Launch another python command without waiting for a return.

[DeaD_EyE]

You're calling the function talk directly and the return value of talk is called by executor, but the returned str is not callable. The executor needs to call the function. The name of a function is the reference to the function object living in memory. You can use also function as arguments.

This will fix your code.

future = executor.submit(talk, 'This will be, a long text for testing purpose.')

Function signature of Executor.submit
Function signature of threading.Thread


Very simplified the executor.submit looks like this:

def submit(function, *args, **kwargs):
    return fuction(*args, **kwargs)

The function submit calls the supplied function with arguments and keyword arguments.