code: def markdown(value, arg=''):
      
      import warnings
      warnings.warn('The markdown filter has been deprecated',
                    category=DeprecationWarning)
      try:
          import markdown
      except ImportError:
          if settings.DEBUG:
              raise template.TemplateSyntaxError(
                  "Error in 'markdown' filter: The Python markdown library isn't installed."
              )
          return force_text(value)
      else:
          markdown_vers = getattr(markdown, "version_info", 0)
          if markdown_vers < (2, 1):
              if settings.DEBUG:
                  raise template.TemplateSyntaxError(
                      """
                      Error in 'markdown' filter:
                      Django does not support versions of the Python markdown library < 2.1.
                      """
                  )
              return force_text(value)
          else:
              extensions = [e for e in arg.split(",") if e]
              if extensions and extensions[0] == "safe":
                  extensions = extensions[1:]
                  return mark_safe(markdown.markdown(
                      force_text(value), extensions, safe_mode=True, enable_attributes=False))
              else:
                  return mark_safe(markdown.markdown(
                      force_text(value), extensions, safe_mode=False))
docs: Runs Markdown over a given value, optionally using various
      extensions python-markdown supports.
  
      Derived from django.contrib.markdown, which was deprecated from django.
  
      ALWAYS CLEAN INPUT BEFORE TRUSTING IT.
  
      Syntax::
  
          {{ value|markdown:"extension1_name,extension2_name..." }}
  
      To enable safe mode, which strips raw HTML and only returns HTML
      generated by actual Markdown syntax, pass "safe" as the first
      extension in the list.
  
      If the version of Markdown in use does not support extensions,
      they will be silently ignored.