Not at all, in fact in a lot of places Python is taught first. Best advice would be to pick one language and learn it thoroughly. Later on learning your next language will not be so difficult as you'll find a lot of the concepts are shared, so you can build upon what you know and just look for the differences. Your third language will be even easier again as you have a bigger 'toolbox', so to speak, to draw on yet again. And so on.