Frozenset?

[tschm]

This is a query I use to select all fields that are of type BB static or BB dynamic:

x = [name for name in select(f.name for f in Field if f.type.name in set({'BB-static', 'BB-dynamic'}))]

Good Python suggests to remove the set() construct and go directly with {...}. I am running Python 3.6.
However, then {} is a frozenSet and pony fails.

[Vitalium]

Why not to use list [] or tuple ()?

x = [name for name in select(f.name for f in Field if f.type.name in ['BB-static', 'BB-dynamic'])]

[sashaaero]

Thanks for reporting, tschm. Fix is already on github.
Now it should work.