class_docstr: Base class for viewers.
class_docstr_tok: ["Base","class","for","viewers","."]
docstr: Returns the command used to display the file.
  Not implemented in the base class.
docstr_tok: ["Returns","the","command","used","to","display","the","file",".","Not","implemented","in","the","base","class","."]
code: def get_command(self, file, **options):
      """
      Returns the command used to display the file.
      Not implemented in the base class.
      """
      raise NotImplementedError
  
imports: import os
  import shutil
  import subprocess
  import sys
  import tempfile
  from shlex import quote
  from PIL import Image
label_desc: Use image node_id 3 for calling the Viewer obj's underlying member method code with example usage: obj.get_command(file) without return types