Author veky
Recipients crwilcox, eric.smith, jitterman, veky, zach.ware
Date 2020-02-13.04:42:07
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Message-id <1581568927.72.0.815967961089.issue39601@roundup.psfhosted.org>
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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'
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Date User Action Args
2020-02-13 04:42:07vekysetrecipients: + veky, eric.smith, zach.ware, jitterman, crwilcox
2020-02-13 04:42:07vekysetmessageid: <1581568927.72.0.815967961089.issue39601@roundup.psfhosted.org>
2020-02-13 04:42:07vekylinkissue39601 messages
2020-02-13 04:42:07vekycreate