From: Jim Weirich <jweirich@...>
Date: 2004-01-13T13:15:21+09:00
Subject: Re: faster integer arithmetics & arbitrary precision floating number

gabriele renzi wrote:

>>Python2.2's numbers are now also objects and thus it also has to check if it
>>has to do the same type of dispatching that Ruby does, yet its speed is much,
>>much closer to Perl's.
> 
> still, you can't reopen base classes in python, IIRC..

You can't reopen them as you can in Ruby, but it is possible to add 
methods to a class after its definition.  It involves assigning an 
unbounded method to a attribute.

Warning ... Python code below :-)

#=====================================================
class X:
   def hi(self):
     print "Hello"

print "-- First Time --------"
x = X()
x.hi()
try:
   x.bye()
except AttributeError:
   print "Got attribute error while calling bye"

def adios(self):
   print "Bye"

X.bye = adios

print "-- Second Time ------"
x.hi()
x.bye()
#======================================================

Output is ....

=======================================================
-- First Time --------
Hello
Got attribute error while calling bye
-- Second Time ------
Hello
Bye
=======================================================

-- 
-- Jim Weirich       jweirich@one.net      http://onestepback.org
-----------------------------------------------------------------
"Beware of bugs in the above code; I have only proved it correct,
not tried it." -- Donald Knuth (in a memo to Peter van Emde Boas)