Pin attrs <21 for testing on Python 3.4 #417
Merged
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Tests failed on PR #416 for Python 3.4, because it got a version of
attrs
that was too new.In fact the offending release has been yanked (see python-attrs/attrs#807 )... but it seems that the version of pip which supports Python 3.4 is too old to know about yanking, so it needs this workaround.