On Thu, Jul 15, 2010 at 9:50 AM, Srinivas Reddy Thatiparthy < srinivas_thatipar...@akebonosoft.com> wrote:
> I read from Python 2.6.3 docs that,copied from chm.... > > " Note that filter(function, iterable) is equivalent to [item for item in > iterable if function(item)] if function is not None and [item for item in > iterable if item] if function is None." > > Since they said *equivalent* ,i thought both transform to same byte code.I > missed the point that they are equal *logically*. > Never - "filter", "map" etc are implemented as functions so each call involve a function call in Python which is costly. List comprehensions are implemented in the language and hence much more optimized. So if you are aiming to extract maximum juice from your Python code, prefer native language constructs like comprehensions as opposed to "outsiders" like map, filter etc. If required, always prefer the itertools version of these functions such as itertools.imap etc. > > > > Regards, > Srini T. > -- > > > _______________________________________________ > BangPypers mailing list > BangPypers@python.org > http://mail.python.org/mailman/listinfo/bangpypers > > -- --Anand _______________________________________________ BangPypers mailing list BangPypers@python.org http://mail.python.org/mailman/listinfo/bangpypers
