pylint: W0104: Statement seems to have no effect

Change-Id: Ie4d022b5246563948bbf621dc55ccb4cb086d2e5
pylint: W0105: String statement has no effect

Change-Id: Ib6d906f40308ece04ff970c523acea5105915832
pylint: W0402: Uses of a deprecated module 'string'

Change-Id: Ieb47a72d71a2736a34469e730addcdfb74d8e27c
pylint: W0404: Reimport of module

Change-Id: Idab445314e45d79905998d9de7f0cc43dcc49dbd
pylint: W0211/W0213: Method self argument

Change-Id: I9ea02666baad2565fd71717260eea837c5d9301b
pylint: E0702: Raising NoneType while only classes, instances or string

Change-Id: Ic08a64bc52ec3df299f036612f76d6782c583030