code: def edit(filename, connection=None):
      
      c = connection or connect()
      rev = c.ls(filename)
      if rev:
          rev[0].edit()
docs: Checks out a file into the default changelist
  
      :param filename: File to check out
      :type filename: str
      :param connection: Connection object to use
      :type connection: :py:class:`Connection`