importcache.py

import importlib


IMPORT_CACHE = {}                                        
def cache_import(path):
    """Import an object from a specified `path`."""                        
    mod, imp = path.rsplit('.', 1)                       
    if mod in IMPORT_CACHE:                              
        return getattr(IMPORT_CACHE[mod], imp)           
    mod_ = importlib.import_module(mod)
    IMPORT_CACHE[mod] = mod_                             
    return cache_import(path)