code: def visit(visitor, obj, attr, kernTables):
      for table in kernTables:
          kernTable = table.kernTable
          for k in kernTable.keys():
              kernTable[k] = visitor.scale(kernTable[k])
  
imports: from fontTools.ttLib.ttVisitor import TTVisitor
  import fontTools.ttLib
  import fontTools.ttLib.tables.otBase
  import fontTools.ttLib.tables.otTables
  from fontTools.cffLib import VarStoreData
  import fontTools.cffLib.specializer
  from fontTools.varLib import builder
  from fontTools.misc.fixedTools import otRound
  from fontTools.ttLib.tables._g_l_y_f import VarComponentFlags
label_desc: Use image node_id 6 for calling a global function with example usage: visit(visitor, obj, attr, kernTables) without return types