236             # The default is the C version of ElementTree, but if that

   236             # The default is the C version of ElementTree, but if that

   237             # is not available, the pure Python version is used

   237             # is not available, the pure Python version is used

   238             for backend_id in self.DEFAULT_BACKEND_IMPORT_ORDER:

   238             for backend_id in self.DEFAULT_BACKEND_IMPORT_ORDER:

   239                 try:

   239                 try:

   240                     self.set_backend_id(backend_id)

   240                     self.set_backend_id(backend_id)

   241                 except ImportError:

   242                 except ImportError:

   242                     pass

   243                     pass

   243             

   244             

   244             if self._backend_wrapper is None:

   245             if self._backend_wrapper is None:

   245                 raise RuntimeError("Failed to set any ElementTree backend! Tried these: %r" % self.DEFAULT_BACKEND_IMPORT_ORDER)

   246                 raise RuntimeError("Failed to set any ElementTree backend! Tried these: %r" % self.DEFAULT_BACKEND_IMPORT_ORDER)