Terry J. Reedy added the comment:

The TypeError is correct.  You passed a non-iterable.  I agree that adding 
information, *if possible*, when 'non-iterable' is determined by an exception 
being raised, would be nice.  I don't know how easy this would be.

----------
nosy: +terry.reedy
stage:  -> test needed
type: behavior -> enhancement
versions: +Python 3.6

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<http://bugs.python.org/issue26407>
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