code: def themes():
      """Returns the list of the themes"""
      for i in os.listdir(_THEMES_PATH):
          e = os.path.join(_THEMES_PATH, i)
  
          if os.path.isdir(e):
              if os.path.islink(e):
                  yield (e, os.readlink(e))
              else:
                  yield (e, None)
  
file_path: pelican/pelican/tools/pelican_themes.py
imports: import argparse
  import os
  import shutil
  import sys
label_desc: Use image node_id 3 for calling a global function with example usage: themes() without return types