code: def available():
      try:
          version()
      except MissingDependencyError:
          return False
      return True
  
file_path: OCRmyPDF/src/ocrmypdf/_exec/pngquant.py
imports: from __future__ import annotations
  from pathlib import Path
  from subprocess import PIPE
  from packaging.version import Version
  from ocrmypdf.exceptions import MissingDependencyError
  from ocrmypdf.subprocess import get_version, run
label_desc: Use image node_id 2 for calling a global function with example usage: available() and returns: True, False