Obscure FirstError '{' in release bootstraps
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gracinet commented
Failure: twisted.internet.defer.FirstError: FirstError[#12, [Failure instance: Traceback (failure with no frames): <class 'twisted.internet.defer.FirstError'>: FirstError[#3, [Failure instance: Traceback: <type 'exceptions.ValueError'>: unsupported format character '{' (0x7b) at index 1
According to the doc, this is indeed typical of wrong format strings in Python (on which properties interpolation relies)