the same name as the parent class.

So, that's a 2nd part of the constrcut I was looking for.

btw: from which class does "int" inherit?

> In fact here is what I use:
> 
> ## my little library to make python more OO
> ## i.e., to get rid of the top-level junk...
> ## or at least to hide it behind some pretty
> ## object attributes :)
> ##
> ## YMMV - and don't complain if you don't
> ## like it; I wrote it for ME, not you
> ##
> ## Jordan Callicoat < MonkeeSage at gmail.com >
> 
> ## some global methods so we can use them
> ## to set up the class methods
... (many code I'll review at a later point)

> It's not the most "pythojnic" way to do things, but it works for me.
> 
> Ps. I still have a hard time belieiving that after all the time you've
> spent on comp.lang.lisp, comp.lang.ruby and comp.lang.python you still
> don't understand these basic concepts...if that's really true, I would
> never use your consulting service!


"CONSTRUCT - Adding Functionality to the Overall System"

This is not a basic concept.

Although in smaltalk and ruby is very simple.

But I've selected to use Python.

.

-- 
http://lazaridis.com