Unittest modules import issue

Unittest modules import issue

I am unit testing a credit card validating program that accepts a .txt file containing fake credit cards numbers, and returns a dictionary of the card, whether it’s a valid credit card number, and the card type (visa, mastercard, etc.).

I am creating a test with unittest.mock.patch that looks something like this:

What’s the difference between

I have a Python class structure similar to the following example: