I note in PEP 3000 the proposal to remove callable(), with the comment "just
call the object and catch the exception."
I think that's a bad idea, because it takes away the ability to separate the
callability test from the first call. As a simple example, suppose you're
writing a function that you expect to be given a function as one of its
arguments:
def foo(bar, fun):
assert callable(fun)
# ...
It might be that foo doesn't actually call fun until much later.
Nevertheless, from a testing viewpoint, it would be better to detect the
error immediately of passing something that can't be called.
If you didn't have callable, how would you write this example?
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