text: #!/usr/bin/env python3
  import os
  
  
  def convert_header_to_python3():
      directory = os.path.dirname(__file__)
  
      for filename in os.listdir(directory):
          if filename.endswith(".py") and filename.startswith("0"):
              lines = []
              with open(os.path.join(directory, filename), 'r+') as file:
                  lines = file.readlines()[1:]
                  file.truncate()
  
              with open(os.path.join(directory, filename), 'r+') as file:
                  file.writelines(['#!/usr/bin/env python3', '\n'] + lines)
  
          else:
              continue
  
  
  if __name__ == '__main__':
      convert_header_to_python3()
  