old_contents: #!/usr/bin/env python3
  
  from enum import Enum
  
  class LineChange:
  
      class ChangeType(Enum):
              added = 1
              deleted = 2
              modified = 3
  
      def __init__(self):
          self.number = None
          self.change_type = None
          self.author = None
          self.filename = None
          self.commit = None
  
      def __init__(self, number, change_type, filename, commit):
          self.number = number
          self.change_type = change_type
          self.filename = filename
          self.commit = commit
  
new_contents: #!/usr/bin/env python3
  
  from enum import Enum
  
  class LineChange:
  
      class ChangeType(Enum):
              added = 1
              deleted = 2
              modified = 3
  
      def __init__(self, number=None, change_type=None, filename=None, commit=None):
          self.number = number
          self.change_type = change_type
          self.filename = filename
          self.commit = commit
          self.author = None
  
subject: Remove duplicate LineChange constructor.