how to make sure an input is from the wanted type

[astral_travel]

rob101 - i think that in the thread you directed me to - the question was different, and the code there is obviously much more simpler and less well written...

deanhystad - thank you for the answer, i have PyCharm Community, but i don't know exactly what to do - do i simply put on the red dot on the left side and run the debug, i really haven't tried before what you suggest

i really am not trying to get easy answers, sometimes i just don't know, but i look up in different websites to find answers, it's only when i haven't found an answer elsewhere is when i ask here for clarifications...