[Baypiggies] Newbie-ish type questions...
chad.netzer at gmail.com
Wed Apr 23 18:49:23 CEST 2008
On Wed, Apr 23, 2008 at 9:29 AM, Paul McNett <p at ulmcnett.com> wrote:
> Kelly Yancey wrote:
> > But, yes, it gets better in 3.0:
> > http://www.python.org/dev/peps/pep-3119/
> Now *that* is reason alone to migrate to 3.0.
> def myfunc(seq=None):
> if seq is None:
> seq = ()
> assert isinstance(seq, Sequence)
And in the meantime, it illustates that (generally) you should test
for behaviors, not type. The 'operator' module has some useful
So the assertion above becomes:
If you need a sequence to be a list, just convert it:
seq = list(seq)
With these tools, you should almost never use "type(a) is list", or
similar, in your code.
* Note - I have no idea how isSequenceType() deals with iterators or
generators... Does someone have a few moments to test this?
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