Load houdini otls / hdas on the fly

houdini_otl_hotload.py

import hou
import os.path


def loadHdaLibrary(libPath):
    """
    Loads all the HDA files in a folder
    
    @param libPath: HDA library file path
    """
    
    if not os.path.isdir(libPath):
        print 'library path "%s" does not exist' % libPath
        return
    
    loaded_files = hou.hda.loadedFiles()
    
    # Get all the .otl files in the directory.
    filetypes = ['.otl', '.hda']
    otl_files = [f for f in os.listdir(libPath) if os.path.splitext(f)[1] in filetypes]
    
    for otl_path in otl_files:
        # backslashes are the devils work
        full_path = os.path.join(libPath, otl_path).replace('\\', '/')
        # If the file isn't already loaded, install it.
        if full_path not in loaded_files:
            print 'installing', full_path
            hou.hda.installFile(full_path)

if not os.path.isdir(libPath): print 'library path "%s" does not exist' % libPath

what about using .format instead?