I have the following use case, where I would like to create a sort of Python "template" function with types known upfront. In C++ side, I have a A::create<T>() method that takes a class, creates it ...

If so then vim-python-function-expander is here for you. First, write our your function/class/callable object, put your cursor inside of the () s, and press Tab. vim-python-function-expander will ...