M4N asks:. Is there a reason why functions in most(?) programming languages are designed to support any number of input parameters but only one return value?

When you run the Python interpreter, the main environment context is stored in the __main__ module's namespace dictionary. ... you could make the function call as PyObject_CallFunction(expression, ...

A normal Python function, when ... a loop, the function will start to run. However, each time the generator function encounters a yield statement, it will return the value to the loop ... way, the ...