ModuleNotFoundError после успешной установки sudo pip

Question

Я пытаюсь загрузить библиотеки для python 3. Запуск только pip install pycrypto или любой другой библиотеки, которая еще не установлена, приводит к огромной ошибке

, о которой я писал в другом Q: Использование pip для установкиБиблиотека pycrypto на Mac

Использование sudo говорит, что библиотека успешно установлена, но я все равно получаю ModuleNotFoundError при запуске моей программы.(Я использую MacOS High Sierra)

$ sudo pip install pycrypto
Password:
The directory '/Users/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting pycrypto
  Downloading https://files.pythonhosted.org/packages/60/db/645aa9af249f059cc3a368b118de33889219e0362141e75d4eaf6f80f163/pycrypto-2.6.1.tar.gz (446kB)
    100% |████████████████████████████████| 450kB 2.3MB/s 
Installing collected packages: pycrypto
  Running setup.py install for pycrypto ... done
Successfully installed pycrypto-2.6.1
You are using pip version 9.0.1, however version 18.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

$ python ./assignment1.py 
Traceback (most recent call last):
  File "./assignment1.py", line 3, in <module>
    import pycrypto
ModuleNotFoundError: No module named 'pycrypto'