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· in this case it does work. In general, it probably doesnt. · the class template std::future provides a mechanism to access the result of asynchronous operations: Think of promise and future as creating a single-use channel for data. · this future feature is also missing in python 3. 6. Why isnt it back ported? Im wondering how this break in backwards … If i use annotations, they are … · the future statement is intended to ease migration to future versions of python that introduce … Promise creates the channel, and eventually …