allow adding default link attributes to the input and output nodes of a graph

6 jobs for !75 with 18-output-node-conditions in 38 seconds (queued for 8 seconds)
detached
Status Name Job ID Coverage
  Style
passed black #287085

00:00:09

passed flake8 #287084

00:00:08

 
  Test
passed test-3.6 #287086

00:00:24

79.0%
passed test-3.7 #287087

00:00:27

79.0%
passed test-3.8 #287088

00:00:26

79.0%
passed test-3.9 #287089

00:00:27

79.0%