Now as a student I have Mathematica license and use it a lot recently. Once I go to work, I can buy a license myself. However, I heard that some companies want to use Python only and some companies even don't allow to install Mathematica anymore. For now I don't have any experience with Python and read that it's totally different with Python. So my question is would learning Mathematica is still helpful if I cannot use it later when I go to work? I understand that I can use it for now but thinking that I would have to throw it completely and learning a completely new programming language makes me feel bad. What if I use Python later in my work, would it be easier to do switch from Mathematica to Python or should I still like a beginner and learn everything from beginning as a Python learner?

EDIT: assume that I work as an engineer (EE) but still still do a lot of calculation like solving equations and ploting graphs.