old_contents: # -*- coding: utf-8 -*-
  """OpenERP community addons standard plugin for flake8"""
  from __future__ import absolute_import
  
  import common_checker
  from common_checker.base_checker import BaseChecker
  
  # When OpenERP version 8 API will be frozen
  # We wille be able to do version toggle here
  import v7
  
  __version__ = '0.0.1'
  
  
  class OpenERPConventionsChecker(object):
      """Check OpenERP conventions
  
      It will call the function 'visit(root_node)' for all checker instances
      registered in BaseCheckerMeta
  
      """
  
      name = 'OpenERP convention'
  
      version = __version__
  
      def __init__(self, tree, filename):
          """Constructor
  
          :param tree: root ast.node of current module
          :param filename: current module filename
          """
          self.tree = tree if tree else ()
          self.filename = filename
          self.checks = BaseChecker._checks
  
  
      def run(self):
          """Run the checks"""
          return self.check_tree(self.tree)
  
      def check_tree(self, tree_root):
          """Apply all checks registered in BaseCheckerMeta on root ast.node
  
          :param tree_root: Root ast node of the namespace
  
          :returns: yeld list of errors codes
  
          """
          for check in self.checks:
              check.visit(tree_root)
              for error in check.errors:
                  yield error
  
new_contents: # -*- coding: utf-8 -*-
  """OpenERP community addons standard plugin for flake8"""
  from __future__ import absolute_import
  
  import common_checker
  from common_checker.base_checker import BaseChecker
  
  # When OpenERP version 8 API will be frozen
  # We wille be able to do version toggle here
  import v7
  
  __version__ = '0.0.1'
  
  
  class OpenERPConventionsChecker(object):
      """Check OpenERP conventions
  
      It will call the function 'visit(root_node)' for all checker instances
      registered in BaseCheckerMeta
  
      """
  
      name = 'OpenERP convention'
  
      version = __version__
  
      def __init__(self, tree, filename):
          """Constructor
  
          :param tree: root ast.node of current module
          :param filename: current module filename
          """
          self.tree = tree if tree else ()
          self.filename = filename
          self.checks = BaseChecker._checks
  
  
      def run(self):
          """Run the checks"""
          return self.check_tree(self.tree)
  
      def check_tree(self, tree_root):
          """Apply all checks registered in BaseCheckerMeta on root ast.node
  
          :param tree_root: Root ast node of the namespace
  
          :returns: yeld list of errors codes
  
          """
          for check in self.checks:
              check.set_filename(self.filename)
              check.visit(tree_root)
              for error in check.errors:
                  yield error
  
subject: Improve BaseChecker class by using __metaclass__ keyword + add a filename setter