McAsciiEventSelector: cmake cleanup and enable flake8

Generators/McAsciiEventSelector/CMakeLists.txt

-################################################################################
-# Package: McAsciiEventSelector
-################################################################################
+# Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 
 # Declare the package name:
 atlas_subdir( McAsciiEventSelector )
 
-# Declare the package's dependencies:
-atlas_depends_on_subdirs( PUBLIC
-                          GaudiKernel
-                          PRIVATE
-                          Control/AthenaBaseComps
-                          Control/AthenaKernel
-                          Event/EventInfo
-                          PhysicsAnalysis/TruthParticleID/McParticleKernel )
-
 # Component(s) in the package:
 atlas_add_component( McAsciiEventSelector
                      src/*.cxx
@@ -21,6 +10,6 @@ atlas_add_component( McAsciiEventSelector
                      LINK_LIBRARIES GaudiKernel AthenaBaseComps AthenaKernel EventInfo McParticleKernel )
 
 # Install files from the package:
-atlas_install_python_modules( python/*.py )
+atlas_install_python_modules( python/*.py POST_BUILD_CMD ${ATLAS_FLAKE8} )
 atlas_install_joboptions( share/*.py )
 

Generators/McAsciiEventSelector/python/ReadMcAscii.py

-# Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+# Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
 
 ## @file McAsciiEventSelector/python/ReadMcAscii.py
 ## @brief: install the McAsciiEventSelector
 
 def _loadReadMcAscii():
-    import AthenaCommon.AtlasUnixStandardJob
+    import AthenaCommon.AtlasUnixStandardJob  # noqa: F401
     from AthenaCommon.AppMgr import theApp
     from AthenaCommon.AppMgr import ServiceMgr as svcMgr