Appease flake8

1 job for feature_buster in 22 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Build
failed build #3885

00:00:22

 
Name Stage Failure
failed
build Build
asn1scc/pl/FSharp.Core.resources.dll
asn1scc/System.Net.WebSockets.dll
asn1scc/System.Diagnostics.DiagnosticSource.dll
/builds/taste/dmt
Performing syntax checks via flake8...
dmt/A_mappers/qgenada_A_mapper.py:29:1: F401 'sys' imported but unused
make: *** [Makefile:24: flake8] Error 1
Cleaning up file based variables
ERROR: Job failed: exit code 1