On Thu, Oct 7, 2010 at 12:13 PM, kj <no.em...@please.post> wrote: <snip> > It would facilitate the implementation of t() to have a simple test > for mutability. Is there one?
Non-default hashability is an approximate heuristic:
def is_immutable(x):
try:
hash(x)
except TypeError:
return False
else:
klass = type(x)
return klass is object or klass.__hash__ is not object.__hash__
Cheers,
Chris
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