I use Python for work, for my startup, and for my personal projects. In the same capacity I use JavaScript when doing web development. I even use VB6 for legacy

I use Python for work, for my startup, and for my personal projects. In the same capacity I use JavaScript when doing web development. I even use VB6 for legacy code upkeep at the day job. I like to use C++ for certain projects and I've had to pick up Java for Hadoop's MapReduce (which I use for my startup). It's always good to use the right tool for the job.