Vedran Čačić <ved...@gmail.com> added the comment:
I can't help with the issue itself (though I must say that I philosophically
don't believe in "sailed off ships" -- in the limit, Python must be the best it
can be, though it can take decades to get there), but I can help you with the
error message. It simply tries to take {{x}} as your v (expression to be
formatted). That is, a set containing a set containing x. But since sets
themselves are not hashable (being mutable), they cannot be contained in sets
(that's why frozensets were invented).
>>> {{4}}
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'set'
----------
nosy: +veky
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39601>
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