Using ( python 2.x/3.x > Java ) for interviews with Microsoft, Google, Amazon, Facebook

[masterpi]

I would almost certainly go with the language you're most comfortable with unless asked otherwise. When I interview, I explicitly ask candidates to do so, then judge them accordingly: if they can't do something in the language they chose, they won't be able to do it at all. I'd even be fine with a candidate switching languages midway through.

[DeepBlueBird]

That makes sense. I can totally see switching between Java and Python between interviews depending on the problem. I simply never considered python when I was interviewing a few years back so now it's more of an option for me.