dev-python/webassets-0.12.1 still depends on Python 3.6. Does it work with Python 3.7? I did not test that. Or should we rather stabilize dev-python/webassets-2.0? Something needs to be done about it wrt bug 721752.
Please add arches if ready, there is no stable version that is py37 compatible. Please also check all other packages *you* maintain that depend on python.
amd64 stable
x86 stable