# just test for a single pyd file that I removed from a non-zipped folder
class CustomImporter(object):

   virtual_name = 'pandas._libs.tslib' # a pyd file

   def find_module(self, fullname, path=None):

      if fullname == self.virtual_name:
         return self

      return None

   def load_module(self, fullname):

      if fullname in sys.modules:
            return sys.modules[fullname]

      if fullname != self.virtual_name:
         raise ImportError(fullname)
      try:
          path = r"C:.....tslib.cp35-win_amd64.pyd"
          module = imp.load_dynamic("tslib",path )
          module.__file__ = path
          module.__loader__ = self
          module.__name__ = self.virtual_name
          sys.modules[self.virtual_name] = module
      except BaseException as e:
          raise ImportError(fullname + str(e))

      return module

sys.meta_path.append(CustomImporter())