Julia? Now you're just making me laugh. Julia has a lot of potential but won't even begin to scratch Python for about 5 more years. Scientific programming is very very addicted to its tools. There is a reason even SciPy (for Python) is compiled Fortan (yes Fortan!) code. R is king for data science and the only reason it lost ground to Python is that R is a one trick pony compared to jack of all trades Python.