ImportError: No module named 'lib.models.{model_name}'

[matak07]

While trying to run train.py, I got the following error:

Traceback (most recent call last):
File "train.py", line 33, in
main()
File "train.py", line 29, in main
model = load_model(opt, data)
File "/////codes/skip-ganomaly-master/lib/models/init.py", line 20, in load_model
model_lib = importlib.import_module(model_path)
File "/usr/lib/python3.5/importlib/init.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "", line 986, in _gcd_import
File "", line 969, in _find_and_load
File "", line 956, in _find_and_load_unlocked
ImportError: No module named 'lib.models.{model_name}'

I actually rectified it by changing a line in ./lib/models/init.py.
change:
model_path = "lib.models.{model_name}"
to:
model_path = "lib.models.{}".format(model_name)

And the codes start running. I just wanted to know if this is correct or is there any other solution.
Also, I am running this code on Python 3.5. Will that affect the functionality of the code?
Thanks. Any help appreciated.