encapsulation, typing & other questions
Jeff Shannon
jeff at ccvcorp.com
Thu Feb 7 15:32:28 EST 2002
Ragu Bharadwaj wrote:
> Hi Guys,
Hi! I'll only answer the questions that I feel qualified to say anything on...
> 2. How easy is it to use design patterns in Python? A lack of typing
> suggests it wouldn't be too easy, but I'd like to hear back from folks
> that have tried this.
It's very easy. Many design patterns seem to almost be built-in to Python, many
others can be expressed in only a few lines of code. The patterns that *don't*
seem to apply to Python, in fact, seem to be the ones whose whole point is
evading the type system. (Laura Creighton recently made a comment to this
effect, about the GoF "Design Patterns" book....)
> 3. Are there plans to include method & variable encapsulation in the
> object models in python? The answer I've heard is that since it's
> possible to overcome encapsulation by long or dirty ways, it isn't worth
> it. But my comeback is that if one sticks to the rules while coding,
> this won't happen and the resulting gains are worth it.
Python *does* have encapsulation. What it doesn't have is strictly enforced data
hiding. However, if one sticks to the rules while coding, then having that
enforcement is not necessary. And when in a situation that doesn't quite fit in
what the rules were intended to cover, then having that added flexibility can be
very much worth it.
(Note that Python *does* have some level of data hiding, but it's deliberately
easy to circumvent. Instead of enforcing secrecy, it simply asks "Please don't
look at this"... )
Jeff Shannon
Technician/Programmer
Credit International
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