The answer if I understand correctly is if you want to use testing frameworks in Python, you should probably not be using global variables and you should probably actually be using the Singleton pattern.
The answer if I understand correctly is if you want to use testing frameworks in Python, you should probably not be using global variables and you should probably actually be using the Singleton pattern.
Python test frameworks generally do mocking by monkey-patching, and they take care of it for you. This does not generally require global state, either in the form of module-level variables or singletons. It works by doing things like replacing the attributes of an existing class or module object. (Python takes "everything is an object" seriously, so a module is an object whose attributes are the functions, classes and other global variables of the corresponding file's code, roughly speaking. It is not simply reflected as such through a reflection API, like in Java; it is directly represented with an object. This is the sort of benefit dynamic typing gets you, along with the object-qua-dictionary-of-attributes model.)