In article <[email protected]>,
 Terry Reedy <[email protected]> wrote:

> Better:    if isinstance(x, (int, float, complex)):

I never noticed this before, but it seems odd that the second argument to 
isinstance() should be a tuple.  Using the normal arguments made about 
tuples vs. lists, it seems like a list would be the right data structure 
here.  I suppose a set would be even more right, but (I'm pretty sure) 
isinstance() predates sets.

I'm curious why a tuple was chosen.
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